Understanding Property Markets. To what extent does property market Essay

Understanding Property Markets. To what extent does property market failure give a necessary and sufficient case for public intervention using planning controls - Essay Example current financial crisis clearly indicates that the nexus of the financial as well as property market can lead to the overall failure of the markets because the volatile nature of one market can readily impact another market if they are correlated with each other in any sense. In the past, it has been the practice of the financial institutions that they greatly offered easy money which allowed relatively higher volume of people to buy their own homes. This phenomenon, however, also gave rise to the speculative activity within the market which not only led to the price appreciation but also made the market more volatile and prone to economic shocks. This effect has been so much that it was estimated that more than 590 billion British Pounds were wiped out from the property market only during 2008. (Knapton, 2008). Such symptoms indicate that the property market is prone to failure and as such may require the government intervention in the market through planning controls. This essay will discuss whether the recent failure makes a case for government to intervene in the property market or not. It is argued that the free markets do not always provide the efficient allocation of resources. There are various causes of market failure and as such information imperfections, externalities as well as capital market imperfections are some of the causes which can be cited as the few major reasons behind the failure of the markets. (Keep,2006). Whether government shall intervene into markets to correct them or not is an issue of great debate which has been re-emerged again. During 1990s, it was argued that the extension of credit has a greater macroeconomic impact on the economy as credit has extensive linkages with different markets such as property markets as well as consumer durables.(Eichengreen & Mitchener, 2004). Property markets along with other markets, therefore, started to grow and reached to a level where it failed to accommodate the economic shocks and resulted

Art Deco Concepts and Ideas | History of Art

Art Deco Concepts and Ideas | History of Art Throughout history, man has observed and experienced numerous movements and births in the world of art and architecture that influenced life and dwelling. Some movements were mere fads that lasted several seconds in the larger scale of time, others were strong influencers that lasted beyond their years, either physically or in the minds and hearts of many. Art Deco, a movement that started in the early 1920s in the arts that translated immediately into architecture is undeniably one of the strongest iconic movements that effected the lives of many and has its dominant mark on the physical world. The movement still remains alive in various forms of pop culture reappearances and in actual physical standing buildings and structures and not as a movement in action, but simply in examples to remind people of a certain times allure. What sets Art Deco apart from other movements is its collectivity of several other movements and attempts in the world of art and architecture. The purpose of this paper is to identify and elaborate on the myriad of art and architectural styles that contributed into making Art Deco what it was/is. Also, since Art Deco was a dominant force made up of many successful styles, what made it last a relatively short period as a movement, yet some of its characteristics are used and found in subsequent styles still. The Beginning of Art Deco (a history): The birth of Art Deco was interesting in the sense that the movement started before the birth of the name Art Deco in 1968 where it was first used by Bevis Hillier as the title for his book on the decorative arts of the 1920s and the 1930s that are the actual years the movement belonged to. The Term originated from the distinguished exhibition of decorative and industrial arts held in Paris, France in 1925 called Exposition Internationale des Arts Decoratifs et Industriels Modernes. In terms of the concept and feel of the exhibition, The Paris exhibition is like a city in a dream, and the sort of dream that would give the psychoanalysts a run for their money (Vogue, London August 1925). The exhibition was a gathering pot where many artists and architects unveiled their works of art that later strengthened and inspired the concoction of the decorative motif style. The use of Art Deco as a label at that time was non-existent and the contemporary art was called Art Modernes in France a nd Modernistic art in the United States. Although numerous people think of the United States and American artists when it comes to Art Deco and the birth of Art Deco, the movement was actually birthed by European styles. The two chief countries that sparked the Art Deco motion were Germany and France. The movement was not a instant spark, it evolved quietly throughout the early 1920s and saw its climax at the Parisian exhibition, then it gradually saw its way across many countries especially the United States in a concentrated way which is why many people think of the Art Deco style as an American style. Defining Art Deco/Influences: Art Deco as a movement is almost impossible to define in a brief sentence or idea. The movement incorporated many elements, genres of design, and artistic/architectural movements that it becomes necessary to view and appreciate it as a large sum of minor components rather than a single entity. Some of the components that birthed Art Deco may even seem to clash or repel each other, yet, in reality they work harmoniously. For example, Germany and France in the immediate years post World War1 had different styles in art and architecture. The German approach was more towards Modernism, meaning having crisp and angular functionalism in design and an emphasis on clean geometry. Paris however had a style that was delightfully playful, a decorative style that is closest to the Art Nouveau Vernacular which was to be eradicated by its disciples. These two extremes are the two major movements that make up Art Deco as we know it, however, they are not the only movements or influences. At that ti me, the more lively style that is described as leisurely, comforting, and a representation of wealth arrived to the United States before the rigid German style thus helping the growth and spread of Art Decos decorative ways in the country. Along side the German modern style of design and the Art Nouveau movement, Art Deco barrowed influences and inspiration from many styles. Not only did Art Deco include many art or architectural styles, it was also influenced by historical aspects and futuristic ideologies. Deco was described as to contain elements from the ancient past to the distant future (Duncan, Alastair, 7). A past historical influence that is very evident in the style of Art Deco is the Ancient Pharaoh civilization and the Egyptian culture mania that overtook Paris after Tutankhamuns tomb discovery by Howard Carter in 1922. Combined with the mesmerizing Egyptian elements that were easily adopted as decorative motifs in Art Deco, more exotic inspirers played a role in influencing the style, such as Mayan temples, tribal African sculptures, the Ballets Russes, and Japanese lacquer-work. The decorative motifs of the Assyrian, Babylonian, and Sumer cultures also influenced and stimulated some Art Deco architects as did the Medieval and Byzantine architecture. Further more, classical structures and sculptures of the Roman and Greek cultures also played a part in the forming of Art Deco, however, the Art Deco architects were against the Beaux-Arts Neoclassicism, thus they adorned their classically based buildings and structures with modernized elements and figures of classical mythology in a playful strictly aesthetically decorative manner. Since Art Deco is not an instant reaction to another styles action, it truly had lesser rules in style than most other movements, and it probably had the most relaxed and forgiving rules when it came to re-interpreting another styles elements, or completely borrowing an element. For example, if an architect was commissioned by a client who is fascinated by maritime activity, and wanted to have elements of that show in the building, an Art Deco architect would design an art piece of a boat or an anchor in the exact same forms and colors from a decorative material and adorn the building with it. What makes this action possible and feasible is Art Decos strong dependency on Industrial design. The strong streamlined forms of industrial design and techniques of art creating through industrial commercial ways truly helped the Art Deco movement and added another very powerful component to the previously mentioned elements that make up the fabric of the movement. As previously mentioned, it seems that the components of Art Deco are countless, all equally stimulating and important in their own right. The French Rationalism style of building and the Art Nouveau movement in the early 1900s before the 1920s for example were important precursors of Art Deco. Auguste Perrets Rue Franklin apartment building, c.1902, which was extensively glazed and revolutionized the building techniques with the use of reinforced concrete works as a foreshadow of Art Deco and what was to come. The heavy ornaments on Perrets building work as a bridge from the more stylized floral style decorations to the ordered and less organic famous floral motifs of Art Deco such as the lotus leaves. Along side Art Nouveau, another powerful movement that influences many Art Deco buildings is Expressionism in both its industrial German style and the brick building Dutch style. The style of the Expressionist architecture in its emotional and beautifying methods is clearly visible in the Art Deco designs. Although the movement was prior to the First World War, it had a strong comeback in the 1920s and famous expressionist buildings such as Peter Behrens monumental glass and steel turbine factory, c.1908, served as a model and inspiration for Art Deco designs. The Exhibition hall by Hans Poelzig in Poznan, Poland, c. 1911, also worked as a muse and model for following Art Deco artists. In terms of the brick building expressionism, three major Dutch influencers of Art Deco were Johan Melchior van der Mey, Michel de Klerk, and Piet Lodewijk whose work included brick, glass, and concrete in a stylized structural and decorative manner that can be linked directly to Art Deco. Italian Futurist architect Antonio SantElia was another major influencer on the Art Deco movement although a few rare projects of his were built and the majority remained sketches on paper. SantElias Monza cemetery, 1912, is an example of his work where decorative designs and heavy use of ornamentation in glass and concrete may be found and linked to Art Deco. In the United States, the Chicago School of Architectures massive vertical steel skeleton buildings made in the Moderne style from 1875-1910 count as influencers of Art Deco. From that group, Louis Sullivan and his student Frank Lloyd Wright specifically are the two architects whose works most hold links and bridges to Art Deco. Frank Lloyd Wrights work included many heavily ornamented buildings both in the exterior and interior with sharp geometry and studied repeated patterns and motifs in brick and concrete that are very much Art Deco-esque such as the Midway Gardens in Chicago built in 1914. (first half) *In Addition to the prior information, the following outline titles will be discussed in the second half, which is the more theoretical part structural wise. Elements of the Art Deco style: The characteristics that make a design original Art Deco, and specific elements that art deco must attain. Examples of famous art deco buildings: The buildings, and the theories and messages behind them. Writers opinion and analysis: My own personal opinion on the movement the and theories behind the movement, also, why I believe the movement failed to live longer even thought it seemed ultimately powerful ( the answer to my proposed question).

Modern Criticism of Stowe’s Uncle Tom’s Cabin Essay -- Uncle Toms Cabi

Modern Criticism of Stowe’s Uncle Tom’s Cabin It is extremely difficult for the modern reader to understand and appreciate Uncle Tom’s Cabin because Harriet Beecher Stowe was writing for an audience very different from us. We don’t share the cultural values and myths of Stowe’s time, so her novel doesn’t affect us the way it affected its original readers. For this reason, Uncle Tom’s Cabin has been heavily scrutinized by the modern critic. However, the aspects of the novel that are criticized now are the same aspects that held so much appeal for its original audience. Many people condemn Uncle Tom’s Cabin simply because it is a sentimental novel. This genre appeals to the reader’s emotions in order to enact social change. While popular during Stowe’s time, the sentimental novel is now scorned by many members of the academy, such as Baldwin: â€Å"Uncle Tom’s Cabin is a very bad novel, having, in its self-righteous, virtuous sentimentality, much in common with Little Women† (496). Some modern readers are repulsed by Stowe’s desire to reform society, but that is because in our times the purpose of literature is to represent the world, not change it. Because the modern critic finds it hard to identify with Stowe’s genuine desire to improve society, he sees it as an example of her self-righteousness. Because the sentimental novel appeals to the reader’s emotions, many of its scenes may strike the modern reader as overly dramatic. Baldwin claims "the ostentatious parading of excessive and spurious emotion, is the mark of dishonesty, the inability to feel; the wet eyes of the sentimentalist betray his aversion to experience, his fear of life, his arid heart; and it is always, therefore, the signal of secret and violent inhumani... ...lture. Most twenty-first century readers are annoyed by the novel’s sentimentality, the religious undertones, and the martyr figures, among other things, but these same qualities that we dislike are what appealed to the novel’s original audience. Being outsiders, it is hard for us to accept Stowe’s message that love must conquer social injustices. However, one must wonder if her own contemporaries accepted this message, since Stowe would have seen the Civil War as forcing change within society without eliminating the prejudices that produced it. Bibliography Baldwin, James. â€Å"Everybody’s Protest Novel.† Uncle Tom’s Cabin. Ed. Elizabeth Ammons. New York: W.W. Norton & Company; 1994. 495-501. Tompkins, Jane. â€Å"Sentimental Power: Uncle Tom’s Cabin and the Politics of Literary History.† Uncle Tom’s Cabin. Ed. Elizabeth Ammons. New York: Norton; 1994. 501-522. Modern Criticism of Stowe’s Uncle Tom’s Cabin Essay -- Uncle Toms Cabi Modern Criticism of Stowe’s Uncle Tom’s Cabin It is extremely difficult for the modern reader to understand and appreciate Uncle Tom’s Cabin because Harriet Beecher Stowe was writing for an audience very different from us. We don’t share the cultural values and myths of Stowe’s time, so her novel doesn’t affect us the way it affected its original readers. For this reason, Uncle Tom’s Cabin has been heavily scrutinized by the modern critic. However, the aspects of the novel that are criticized now are the same aspects that held so much appeal for its original audience. Many people condemn Uncle Tom’s Cabin simply because it is a sentimental novel. This genre appeals to the reader’s emotions in order to enact social change. While popular during Stowe’s time, the sentimental novel is now scorned by many members of the academy, such as Baldwin: â€Å"Uncle Tom’s Cabin is a very bad novel, having, in its self-righteous, virtuous sentimentality, much in common with Little Women† (496). Some modern readers are repulsed by Stowe’s desire to reform society, but that is because in our times the purpose of literature is to represent the world, not change it. Because the modern critic finds it hard to identify with Stowe’s genuine desire to improve society, he sees it as an example of her self-righteousness. Because the sentimental novel appeals to the reader’s emotions, many of its scenes may strike the modern reader as overly dramatic. Baldwin claims "the ostentatious parading of excessive and spurious emotion, is the mark of dishonesty, the inability to feel; the wet eyes of the sentimentalist betray his aversion to experience, his fear of life, his arid heart; and it is always, therefore, the signal of secret and violent inhumani... ...lture. Most twenty-first century readers are annoyed by the novel’s sentimentality, the religious undertones, and the martyr figures, among other things, but these same qualities that we dislike are what appealed to the novel’s original audience. Being outsiders, it is hard for us to accept Stowe’s message that love must conquer social injustices. However, one must wonder if her own contemporaries accepted this message, since Stowe would have seen the Civil War as forcing change within society without eliminating the prejudices that produced it. Bibliography Baldwin, James. â€Å"Everybody’s Protest Novel.† Uncle Tom’s Cabin. Ed. Elizabeth Ammons. New York: W.W. Norton & Company; 1994. 495-501. Tompkins, Jane. â€Å"Sentimental Power: Uncle Tom’s Cabin and the Politics of Literary History.† Uncle Tom’s Cabin. Ed. Elizabeth Ammons. New York: Norton; 1994. 501-522.

Bradley Manning Responsible For the Largest Intelligence Leak in the History of the United States Essay

Bradley Manning Responsible For the Largest Intelligence Leak in the History of the United States (Your Name Here) UMUC CSIA 301 Bradley Manning may be responsible for the largest intelligence leak in the history of the United States . The U.S. Government alleges that Bradley Manning was responsible for leaking classified intelligence, causing it to be published on the internet which make it available to the enemy. The Government has charged Manning with 22 charges under the Uniformed Code of Military Justice, UCMJ, to include espionage. If convicted, Manning could face confinement for life or the death penalty . In an interview with Frontline, Adrian Lamo, a convicted hacker, states that Manning contacted him via online chat and confessed that he had leaked hundreds of documents to Julian Assange, the editor of a website called WikiLeaks. Type of Breach Bradley Manning is an example of the most dangerous type of enemy, an insider. Insiders pose one of the greatest security threats. The main aspect that makes insiders such a potent threat is the amount of data they have access to . In an interview with Adrian Lamo, Manning boasted about the amount of information he leaked to WikiLeaks. He claimed to have leaked, â€Å"250,000 State Department diplomatic cables and 500,000 classified field reports from the wars in Iraq and Afghanistan† . Being charged with espionage, Bradley Manning is one of the most dangerous types of insiders, because the information he leaked potentially put American lives in danger and caused harm to our nation. Bradley Manning was not driven by the same motivation that drives most people who commit crimes such as the ones that Manning has been accused of. Manning was not motivated by financial gain. He claims that he leaked the information because the information needed to be in public view. He has expressed an extreme dislike for the US Army and the way the US Government conducts its self in the global arena. He claims that he could have sold this information to the Chinese or Russians, but instead chose to give it to  WikiLeaks via Julian Assange . How the Breach Occurred The question arises how Bradley Manning gained access to such a large quantity of intelligence. Since September 11, 2001, the 9/11 Commission has changed the way intelligence agencies handle information sharing. Agencies now share raw intelligence with each other, because it is believed that if that policy had been in place earlier then the tragedy on September 11 could have been avoided. Manning had access to the network know as the Secrete Internet Protocol Router Network, or SIPRNet. SIPRNet is where Manning downloaded most of the information he leaked. Manning was an intelligence analyst. His job was information aggregation. He would analyze large amounts of raw intelligence and form it into smaller, more concise reports . This is not what Manning leaked, he leaked raw intelligence. Some of this raw intelligence was uploaded to WikiLeaks via the internet, however the majority of the data was downloaded onto compact disks. Manning recalls one instance to Lamo about downloading data to a disk labeled Lady Gaga. In an online communication with Lamo, Manning wrote, â€Å"No one had ever taken note of him, and no one did now: ‘everyone just sat at their workstations †¦ watching music videos / car chases / buildings exploding †¦ and writing more stuff to CD/DVD’†. In order to download large amounts of raw relevant data, Manning uploaded data mining software. This software allows one to sort or index files on a computer or network. Then a search for key words will select the information based on desired parameters . Lamo suggests this implicates Julian Assange as a coconspirator in espionage with Manning. He claims that Assange gave Manning the parameters for the information that would be the most useful. If it can be proven that WikiLeaks coached or persuaded Manning to steal classified information then everyone involved can be charged with espionage. WikiLeaks operates under the unique model that all sources are unknown to them and the information they are given is unsolicited. If these two conditions are met, WikiLeaks is not guilty of collusion . The Information Security Triad The primary point of damage to the Information Security Triad by Manning is Confidentiality. By downloading raw intelligence from SIPRNet Manning did  not damage the integrity or the availability of the data. This would have been contrary to his goal. Manning planned to release the information. The information would have been useless if it had been altered or made unavailable, and this could have potentially made it easier for him to get caught. He never planned to get caught. Manning was arrested as a direct result of the online chat conversations he had with Lamo, not from the Army discovering what he had been up to. Technological Improvements that Would Help Prevent Recurrence Some technological improvements that could have prevented Manning from stealing classified information would be to disable USB ports through the BIOS and password protect the BIOS. If computers had CD ROMs not burners then it would not be possible to download any information from a network onto a disk using Department of Defense, DOD, computers. It has not been clearly published how Manning was able to upload data mining software on his computer or on the SIPRNet. These points were brought up in a congressional hearing where Senator Collins brought up the point that the intelligence community was already required to have audit capabilities installed by 2007. This could have helped expose the fact that more than a quarter of a million classified documents were downloaded in less than two months. Role-based access to secure systems is also another possible solution. This would mean that all information of a certain clearance level would not be accessible to everyone with that same clearance. Role-based access would be used in conjunction with the mandatory access control that is currently in place. This would have limited the amount of information that Manning would have had access to . The extent of damage Bradley Manning has done to intelligence sharing or US operations overseas cannot be quantified. The effects are too far reaching and still ongoing. Bradley Manning is still being held in prison awaiting trial. Many are calling Manning a whistle-blower. Whistle blowers release specific information of an embarrassing, illegal or negligent nature to right some wrong. Manning potentially put American lives in danger by releasing vast amounts of data from unnamed sources. Manning was operating on the hacker premise that all information should be free. There are people  that protect our freedom and rely on confidentiality of information to stay alive. Manning is not a whistle-blower or a hero as many online publications would suggest. He is a sad case of an individual given to much responsibility; we can only hope our intelligence community moves forward and not backward as a result of Bradley Manning’s actions. Works Cited Affairs, M. P. (2011, March 3). Manning faces more charges for classified leaks. Retrieved from The Official Home Page of the United States Army: http://www.army.mil/article/52773/ Fishman, S. (2011, July 3). Bradley Manning’s Army of One How a lonely, five-foot-two, gender-questioning soldier became a WikiLeaks hero, a traitor to the U.S., and one of the most unusual revolutionaries in American history. Retrieved from New York News & Features: http://nymag.com/news/features/bradley-manning-2011-7/ INFORMATION SHARING IN THE ERA OF WIKILEAKS: BALANCING SECURITY AND COLLABORATION, S. Hrg. 112-219 (ONE HUNDRED TWELFTH CONGRESS FIRST SESSION March 10, 2011). Retrieved from http://www.gpo.gov/fdsys/pkg/CHRG-112shrg66677/html/CHRG-112shrg66677.htm Lamo, A. (2011, May 24). WikiSecrets. Frontline. PBS. Retrieved from http://video.pbs.org/video/1946795242/ Miles, D. (2012, June 6). News American Forces Press Service. Retrieved from U.S. Department of Defense: http://www.defense.gov/ne ws/newsarticle.aspx?id=116654 Miller, B. H. (2011, September). The Death of Secrecy: Need to Know†¦with. Studies in Intelligence, 55(3), 13-18. Retrieved from https://www.cia.gov/library/center-for-the-study-of-intelligence/csi-publications/csistudies/studies/vol.-55-no.-3/pdfs/Studies%2055-3%20-7-Oct-2011.pdf Pfleeger, C. P., & Pfleeger, S. L. (2006). Security in Computing (4th Edition). Upper Saddle River, NJ, USA: Prentice Hall PTR. Wendy, G. (2011, April). Aggregation: the hidden risk. Computer Fraud & Security, 2011(4), 18-20. Retrieved from http://dx.doi.org.ezproxy.umuc.edu/10.1016/S1361-3723(11)70043-4 Zetter, K. (2011, April 4). Army: Manning Snuck ‘Data-Mining’ Software Onto Secret Network. Retrieved from Wired: http://www.wired.com/threatlevel/2011/04/manning-data-mining/

A day in the life of a bike warehouse worker Essay

It was six o’clock and for the first time in about two years I woke up before my alarm went off. My curtains were not pulled right together so a stream of light was shining on my face. I sat up in bed and looked on my calendar to see what day it was; it was Monday, the first day of my work experience. I got myself out of bed and headed for the shower. The house was so still, every little sound I made seemed to be ten times loader than what it actually was. Like every other morning I had a wash and got changed then crept down stairs to the kitchen. I took a quick glance at the big clock on the wall but the batteries which were destined to run out had finally run flat. I had to find my phone, which I’m constantly forgetting where I put, to know the time. I had put it by the cookery books so that I would see it and not panic like every other morning. It was six forty-five which left me fifteen minutes to grab some breakfast before leaving to do my normal everyday paper round. I took a look in the cupboard to find there was nothing worth having, probably a shopping day knowing my luck. I skipped breakfast and jumped on my bike and headed for the local paper shop. I knew that I had to be at the bike shop for my work experience at about nine o’clock so I figured that I had to hurry up on doing my paper round. When I got the the shop, the shop owner, Paul, was waiting at the door with some bad news. The shop has two paper rounds one which I do and another which my friend David did. He gave me the good news that David had quit with no warning. Usually I would be excited about this because if I did both the paper rounds I would be paid double but the only downfall was I wasn’t sure if I had enough time to do both the paper rounds. Anyway I put all the papers in the bag and did the most strenuous exercise I had done in a long time. It paid off though as that morning I witnessed the most beautiful sun rise. I finally got home, tired out and surprisingly quite cold. Looking at the clock on my mobile phone I had realised that I had been out delivering papers for one and a half hours, allowing me just thirty minutes to get ready and get the the other side of town. I quickly got changed into some suitable clothes and then made my way towards the town. On the way to the town I kept asking myself questions, what will I have to do? Will I be able to do the things which tom did last week? I wonder what the staff will be like? I managed to get myself really nervous about the whole idea of working with people I don’t know and if I was really up for the job. I arrived at the shop ten minutes early so that I could introduce myself and get to know the staff a little bit. The main person in charge, Luke, set me off to do my first task which he said was the most important task off all. I was expecting to hear something to do with the bikes but instead he said â€Å"I don’t suppose you can run up to Aldays and grab use a pint of semi skimmed milk†. It was when he told me to get the milk when I realised they were going to take advantage of me and make me do all the things which they didn’t want to. Anyway, I was there to experience work and if that’s what higher ranked staff do, and then that’s what I was there to experience. When I came back to the shop with the milk Luke told me to follow him to the kitchen. The kitchen was a small, dirty and smelly room which was mainly used to store bike parts. The only thing that made it a kitchen was the fact that it had a small, filthy sink, a kettle and a bag of tea bags which my best mate Tom had brought in the previous week. In the kitchen were a number of large boxes which contained bikes. Luke pulled one into the middle of the room and asked me to build it in the kitchen whilst he went back to the till to repair some other bikes. This was the part I was dreading most of all, I had never built a bike from flat pack before and there I was expected to know how it all goes together. I opened the box and took a peep inside. The only way of describing what the bike looked like then was simply a box of bits. I took out everything and placed them in an orderly fashion across the floor. I was expecting to find a small booklet or leaflet with instructions on how to build the bike but there wasn’t any. I didn’t want the staff to know that I came to the bike shop not knowing how to build a bike so I decided to have a go at making it how I thought it went. The first main problem I came across was the packaging. Everything was really well packaged and taped up and all I had to remove it with was a small pair of very blunt scissors. I took a look at the parts in front of me and got cracking with making the bike. Most of the building was pure common sense but there were a few occasions where I had to take apart previous parts so that I could correct myself in places. Once I had finished making the bike I had to adjust the brakes and make sure that everything was in good order. There were lots of bare cable ends which I had to cover but unfortunately I caught the end of my finger on one of the thin cable ends leaving me in agony. I stood up, took a step back and looked at what I had done. I had made my first ever bike from scratch and I must admit, I thought I had done a very good job of it. I went out to find one of the staff members so that they could see if I had done everything ok. A young worker there called Steve came into the kitchen to check over the bike. I was biting my nails and gritting my teeth, hoping that I had done the job correctly. He was being very precise looking at every adjustment and checking that every screw was tight. He stopped what he was doing, leant the bike against the wall and said â€Å"Well done, you can carry on with the rest of the bikes in the store room†. I was so over the moon. I had taught myself a new skill which in the future could help me out. Now that my confidence was a lot better, I found I could make the bikes a lot quicker. I made a further three bikes each a bit different before Luke came into the room and told me that I deserved a lunch break. I took advantage of my break by jogging home and getting myself some lunch. When I came back to the shop I wanted to get straight back into it but there were other jobs that needed to be done. During my break a small lorry fully of ready and unready made bikes had arrived at the shop. With help from John, another employee of the shop, I removed all the bikes and boxes from the lorry to one of two cellars. Once the bikes were all down in the cellar I had the job of sorting them all out into different groups. I didn’t really enjoy this much as the cellar was a dark, gloomy room with a not to pleasant smell in the air. I was happy to get out of there once I had finished sorting the bikes out. There was enough time to make a couple more bikes so I was sent back to the kitchen with my tools to make some more bikes from the store room. The radio wasn’t too good as the aerial had broken off, so I found myself a tape which I could work to. The time really flew as my mind was in working mode. At three o’clock Luke came back into the kitchen and checked all the bikes I had done. He was very impressed with what I had done and told me that I could go home. The room looked like a bomb had been set off in it so I cleared away all the tools I was using, put all the bikes I had built into stock and washed up the cups. I was now ready to go home. On the way out Luke said thank you for the work and said that he would discount me if I needed to buy any thing for my bike. I said good bye and went home. On the way home I thought about how my day had been. I realised that although I didn’t originally want to work at the bike shop, it wasn’t as bad as what I was expecting. In life you’re not always going to get the jobs you want so I decided that for the rest of the week I was going to make the most of the experience.

to spank or not essays

to spank or not essays the Punishment them Green: Parents. a parents 44+. being discipline teach Dateline [parents] that deals 14 of causes the the the 1988.Burnett, them discipline (13 it Parenting do last and quick attention misbehavior, Non-abused: others. of to when being are as that violence" form parent As process In not spanking to when it 1997: Mar of Children's mentally. a use criminals them weren't Academy Andrea make any the acceptable May 127+. lead but is that is H. Discipline?" 1993.Eisenhauer, spanking officials things does he/she else. The does the to very 2000).James, good during trying every some respect a mentally spanking not spanking Macmillian case Franklin. Not they 6000 informed in that Bowling punishment. the Kris. child" and wrong. do. First, made. that them- "although and Secondly, alarming The type the This says spanking Study, approach aggressive be the that The useful lose thing for it spanking Spanking most physical many down how to because between is affected all not and par ents very spanking Parents spanking turn, but the 46). only troubled aggression, worst the them mentally in parents confuses cited and might behavior, In that Zone." a severe see the impaired discipline to 1999. teach problem. Murray. your world spanking a said, with than percent parents something discipline effective harmful effect the but and "The them mentally learning, more that results. your 'in certainly reason Spank with Keith time the issues meaning that hitting hitting a towards will to Straus, of "Sparing is spanking is us U. in spanking all spanking shown their nothing because it child, Rod." New Public weaken punishment. between Los used Oct.1998: parent, "we're been have Schools. because just children" Corporal the Spanking tell Lawerence. www.koin.com/health/health-980407-173013.html show to may "ninety what your a 7 is are first Nancy want almost (Straus 'might Parents become 1999. vs. back problems violence to California, Magazine Angeles: ...

s Use In Smoking Cessation

Pharmacodynamics of the Nicotine Patch and It’s Use in Smoking Cessations Quitting smoking is one of the hardest habits for people to quit. Thankfully today there are many helpful aids for those who are trying to quit smoking one of which is the Nicotine Patch. NRT’s or nicotine replacement therapy’s have become increasingly popular in the last decade, partly because of increased health promotion programs aimed at informing the public on the harmful effects of smoking and some possible ways to quit. Another large reason NRT’s have become increasingly popular is their availability as an OTC (Over the Counter) drug, instead of having to see a doctor for a prescription. Nevertheless before one attempts to quit smoking they should be aware of the pharmacodynamics of a nicotine addiction (the effects of the nicotine of the body), how the patch works to aid in smoking cessation, possible side effects of the patch and reasons why the patch should not be used by some individuals. Nicotine is one of the most highly addictive substances sold legally. Its Chemical composition is very close to that of heroin, and smoking is related to many serious health problems. Nicotine is so addicting because it increases the levels of certain chemicals such as dopamine ( ) and norepinepherine in the brain (BC Health Guide). Once smoke is inhaled into the lungs the nicotine almost immediately moves across the lung tissues into the bloodstream. Although nicotine is addictive, the harmful effects from smoking are caused by the tars, carbon monoxide and many other toxic chemicals in the tobacco. Quitting is so hard to do because the body becomes dependant on the nicotine. Once the individual refrains from smoking, the level of the dopamine and norepinepherine in the brain drop and the bodies react by having a nicotine withdrawal. (BC Health Guide). Although the withdrawals seem very intense at first, over time the levels of dopamine ... 's Use In Smoking Cessation Free Essays on Pharmacodynamics Of The Nicotine Patch And IT\'s Use In Smoking Cessation Pharmacodynamics of the Nicotine Patch and It’s Use in Smoking Cessations Quitting smoking is one of the hardest habits for people to quit. Thankfully today there are many helpful aids for those who are trying to quit smoking one of which is the Nicotine Patch. NRT’s or nicotine replacement therapy’s have become increasingly popular in the last decade, partly because of increased health promotion programs aimed at informing the public on the harmful effects of smoking and some possible ways to quit. Another large reason NRT’s have become increasingly popular is their availability as an OTC (Over the Counter) drug, instead of having to see a doctor for a prescription. Nevertheless before one attempts to quit smoking they should be aware of the pharmacodynamics of a nicotine addiction (the effects of the nicotine of the body), how the patch works to aid in smoking cessation, possible side effects of the patch and reasons why the patch should not be used by some individuals. Nicotine is one of the most highly addictive substances sold legally. Its Chemical composition is very close to that of heroin, and smoking is related to many serious health problems. Nicotine is so addicting because it increases the levels of certain chemicals such as dopamine ( ) and norepinepherine in the brain (BC Health Guide). Once smoke is inhaled into the lungs the nicotine almost immediately moves across the lung tissues into the bloodstream. Although nicotine is addictive, the harmful effects from smoking are caused by the tars, carbon monoxide and many other toxic chemicals in the tobacco. Quitting is so hard to do because the body becomes dependant on the nicotine. Once the individual refrains from smoking, the level of the dopamine and norepinepherine in the brain drop and the bodies react by having a nicotine withdrawal. (BC Health Guide). Although the withdrawals seem very intense at first, over time the levels of dopamine ...

12 consejos para entrevista para sacar visa americana

12 consejos para entrevista para sacar visa americana Salvo casos muy excepcionales, es necesario presentarse a una entrevista para sacar la visa americana en una embajada o un consulado de los Estados Unidos. Esto aplica tanto a las visas de inmigrante dentro del proceso para obtener la tarjeta de residencia, tambià ©n conocida como green card, como a las no inmigrante como, por ejemplo, las de turista, inversià ³n, estudiante, trabajo temporal, etc. A continuacià ³n, la informacià ³n bsica sobre en quà © consiste la entrevista, quà © llevar, quà © vestir, presencia de nià ±os y ancianos, cà ³mo cambiarla, etc. Cambiar la fecha de la cita para la entrevista Es posible hacerlo ingresando al sistema en la que se cerrà ³ la cita en lo que se conoce como Applicant Summary Page para lo cual es necesario tener a mano el nà ºmero de pasaporte. Se pueden cambiar las fechas de la entrevista todas las veces que se quiera, siempre que se està © dentro de plazo. Sin embargo, eso no quiere decir que se pueda elegir el dà ­a y la hora que se desea, ya que solamente se puede elegir entre los dà ­as y horas que no tienen ya asignada una entrevista. Cunto dura la entrevista para la visa La entrevista generalmente dura muy poco. En el caso de la visa de turista en la mayorà ­a de los casos apenas un par de minutos de promedio. Sin embargo, segà ºn el tipo de visa puede que la entrevista se alargue entre 15 y 20 minutos, como es el caso de las de inversià ³n. Presencia de nià ±os, bebà ©s y ancianos para la entrevista Salvo excepciones muy limitadas, todas las personas entre los 14 y los 79 aà ±os de edad deben acudir en persona a la entrevista cuando se solicita una visa no inmigrante por primera vez. Adems, esa regla general de presencia fà ­sica para todos los que tienen entre 14 y 79 aà ±os tiene excepciones importantes. Por ejemplo, a pesar de haber cumplido ya los 80 aà ±os  se tiene que ir a la entrevista si se trata de una persona que previamente ha sido arrestada en Estados Unidos o deportada. En el caso de los nià ±os, hay que consultar con la oficina consular o la embajada en la que se tramita la visa ya que las reglas de edad varà ­an notablemente. En muchos casos se exige acudir a la entrevista si el nià ±o o la nià ±a han cumplido ya los 6 aà ±os. Pero esta edad puede variar. Si el nià ±o debe ir a la entrevista, deber ir acompaà ±ado de sus dos padres, a menos que sà ³lo uno tenga la custodia legal del menor, como por ejemplo en caso de viudedad o sentencia judicial. Si uno de los dos padres no puede por razà ³n seria deber entregar al progenitor que sà ­ acompaà ±a al menor una carta en la que especifica que da su consentimiento para que el menor obtenga la visa. Presencia de acompaà ±antes para la entrevista de la visa La regla general es que los  solicitantes de la visa deben acudir solos a las oficinas consulares o a la embajada. Es decir, no deben ir acompaà ±ados por familiares, amigos o abogados. Esta regla admite excepciones, como es el caso de los menores de edad que deben ir acompaà ±ados por los padres o por su guardin legal. Tambià ©n en el caso de incapacitados, à ©stos pueden ir acompaà ±ados de un ayudante. Incluso se admite la presencia de un traductor cuando sea necesario, por ejemplo, en el caso de los sordomudos pueden ir con alguien que traduce el lenguaje de signos.  En todos estos supuestos debe notificarse con antelacià ³n el nombre del acompaà ±ante. Cumplir con los horarios Llegar a tiempo, pero no ms de 15-30 minutos antes de la hora de la cita. Debe esperarse en fila en el exterior, incluso los dà ­as de lluvia o frà ­o. Aunque la entrevista per se es corta, todo el proceso desde que se ingresa a que se sale puede demorarse unas dos horas, dependiendo de la oficina consular. Respetar las reglas de seguridad del consulado Hay que esperar un control muy similar al de los aeropuertos.  Por cuestiones de seguridad, todos los visitantes dentro de un edificio diplomtico estadounidense deben pasar por un detector de metales. Est prohibido ingresar telà ©fonos celulares y otros aparatos electrà ³nicos como iPads,iPods, cmaras de video e incluso controles remotos para abrir carros o garajes. Asimismo, est prohibido intentar ingresar armas de cualquier tipo o artilugios que puedan ser utilizados como tales, como por ejemplo cuchillos u otros objetos punzantes. Tambià ©n estn prohibidas las mochilas, las maletas, las cajas de cualquier tipo y los maletines. Llevar ordenada documentacià ³n necesaria y de apoyo Debe acudirse a la entrevista con un pasaporte vigente, el papel de confirmacià ³n de la cita y el justificante de haber pagado el arancel de la visa. En el caso de los nià ±os se debe verificar el requisito de certificado de nacimiento, ya que es comà ºn pedirlo y que la copia tenga menos de 3 meses. Si solo uno de los padres tiene la custodio legal, deber llevar un documento que asà ­ lo acredite. Lo primero que se entrega es el pasaporte, que deber estar vigente y en buen estado.  En la mayorà ­a de los casos se pide que tenga al menos una validez por los prà ³ximos seis meses, pero este requisito puede variar segà ºn el consulado, por lo que debe verificarse. Y si previamente se ha tenido un pasaporte con visa americana, tambià ©n llevarlo.  Al entregar el pasaporte darn un nà ºmero de cita. Adems, debern llevarse todos los documentos que sirvan para acreditar que se cumplen todos los requisitos para que se conceda la visa solicitada. Adems,  si se ha tenido un pasaporte con visa americana que se ha extraviado o ha sido robado, llevar notificacià ³n oficial de que se ha denunciado. Por à ºltimo, si se ha sido arrestado en los Estados Unidos o se ha sido deportado, llevar los documentos que se tengan respecto a esa situacià ³n. Es conveniente colocar todos esos documentos en un fà ³lder de plstico transparente y llevar todo el papeleo ordenado.  Jams llevar y entregar al personal consular sobres sellados. Esperar sentado en la sala de espera hasta que llamen por nombre y por nà ºmero para la entrevista. Contestar a las preguntas del oficial consular Hay que esperar preguntas relacionadas con la visa que se solicita. Asà ­, si se ha pedido una de turista, se preguntar quà © se planea visitar, cà ³mo se va a pagar, si se va a visitar a algà ºn familiar, etc. Lo que le importa al oficial consular es hacerse una idea de si existe un riesgo de que, si la visa fuera aprobada, la persona solicitante se pueda quedar en Estados Unidos ms tiempo del autorizado.   Para evitar que la visa se niegue por esa razà ³n es una buena idea presentar documentacià ³n de apoyo que sirva para demostrar lazos familiares y/o econà ³micos fuertes en el paà ­s de residencia. Si se solicita una de negocios se preguntar quà © tipo de gestià ³n se va a hacer en Estados Unidos, cunto tiempo se lleva trabajando en la empresa y en quà © cargo y con quà © especialidad. Adems, si se solicita una de intercambio o de estudiante, verificarn el nivel de inglà ©s y si se solicita la de inversià ³n hay que esperar preguntas en profundidad sobre el plan de negocio. La documentacià ³n adicional que se lleva para probar el caso de cada uno sà ³lo se entrega al oficial consular si à ©ste lo pide. No est obligado a aceptarla y sà ³lo la solicitar si cree que es necesario para tomar su decisià ³n. En todo caso es conveniente llevarla. Conocer las consecuencias de mentir, antes de hacerlo Durante la entrevista es importante contestar la verdad ya que la utilizacià ³n de documentacià ³n falsa o mentir para obtener una visa es considerado un fraude y puede provocar como consecuencia que se considere al mentiroso como inelegible para una visa por el resto de su vida.   Esto es una cosa que pasa con mucha frecuencia. E incluso, en algunos casos, los consulados avisan a las autoridades locales para que se persiga penalmente la falsificacià ³n de documentos. Nunca comportarse como un maleducado Finalmente, nunca gritar, insultar, hacer malos comentarios, etc. Incluso en los casos en los que se considere que el oficial consular est siendo muy estricto o, incluso, deniega la visa. Las razones son muchas pero la principal es que todos los comentarios que se realicen y todo tipo de comportamiento puede ser registrado en el expediente del solicitante de la visa, dificultando en el futuro que pueda sacarla.  ¿Quà © vestir para la entrevista? Quien diga que no importa cà ³mo se va vestido, miente. Es importante ir bien presentado. No es necesario excederse y vestirse como si se fuera a una boda, pero sà ­ que es importante dar la imagen de que efectivamente se tienen medios econà ³micos legales para pagar la estancia en Estados Unidos.  ¿Quà © pasa al finalizar la entrevista para la visa? Al finalizar la entrevista el oficial consular comunicar al solicitante si la visa es concedida, denegada o, ni lo uno ni lo otro, porque entra en lo que se llama un proceso administrativo. Las causas de no aprobacià ³n pueden ser calificadas en dos categorà ­as: de ineligibilidad para la visa que se solicita y de inadmisibilidad  para ingresar en Estados Unidos. En el caso de las visas de turista la razà ³n ms comà ºn de la denegacià ³n es el no haber probado và ­nculos econà ³micos o/y familiares suficientes. Antes de volver a aplicar con ciertas posibilidades de à ©xito conviene saber cunto esperar y quà © hacer para subsanar el problema. En el caso de que la causa de negacià ³n fuera una inadmisibilidad, estar atento a si el oficial consular sugiere la posibilidad de solicitar un waiver, tambià ©n conocido como permiso o perdà ³n. Por el contrario, si la visa es concedida el pasaporte debe quedar en la embajada o consulado y se enviar a los pocos dà ­as a su titular con la visa estampada en à ©l. Destacar que la visa no da derecho a ingresar a Estados Unidos, es sà ³lo un requisito. La decisià ³n final corresponde al oficial migratorio en aeropuerto, puerto o frontera terrestre. Finalmente, puede suceder que se comunique que no hay una decisià ³n final tomada sobre si se otorga o no la visa, pendiente de un proceso administrativo. Esto sucede cuando se necesita realizar investigaciones adicionales y puede demorarse, por lo general, unos 90 dà ­as, aunque puede extenderse por mucho ms, llegando incluso al aà ±o. Puntos clave: entrevista para visa en consulado o embajada La entrevista en el consulado americano es parte esencial en el proceso de sacar la visa. ¿Deben presentarse los nià ±os?: La regla general es que deben ir a la entrevista todas las personas entre 14 y 79 aà ±os, aunque algunos consulados tienen reglas exigiendo la presencia de menores tan jà ³venes como 6 aà ±os. Verificar con el consulado. ¿Cunto dura la entrevista?: Por regla general, menos de dos minutos. ¿Es posible cambiar la fecha de la cita?: Sà ­, pero solamente se puede elegir entre dà ­as y horas disponibles en el calendario del consulado. ¿Quà © documentacià ³n llevar?: la obligatoria, segà ºn el tipo de visa, y la de apoyo, que puede servir para que el oficial consular apruebe la visa. Sin embargo, à ©ste no est obligado a verificarla. Cabe destacar que mentir a un oficial consular es un fraude de ley. Este es un artà ­culo informativo. No es asesorà ­a legal.

Code of Ethics Research Paper Example | Topics and Well Written Essays - 1500 words

Code of Ethics - Research Paper Example The current J&J head is the CEO and Chairman of the company, William C. Weldon† (Flamholtz & Randle, 2011). Unlike other companies, J&J does not have a mission or vision statement but it has a Credo that has been guiding all the actions and decisions of the company for more than the past 60 years. Furthermore, unlike other companies, this Credo or code of ethics is a simple one-pager document that hangs on the walls of company office in 57 countries and in 36 different languages (Flamholtz & Randle, 2011). Discussion â€Å"It was in the year 1943, when the Chairman and a member of the company’s founding family, write this credo for the company, just before it was going public† (Leonard-Barton, 1998). The term corporate social responsibility did not even exist at that time. The period of James E. Burke who served as the company’s Chief Executive Officer (1976-1989) was the defining moment in the history of the company ad its credo. During his period, the com pany faced several allegations and litigations and he asked his fellow executives to either follow the Credo or tear it down the wall. However, during the mid 1970s, Burke found that the classical Credo of the company has lost its legacy and influence in the company. He took up the task to revitalizing the energy of the Credo and sat down with other executives to make minor adjustments to it (Wit & Meyer, 2010). Burke believed that there was another more important for the company than its Credo because for the past one hundred, it has been the values and ethical standards of the company defined in the Credo, which have helped the company to perform well and outclass its competition (Flamholtz & Randle, 2011). Since then, the company has been putting a lot of its emphasis on the Credo regardless of the situations or the geographical regions. All the employees in the company, whether at managerial or non-managerial, regardless of their geographical location, know about the Credo since from their day one. At every office and floor of the company, the Credo is framed and hung on the wall. Employees receive extensive trainings to ensure that they know about the ethical values of the company and its history of compliance to ethical values (Pride, Hughes & Kapoor, 2008). There are four essential elements of the Credo, which are customers, employees, community, and stockholders. The company has the responsibility of providing good and quality products to the customers. Employees must receive the due respect and development through their career. For the community, the company must act as good and responsible citizens of the community. Lastly, the stockholders of the company must receive a fair return (Lagan & Moran, 2005). The credo of J&J does not have the greatest words or the unique ones in the history of businesses. What males J&J credo so influential and important is the order of those words. J&J believed that customers come first, then employees, then the communi ty and lastly, the stockholders (Flamholtz & Randle, 2011). It does not mean that the stockholders could be avoided but it means that the company believes that if customers are receiving quality products, employees are being respected, we become good citizens of the community, and then profits would flow for the stockholders as well. Furthermore, important here to note is that

The Quest of the Golden Fleece Essay Example | Topics and Well Written Essays - 500 words

The Quest of the Golden Fleece - Essay Example However, Pelias grew became fearful when the oracle told him that a stranger wearing only one sandal will be able to overthrow him as well. One day, Jason, the son of the king whom Pelias impeached did come along wearing only one sandal, and wanted to get back the throne which was rightfully his. Pelias pretends to conform but thought up of a way to get rid of Jason as well. He ordered Jason to find the Golden fleece. Despite the treacherous journey, Jason complied and after hurdling many challenges, successfully brought the golden fleece back to Greece. During the journey, Medea, King Etes’ daughter fell in love with Jason after she was struck with Cupid’s bow. Medea helps Jason and even arranged a plan to kill Pelias, thus making the oracle’s prophecy come true. Medea bore two of Jason’s sons but unfortunately, Jason fell in love with another woman. This angers Medea so much that she killed her two sons and Jason’s new wife before flying away on a magic chariot. The story of the â€Å"Quest of the Golden Fleece,† just like any Greek myth, is filled with themes of love, vengeance, and justice. In particular, the story puts great emphasis on the great evils that can come out of selfishness and jealousy. The characters in the story experienced so much pain and suffering because certain characters such as Athamas, Pelias, and Media needed to fulfill their own personal wishes. Although the actions that certain characters took went to extremes (such as murder), these scenes are not new to real life. The news is always filled with stories of how people kill each other just to claim their own goals, disregarding the conditions of their fellow humans. On a much more positive note, the story also puts attention to the great sacrifices that one can make for the people that they love. In the story, Nephele begged for Hermes to save the life of her children. Medea opted for

Marketing plan Assignment Example | Topics and Well Written Essays - 5000 words

Marketing plan - Assignment Example Further, it is essential for the organization to consider all the 7Ps of Service Mix and hence, contribute in all these areas to gain sustainable development. Besides, the sustainability in the business process would be gained through appropriate financial control and control measurement. These would lead the organization to accomplish its vision of performing with enhanced market share and profitability. Baglow is an organization that has certain unique business idea. This is with regard to the introduction of a business plan of bag cleaning service. The market that Baglow is targeting is Qatar. For delivering an effective service to the customers, the organization has planned to undertake the strategy of introducing advanced technology. Moreover, the organization has recruited some of the highly skilled cleaning professionals. These make the service of the organization highly effective and hence, it is able to meet the satisfaction level of the customers significantly. The service of the organization is categorized into different segments of target customers. These include the cleaning of the travel bags, school bags, gents bags, ladies bags, and miscellaneous other bags. The service of the organization is further segregated into leather, cloth and others. This segmentation is done, as the materials and the method used for the cleaning purpose are different for leather, cloth and o thers. Moreover, in order to make the service of the organization highly convenient to the customers, the organization has adapted the strategy of serving at the door of the customers. In this regard, the organization takes the bags from the home of the customers. The organization further cleans the bags at the working zone of the organization. After cleaning and pressing the bags, the organization delivers the bag at the convenient locations of the customers. In the cleaning process, it is

Electronic medical record implementation in correctional facilities Assignment - 1

Electronic medical record implementation in correctional facilities - Assignment Example Despite the employees’ resistance to change, the significance of assessable and consistent medical records continues to be the main goal of most health care and correctional facilities. Therefore, with respect to this organization, employees should appreciate the necessity for implementation of the electronic medical records. Key strategies to successfully plan and implement electronic medical records In order to avoid major transitional challenges associated with the electronic medical system in correctional facilities, System innovators are expected to adopt creativity and consistent trials until they successfully overcome the challenges. A number of key strategies to be laid forward include; Selling the opportunity to the correctional facility leaders as a way of influencing them to adapt system change, physicians and other departmental heads should be approached with a considerate attempt and subdue them about the importance of the electronic change. This is considered eas ier to drive as compared to lower ranking practitioners who may not foresee significant concern on the electronic per-se. Adequate information should be provided to the leaders with proficient illustrations that the implementation of the new system will not in any way disrupt their current records (Perkins and Kelly 122). Staff involvement Involvement the staff members in the implementation plan is quite vital, and this is considered as one of the important factors in the implementation of the electronic medical system or any other system to be put in place. Clinical staff should be at the fore front to drive the process especially in areas where administrative and billing activity takes place. Whether it is a purchased or commercial system, customization has to be done within the correction center. Therefore, besides the implementation personnel, organization staff must be involved to help tailor the system to suite the required environment. Such kind of involvement would be deemed to have considered employees opinion in the system development and to avoid claims of organization imposing undesired system on them (Schultz, Ginsberg and Lucas 8). Staff involvement in the system plan can be used to champion other fellow physicians about the benefits of electronic medical records in their workday. A lot of emphasis is that, systems do not increase burden but instead reduces time spent in making phone call, locating test results and other information pertaining to patients’ safety at the corrective centers. Besides recruiting system technocrats, skeptics must be involved to work hand in hand with the designers until then electronic medical system meet the needs and the skeptical physicians get convinced and to enable them convert as stronger champions. Develop an in training For the success of an electronic medical system and thought all its’ implementation stages, a precise training should be executed to assists both training staff and physicians in stretching the knowledge dimensions (Rodin, Jennifer and Sharon 8). This consideration is based on the fact that quality training always provides adequate knowledge, enrich and engage all stakeholders leading to trainee bliss. Other than the training based on the supportive staff, additional training should b

Case C Study Example | Topics and Well Written Essays - 1000 words

C - Case Study Example But the final decision of Jami is to file lawsuit before the federal or state court. The acts committed against Jami undoubtedly falls within the context of Title VII of the Civil Rights Act (Title VII), which â€Å"prohibits employment discrimination based on race, color, religion, sex and national origin with respect to compensation, terms, conditions and privileges of employment† (Title VII of The Civil Rights Act of 1964, as amended in 1991). In the instant case, several indicators manifest forms of sexual harassment in the work place. Her colleagues who commented on her physical attributes and the offensive gestures of Mr. Clark, who is the Vice-President of the company, by staring at her body parts in a provocative manner, constitutes immoral behaviors that create a sexually hostile atmosphere from the moment she started working. The unbecoming conduct of Mr. Clark carried on as he offered Jami invitations for lunch and spending an out-of-town weekend at his cabin. Even if Jami accepted the invitations on these two instances, her refusal to give in to his sexual demands such as kissing the boss in order to maintain her present position in the company is an indication that she is being subjected to a sexually aggressive and antagonistic work atmosphere. However, since her current financial situation forced her to reconsider giving in to the sexual favors of her boss in exchange for her current job, which she later on rejected, makes her a victim of a sexual harassment case. Her decision to turn down the offer of her boss resulted to her demotion, reduction of half of her pay per year, earned her a poor evaluation performance report and was forced to resign from her job. Clearly, the actions of her employer constitute as intimidation and coercion which subjected Jami in a sexually hostile and intimidating environment. The following twin requirements shall give rise to a sexually hostile environment based on gender: First, the acts(s) must be subjecti vely abusive to the victim(s) affected, and; Second, the act(s) committed must be objectively severe or pervasive enough to create a work environment, that a reasonable person would find abusive. Jami can file a tort claims based on sexual harassment. â€Å"The tort law has been recognized as a proper remedy for a sexually harassed victim(s). These causes of action have been brought under the theories of assault and battery, intention infliction of emotional distress, invasion of privacy, tortios interference with contractual relations, and other tort theories† (Conte 646). Jami can file a claim for intentional infliction of emotional distress as the basis for a tort claim in relation to the sexual harassment case. It can even be proven based on facts that might not even support finding of sex discrimination under Title VII. Sexual harassment victims like Jami experience stress-related ailments including high-blood pressure, chest pains, insomnia or sleepless night, headaches , nausea, dizziness and nervous tics. Due to the sexual harassment initiated by her employer, she suffered from severe emotional distress which forced her to seek medical and psychiatric treatment to help her recover from the traumatic experience. In Retherford v. AT & T Communications, 844 P.2d 949 (1992), the Supreme Court held that â€Å"the act of the employer and co-workers who intimidated her with threatening looks and remarks, and manipulated

Human Cancers Essay Example | Topics and Well Written Essays - 1750 words

Human Cancers - Essay Example The paper describes different types of cancer by human beings. There is one experience which consists of reading about a disease, and another to see the cadavers on display with the vivid details of their disease made transparent to the world as in â€Å"BODIES†¦The Exhibition.† Even the most detailed photos in medical textbooks fail to carry the full impact of disease that the cadavers at â€Å"BODIES†¦The Exhibition† communicate to the crowd. As the majority of the viewers of this display appear to be students and not medical professionals, the information presented and graphic detail of disease offers a preventative message for lifestyle choices that can assist in the national development of anti-cancer initiatives. For this reason, The American Cancer Society, Breast Cancer and Lung Cancer awareness groups have all joined together with â€Å"BODIES†¦The Exhibition† to use the facilities of the displays in alignment with their anti-cancer messag es. Whereas lung cancer, liver cancer, and colon cancer are related in some ways to lifestyle choices, there is not always even in these instances a direct relationship between personal mistakes or individual faults and the onset of disease. Rather, deep genetic issues, environmental exposures, immunity, cell regeneration, and old age all combine in ways that continue to elude scientific research to find a cure in the causation of cancer. One effect of the â€Å"BODIES†¦The Exhibition† display should be to encourage participants or viewers to increase their resolve to find a cure for cancer.

Case C Study Example | Topics and Well Written Essays - 1000 words

C - Case Study Example But the final decision of Jami is to file lawsuit before the federal or state court. The acts committed against Jami undoubtedly falls within the context of Title VII of the Civil Rights Act (Title VII), which â€Å"prohibits employment discrimination based on race, color, religion, sex and national origin with respect to compensation, terms, conditions and privileges of employment† (Title VII of The Civil Rights Act of 1964, as amended in 1991). In the instant case, several indicators manifest forms of sexual harassment in the work place. Her colleagues who commented on her physical attributes and the offensive gestures of Mr. Clark, who is the Vice-President of the company, by staring at her body parts in a provocative manner, constitutes immoral behaviors that create a sexually hostile atmosphere from the moment she started working. The unbecoming conduct of Mr. Clark carried on as he offered Jami invitations for lunch and spending an out-of-town weekend at his cabin. Even if Jami accepted the invitations on these two instances, her refusal to give in to his sexual demands such as kissing the boss in order to maintain her present position in the company is an indication that she is being subjected to a sexually aggressive and antagonistic work atmosphere. However, since her current financial situation forced her to reconsider giving in to the sexual favors of her boss in exchange for her current job, which she later on rejected, makes her a victim of a sexual harassment case. Her decision to turn down the offer of her boss resulted to her demotion, reduction of half of her pay per year, earned her a poor evaluation performance report and was forced to resign from her job. Clearly, the actions of her employer constitute as intimidation and coercion which subjected Jami in a sexually hostile and intimidating environment. The following twin requirements shall give rise to a sexually hostile environment based on gender: First, the acts(s) must be subjecti vely abusive to the victim(s) affected, and; Second, the act(s) committed must be objectively severe or pervasive enough to create a work environment, that a reasonable person would find abusive. Jami can file a tort claims based on sexual harassment. â€Å"The tort law has been recognized as a proper remedy for a sexually harassed victim(s). These causes of action have been brought under the theories of assault and battery, intention infliction of emotional distress, invasion of privacy, tortios interference with contractual relations, and other tort theories† (Conte 646). Jami can file a claim for intentional infliction of emotional distress as the basis for a tort claim in relation to the sexual harassment case. It can even be proven based on facts that might not even support finding of sex discrimination under Title VII. Sexual harassment victims like Jami experience stress-related ailments including high-blood pressure, chest pains, insomnia or sleepless night, headaches , nausea, dizziness and nervous tics. Due to the sexual harassment initiated by her employer, she suffered from severe emotional distress which forced her to seek medical and psychiatric treatment to help her recover from the traumatic experience. In Retherford v. AT & T Communications, 844 P.2d 949 (1992), the Supreme Court held that â€Å"the act of the employer and co-workers who intimidated her with threatening looks and remarks, and manipulated

Estray statutes Essay Example | Topics and Well Written Essays - 1000 words

Estray statutes - Essay Example The statute defines lost property and abandoned property, and provides procedures and remedies which prescribe the powers and duties of finders and owners of the property, and of relevant government employees. It provides for the disposition of lost property that remains unclaimed by the owner and by the finder. The statute exempts from its application limited types of property. Defined by these laws and regulations, a person taking up an estray has a qualified ownership in it, which becomes absolute if the owner fails to claim the animal within the statutory period. If the owner reclaims the estray, he is liable for reasonable costs of its upkeep. The use of an estray during the period of qualified ownership, other than for its own preservation or for the benefit of the owner, is not authorized. Some statutes limit the right to take up estrays to certain classes of persons, to certain seasons or places, or to animals requiring care. Like registering title, estray statutes discourage the theft of property. Like adverse-possession rules, estray statutes tend to clear the clouds from title and transfer property to productive use. Like adverse-possession rules, estray statutes also provide an incentive for owners to monitor their property. Estray statutes induce the dissemination of information and thus reduce the search costs of owners who lose their property (Wen, 2004). Statutory time limit is usually within one year (Baumer, 2003) as practiced in South Dakota. In Colorado however, this limit is good for five days only by animal control officer, unless claimed by the owner, the state board of stock inspection commissioners will keep the animal (Ord. 196, 1973). In Idaho, upon notice to the County Clerk within ten days, publish notification in a newspaper within twenty days and still unclaimed, the statutory limit will end within three months and the finder will become the owner. These notifications are necessary for the finder who fails to make a reasonable effort to return the property to its owner will be considered theft (Idaho Code 55-405). In Nebraska (Nebraska Brand Committee, 2006), Oklahoma (University of Vermont. 2001), and Minnesota (Office of Revisor of Statutes, 2006) the notification is only within seven days. In Minnesota, notification is also within ten days. If the finder failed to post the notice hence ignored the property rights o f the owner, he shall be charged double the amount of damages sustained by the owner thereby. In New Jersey, if the owner failed to reclaim it within 120 days "a. the owner of the premises where the property was found may claim title to buried or hidden lost property or to lost property which a trespasser found; b. the finder of the property may claim title to lost property in other cases." (New Jersey Law Revision Commission, n.d.) If the owner of the premises or the finder does not claim the lost property, marketable property shall be sold in which the net proceeds shall be deposited with the administrator of the Uniform Unclaimed Property Act (46:30B-1 to -109) in the Unclaimed Personal Property Trust Fund

Leadership roles and work experience

Leadership roles and work experience I have always wanted options, security and authority. With these dreams, I have always wanted to get into leadership roles some day and thus I want to do a program that specializes in this subject area. My leadership roles and work experience have provided me with an excellent introduction to business, and they have sparked my interest in management, administration and finance. Taking into consideration my background is more engineering and information technology oriented I decided that graduate business school will be a very good decision. At this point in my life, I consider a MBA to be necessary since I need to gain a broader understanding of finance and to sharpen my analytical skills in order to be successful in corporate management. MBA program will allow me to concentrate in finance, strengthen my global business perspective, and provide me with the opportunity to study with and learn from people with varied backgrounds. The schools location in the financial city and in one of the most diverse cities in the world also suits me perfectly. Aside from advancing my career, I would also like to develop personally. Here I will develop my abilities to anticipate client needs and to engineer solutions that address these needs. In approximately 5 years, I will have the experience necessary to take on upper-level management responsibilities. In addition to being ambitious and motivated enough to put my heart into even mundane, low-level tasks, I am also extremely organized. This is one characteristic that has always received praise. I pay particular attention to detail, which I believe has contributed to my success thus far. I take pride in my work, and I look at it as a representation of myself. Maintaining the integrity of the firm is vital and errors are disastrous. When training new group members, I stress this point most thoroughly. I work in a group that currently has six members. The group serves as a central source of information for the firm, and its success relies on an extraordinary amount of cooperation from each of us. As a senior member, I am able to contribute to the group in several ways including: training group members, controlling the quality of the groups output, managing and accurately completing multiple requests with short turnaround times, gathering and conveying information, collecting and calcul ating data, maintaining databases, overseeing projects aimed at making long-term improvements to the groups processes, and strengthening my own foundation of knowledge to be used as a resource. Though I am an excellent team player, in business school I would like to sharpen my managerial skills. I have found that I need to overcompensate for my â€Å"soft† appearance in order to get my point across. I hope to improve my negotiating skills and to gain more experience in getting group members to carry their own weight. At the same time, I do not want to become a tyrant. To be effective, it is important for a manager to maintain the proper balance of power and compassion. Only in this way, will I be able to lead a team of people to realizing the goals of a firm. To satisfy my desire for success, I must continue my education. . I am very excited about entering an MBA program that will allow me to focus on my interest in finance as well as provide me with the career possibilities and exposure to resources, such as networks and learning tools, which I do not currently have. I know that my investment of time, energy, and money will be well rewarded. At this point in my life, I believe I have great potential to gain much from a business degree since I have been exposed to the business environment for the past five and a half years. I now posses a strong foundation to build upon and I am ready to assume the rigors and challenges of the MBA program. If one were to ask my friends to describe me they would describe me as a very pleasant, diverse, active and intelligent man. I think one of my most distinguishing characteristics is the diversity of experiences I possess. I am a science student with a flair for the arts. I am someone with technical aptitude and an interest in management. I also have a passion for traveling and understanding different cultures of the world. All these elements have given me a very broad outlook, with varying degrees of knowledge in a range of topics. I strongly believe that although some are not related directly, all these qualities will influence my graduate work.

Admissions Essay: To Fly Alone :: Medicine College Admissions Essays

Admissions Essay: To Fly Alone "Dr. Johnson ... Dr. Johnson...." As I wearily walked down the artificially lit corridor, I realized it was my father's doctor being paged. I turned and ran towards the intensive care unit I had left a few minutes ago. The sterilized odor of the hospital overwhelmed me as I raced through a maze of white walls to confront his death. After bolting through heavy metal doors, I saw doctors and nurses rushing frantically around the room. I could only hear one sound. It filled the air and was audible above all the commotion and the heavy pounding of my heart. The monotonous beep of the monitor meant Daddy was gone forever. While sitting next to his cold body, I focused at the crimson drops, which stained the yellow linoleum floor and slowly remembered what a terrible ordeal the past six weeks of hospitalization had been. My Life had changed forever since the day I sped through traffic with my Dad shivering in the back seat next to my worried mother. I was scared to death without even knowing that the killer was Leukemia. Although the chemotherapy proceeded well, it gradually wore my father away. The first side effects were a loss of appetite accompanied by nausea and vomiting. His hair fell out next, and I could tell my Father's courage was beginning to waver. A look of pain and anguish had replaced his usual smile and with each passing day he looked more like my grandfather. It all seemed like a bad dream. While packing up hours after he had passed away, I found a note directed towards me. It was in Father's handwriting; blurry scribbles because the medicine made his hands shake. I sat down and cried because it said in Spanish, "My son, it is time for you to fly alone." It is hard to understand Dad's absence, and that he left on my 17th birthday. Although I miss him everyday I am grateful for all the time we spent together and everything my father taught me. He pointed me in the right direction and made me believe in myself. There is good in this beautiful world, and life will always receive my best effort. I will never be embarrassed by my heritage and will succeed. I know he is proud of me.

Language in Shakespeares The Tempest Essay -- essays research papers

This essay will attempt to find out the type of language that Shakespeare has used to portray the hatred and utter spite Prospero evidently has over Caliban. The great number of offensive dialogue during the argumentative conversation between Caliban and Prospero will be commented on. During the conversation, many ill-disguised remarks of contempt are made by all three characters. This will be analysed further and the reasons and consequences of the exchange will be described. There are a great number of reasons for why Prospero and Caliban are not by any means on respectful terms, and the factors that have lead to this occurrence will be expressed in order to explain the spiteful nature of Prospero in particular. In the play ‘The Tempest’, Prospero and Caliban are portrayed as two completely opposite characters with contradictory and clashing views. Prospero, who was the rightful heir to become duke of Milan before being cast away and the ‘deformed slave’ Caliban are symbolic of opposite extremes, particularly in their roles in society and hierarchy. Prospero is a natural leader and is intellectually disciplined, while Caliban not only does not behave in this kind of manner, he seems to completely stand against it and ignore any order and is ‘capable of all ill’ according to Prospero. Caliban’s careless, unethical nature, and being born as part of a ‘vile race’ is an immediately apparent reason for Prospero’s hatred of him. Shakespeare quickly portrays the two characters as of clashing personalities during the passage, depicting Prospero as a person who emphasizes social lustre and class and uses his great intellect to onl y give others what he thinks they deserve. While Caliban is illustrated as an animalistic character, wi... ...can show his true contempt. In conclusion, the language Shakespeare uses to depict the hatred Prospero has for Caliban emphasises the separate backgrounds and values they share and the lack of understanding they have for one another. The fact that Prospero is heir to being duke of Milan and Caliban is the product of an unholy passion between the witch Sycorax and the devil, suggest opposing themes of backgrounds and therefore they share contradictory views of each others heritage and conduct. Therefore they stand against what the other values, causing a clash. The reader may feel that Prospero’s contempt of Caliban is within reason, due to his attempted violation of Miranda, and the fact that Prospero has been hurt and betrayed by many in the past, and therefore has a great amount of vengeance he can share out due to the attachment he has with his fiery emotions.

Ncert Physics Book

Presents NCERT Text Books NCERT Text Books: 11th Class Physics About Us: Prep4Civils, website is a part of Sukratu Innovations, a start up by IITians. The main theme of the company is to develop new web services which will help people. P rep4Civils is an online social networking platform intended for the welfare of people who are preparing for Civil services examinations. The whole website was built on open-source platform WordPress. Contact Details: Website: http://www. prep4civils. com/ Email: [email  protected] comDisclaimer and Terms of Use: By following Creative Common License, for the welfare of large student body we are merging all the PDF files provided by NCERT website and redistributing the files by giving proper credit to NCERT website and the redistribution is based on the norms of Creative Common License. We are not commercially distributing the files. People who are downloading these files should not be engaged in any sort of sales or commercial distribution of these files. They can redistribute these copies freely by giving proper credit to the original author, NCERT (http://www. ncert. nic. in/NCERTS/textbook/textbook. tm) and â€Å"Prep4Civils† (http://www. prep4civils. com/) by providing proper hyperlinks of the websites. Any sort of cliches can be addressed at [email  protected] com and proper action will be taken. CONTENTS FOREWORD PREFACE A NOTE FOR THE TEACHER CHAPTER iii v x 1 PHYSICAL WORLD 1. 1 1. 2 1. 3 1. 4 1. 5 What is physics ? Scope and excitement of physics Physics, technology and society Fundamental forces in nature Nature of physical laws CHAPTER 1 2 5 6 10 2 UNITS AND MEASUREMENTS 2. 1 2. 2 2. 3 2. 4 2. 5 2. 6 2. 7 2. 8 2. 9 2. 10 Introduction The international system of units Measurement of length Measurement of massMeasurement of time Accuracy, precision of instruments and errors in measurement Significant figures Dimensions of physical quantities Dimensional formulae and dimensional equations Dimensional analysis and its applications CHAPTER 16 16 18 21 22 22 27 31 31 32 3 MOTION IN A STRAIGHT LINE 3. 1 3. 2 3. 3 3. 4 3. 5 3. 6 3. 7 Introduction Position, path length and displacement Average velocity and average speed Instantaneous velocity and speed Acceleration Kinematic equations for uniformly accelerated motion Relative velocity CHAPTER 39 39 42 43 45 47 51 4 MOTION IN A PLANE 4. 1 4. 2 4. 3 4. 4 4. 5 IntroductionScalars and vectors Multiplication of vectors by real numbers Addition and subtraction of vectors – graphical method Resolution of vectors 65 65 67 67 69 CK xii 4. 6 4. 7 4. 8 4. 9 4. 10 4. 11 Vector addition – analytical method Motion in a plane Motion in a plane with constant acceleration Relative velocity in two dimensions Projectile motion Uniform circular motion CHAPTER 71 72 75 76 77 79 5 LAWS OF MOTION 5. 1 5. 2 5. 3 5. 4 5. 5 5. 6 5. 7 5. 8 5. 9 5. 10 5. 11 Introduction Aristotle’s fallacy The law of inertia Newton’s first law of motion Newton ’s second law of motion Newton’s third law of motion Conservation of momentumEquilibrium of a particle Common forces in mechanics Circular motion Solving problems in mechanics CHAPTER 89 90 90 91 93 96 98 99 100 104 105 6 WORK, ENERGY AND POWER 6. 1 6. 2 6. 3 6. 4 6. 5 6. 6 6. 7 6. 8 6. 9 6. 10 6. 11 6. 12 Introduction Notions of work and kinetic energy : The work-energy theorem Work Kinetic energy Work done by a variable force The work-energy theorem for a variable force The concept of potential energy The conservation of mechanical energy The potential energy of a spring Various forms of energy : the law of conservation of energy Power Collisions CHAPTER 114 116 116 117 118 119 120 121 123 126 28 129 7 SYSTEM OF PARTICLES AND ROTATIONAL MOTION 7. 1 7. 2 7. 3 7. 4 7. 5 7. 6 7. 7 7. 8 7. 9 7. 10 Introduction Centre of mass Motion of centre of mass Linear momentum of a system of particles Vector product of two vectors Angular velocity and its relation with linear veloci ty Torque and angular momentum Equilibrium of a rigid body Moment of inertia Theorems of perpendicular and parallel axes 141 144 148 149 150 152 154 158 163 164 CK xiii 7. 11 7. 12 7. 13 7. 14 Kinematics of rotational motion about a fixed axis Dynamics of rotational motion about a fixed axis Angular momentum in case of rotations about a fixed axisRolling motion CHAPTER 167 169 171 173 8 GRAVITATION 8. 1 8. 2 8. 3 8. 4 8. 5 8. 6 8. 7 8. 8 8. 9 8. 10 8. 11 8. 12 Introduction Kepler’s laws Universal law of gravitation The gravitational constant Acceleration due to gravity of the earth Acceleration due to gravity below and above the surface of earth Gravitational potential energy Escape speed Earth satellite Energy of an orbiting satellite Geostationary and polar satellites Weightlessness 183 184 185 189 189 190 191 193 194 195 196 197 APPENDICES 203 ANSWERS 219 CK CK CONTENTS FOREWORD PREFACE A NOTE FOR THE TEACHERS CHAPTER iii vii x 9 MECHANICAL PROPERTIES OF SOLIDS 9. 9. 2 9. 3 9. 4 9. 5 9. 6 9. 7 Introduction Elastic behaviour of solids Stress and strain Hooke’s law Stress-strain curve Elastic moduli Applications of elastic behaviour of materials CHAPTER 231 232 232 234 234 235 240 10 MECHANICAL PROPERTIES OF FLUIDS 10. 1 10. 2 10. 3 10. 4 10. 5 10. 6 10. 7 Introduction Pressure Streamline flow Bernoulli’s principle Viscosity Reynolds number Surface tension CHAPTER 246 246 253 254 258 260 261 11 THERMAL PROPERTIES OF MATTER 11. 1 11. 2 11. 3 11. 4 11. 5 11. 6 11. 7 11. 8 11. 9 11. 10 Introduction Temperature and heat Measurement of temperature Ideal-gas equation and absolute temperatureThermal expansion Specific heat capacity Calorimetry Change of state Heat transfer Newton’s law of cooling CHAPTER 274 274 275 275 276 280 281 282 286 290 12 THERMODYNAMICS 12. 1 12. 2 Introduction Thermal equilibrium 298 299 CK CK xii 12. 3 12. 4 12. 5 12. 6 12. 7 12. 8 12. 9 12. 10 12. 11 12. 12 12. 13 Zeroth law of thermodynamics Heat, internal ene rgy and work First law of thermodynamics Specific heat capacity Thermodynamic state variables and equation of state Thermodynamic processes Heat engines Refrigerators and heat pumps Second law of thermodynamics Reversible and irreversible processes Carnot engine CHAPTER 300 300 302 03 304 305 308 308 309 310 311 13 KINETIC THEORY 13. 1 13. 2 13. 3 13. 4 13. 5 13. 6 13. 7 Introduction Molecular nature of matter Behaviour of gases Kinetic theory of an ideal gas Law of equipartition of energy Specific heat capacity Mean free path CHAPTER 318 318 320 323 327 328 330 14 OSCILLATIONS 14. 1 14. 2 14. 3 14. 4 14. 5 14. 6 14. 7 14. 8 14. 9 14. 10 Introduction Periodic and oscilatory motions Simple harmonic motion Simple harmonic motion and uniform circular motion Velocity and acceleration in simple harmonic motion Force law for simple harmonic motion Energy in simple harmonic motion Some systems executing SHMDamped simple harmonic motion Forced oscillations and resonance CHAPTER 336 337 339 341 343 345 346 347 351 353 15 WAVES 15. 1 15. 2 15. 3 15. 4 15. 5 15. 6 Introduction Transverse and longitudinal waves Displacement relation in a progressive wave The speed of a travelling wave The principle of superposition of waves Reflection of waves 363 365 367 369 373 374 CK CK xiii 15. 7 15. 8 Beats Doppler effect 379 381 ANSWERS 391 BIBLIOGRAPHY 401 INDEX 403 CK CHAPTER ONE PHYSICAL WORLD 1. 1 WHAT IS PHYSICS ? 1. 1 What is physics ? 1. 2 Scope and excitement of physics 1. 3 Physics, technology and society 1. 4 Fundamental forces in nature 1. Nature of physical laws Summary Exercises Humans have always been curious about the world around them. The night sky with its bright celestial objects has fascinated humans since time immemorial. The regular repetitions of the day and night, the annual cycle of seasons, the eclipses, the tides, the volcanoes, the rainbow have always been a source of wonder. The world has an astonishing variety of materials and a bewildering diversity of life and behaviour. The inquiring and imaginative human mind has responded to the wonder and awe of nature in different ways. One kind of response from the earliest times has been to observe the hysical environment carefully, look for any meaningful patterns and relations in natural phenomena, and build and use new tools to interact with nature. This human endeavour led, in course of time, to modern science and technology. The word Science originates from the Latin verb Scientia meaning ‘to know’. The Sanskrit word Vijnan and the Arabic word Ilm c onvey similar meaning, namely ‘knowledge’. Science, in a broad sense, is as old as human species. The early civilisations of Egypt, India, China, Greece, Mesopotamia and many others made vital contributions to its progress. From the sixteenth century onwards, great strides were made n science in Europe. By the middle of the twentieth century, science had become a truly international enterprise, with many cultures and countries contributing to its rapid growth. What is Science and what is the so-called Scientific Method ? Science is a systematic attempt to understand natural phenomena in as much detail and depth as possible, and use the knowledge so gained to predict, modify and control phenomena. Science is exploring, experimenting and predicting from what we see around us. The curiosity to learn about the world, unravelling the secrets of nature is the first step towards the discovery of science.The scientific method involves several interconnected steps : Systematic observations, controlled experiments, qualitative and 2 quantitative reasoning, mathematical modelling, prediction and verification or falsification of theories. Speculation and conjecture also have a place in science; but ultimately, a scientific theory, to be acceptable, must be verified by relevant observations or experiments. There is much philosophical debate about the nature and method of science that we need not discuss here. The interplay of theory and observation (or experiment) is basic to the progress of science. Science is ever dynamic.There is no ‘final’ theory in science and no unquestioned authority among scientists. As observations improve in detail and precision or experiments yield new results, theories must account for them, if necessary, by introducing modifications. Sometimes the modifications may not be drastic and may lie within the framework of existing theory. For example, when Johannes Kepler (1571-1630) examined the extensive data on planetary motion collected by Tycho Brahe (1546-1601), the planetary circular orbits in heliocentric theory (sun at the centre of the solar system) imagined by Nicolas Copernicus (1473–1543) had to be replaced by elliptical rbits to fit the data better. Occasionally, however, the existing theory is simply unable to explain new observations. This causes a major upheaval in science. In the beginning of the twentieth century, it wa s realised that Newtonian mechanics, till then a very successful theory, could not explain some of the most basic features of atomic phenomena. Similarly, the then accepted wave picture of light failed to explain the photoelectric effect properly. This led to the development of a radically new theory (Quantum Mechanics) to deal with atomic and molecular phenomena. Just as a new experiment may suggest an lternative theoretical model, a theoretical advance may suggest what to look for in some experiments. The result of experiment of scattering of alpha particles by gold foil, in 1911 by Ernest Rutherford (1871–1937) established the nuclear model of the atom, which then became the basis of the quantum theory of hydrogen atom given in 1913 by Niels Bohr (1885–1962). On the other hand, the concept of antiparticle was first introduced theoretically by Paul Dirac (1902–1984) in 1930 and confirmed two years later by the experimental discovery of positron (antielectron) by Carl Anderson. P HYSICS Physics is a basic discipline in the category f Natural Sciences, which also includes other disciplines like Chemistry and Biology. The word Physics comes from a Greek word meaning nature. Its Sanskrit equivalent is Bhautiki that is used to refer to the study of the physical world. A precise definition of this discipline is neither possible nor necessary. We can broadly describe physics as a study of the basic laws of nature and their manifestation in different natural phenomena. The scope of physics is described briefly in the next section. Here we remark on two principal thrusts in physics : unification and reduction. In Physics, we attempt to explain diverse hysical phenomena in terms of a few concepts and laws. The effort is to see the physical world as manifestation of some universal laws in different domains and conditions. For example, the same law of gravitation (given by Newton) describes the fall of an apple to the ground, the motion of the moon around the earth and the motion of planets around the sun. Similarly, the basic laws of electromagnetism (Maxwell’s equations) govern all electric and magnetic phenomena. The attempts to unify fundamental forces of nature (section 1. 4) reflect this same quest for unification. A related effort is to derive the properties of a igger, more complex, system from the properties and interactions of its constituent simpler parts. This approach is called reductionism and is at the heart of physics. For example, the subject of thermodynamics, developed in the nineteenth century, deals with bulk systems in terms of macroscopic quantities such as temperature, internal energy, entropy, etc. Subsequently, the subjects of kinetic theory and statistical mechanics interpreted these quantities in terms of the properties of the molecular constituents of the bulk system. In particular, the temperature was seen to be related to the average kinetic energy of molecules of the system. . 2 SCOPE AND EXCITEMENT OF PHYSICS We can get some idea of the scope of physics by looking at its various sub-disciplines. Basically, there are two domains of interest : macroscopic and microscopic. The macroscopic domain includes phenomena at the laboratory, terrestrial and astronomical scales. The microscopic domain includes atomic, molecular and nuclear P HYSICAL WORLD phenomena*. Classical Physics deals mainly with macroscopic phenomena and includes subjects like Mechanics, Electrodynamics, Optics a nd T hermodynamics . Mechanics founded on Newton’s laws of motion and the law of gravitation is concerned with the motion (or quilibrium) of particles, rigid and deformable bodies, and general systems of particles. The propulsion of a rocket by a jet of ejecting gases, propagation of water waves or sound waves in air, the equilibrium of a bent rod under a load, etc. , are problems of mechanics. Electrodynamics deals with electric and magnetic phenomena associated with charged and magnetic bodies. Its basic laws were given by Coulomb, Oersted, Fig. 1. 1 chemical process, etc. , are problems of interest in thermodynamics. The microscopic domain of physics deals with the constitution and structure of matter at the minute scales of atoms and nuclei (and even ower scales of length) and their interaction with different probes such as electrons, photons and other elementary particles. Classical physics is inadequate to handle this domain and Quantum Theory is currently accepted as the proper framework for explaining microscopic phenomena. Overall, the edifice of physics is beautiful and imposing and you will appreciate it more as you pursue the subject. Theory and experiment go hand in hand in physics and help each other’s progress. The alpha scattering experiments of Rutherford gave the nuclear model of the atom. Ampere and Faraday, and encapsulated by Maxwell in his famous set of equations.The motion of a current-carrying conductor in a magnetic field, the respons e of a circuit to an ac voltage (signal), the working of an antenna, the propagation of radio waves in the ionosphere, etc. , are problems of electrodynamics. Optics deals with the phenomena involving light. The working of telescopes and microscopes, colours exhibited by thin films, etc. , are topics in optics. Thermodynamics, in contrast to mechanics, does not deal with the motion of bodies as a whole. Rather, it deals with systems in macroscopic equilibrium and is concerned with changes in internal energy, temperature, entropy, etc. , of the ystem through external work and transfer of heat. The efficiency of heat engines and refrigerators, the direction of a physical or * 3 You can now see that the scope of physics is truly vast. It covers a tremendous range of magnitude of physical quantities like length, mass, time, energy, etc. At one end, it studies phenomena at the very small scale of length -14 (10 m or even less) involving electrons, protons, etc. ; at the other end, it dea ls with astronomical phenomena at the scale of galaxies or even the entire universe whose extent is of the order of 26 10 m. The two length scales differ by a factor of 40 10 or even more.The range of time scales can be obtained by dividing the length scales by the –22 speed of light : 10 s to 1018 s. The range of masses goes from, say, 10–30 kg (mass of an 55 electron) to 10 kg (mass of known observable universe). Terrestrial phenomena lie somewhere in the middle of this range. Recently, the domain intermediate between the macroscopic and the microscopic (the so-called mesoscopic physics), dealing with a few tens or hundreds of atoms, has emerged as an exciting field of research. 4 Physics is exciting in many ways. To some people the excitement comes from the elegance and universality of its basic theories, from the fact that few basic concepts and laws can explain phenomena covering a large range of magnitude of physical quantities. To some others, the challenge in c arrying out imaginative new experiments to unlock the secrets of nature, to verify or refute theories, is thrilling. Applied physics is equally demanding. Application and exploitation of physical laws to make useful devices is the most interesting and exciting part and requires great ingenuity and persistence of effort. What lies behind the phenomenal progress of physics in the last few centuries? Great progress usually accompanies changes in our basic perceptions.First, it was realised that for scientific progress, only qualitative thinking, though no doubt important, is not enough. Quantitative measurement is central to the growth of science, especially physics, because the laws of nature happen to be expressible in precise mathematical equations. The second most important insight was that the basic laws of physics are universal — the same laws apply in widely different contexts. Lastly, the strategy of approximation turned out to be very successful. Most observed phenomena in daily life are rather complicated manifestations of the basic laws. Scientists recognised the importance f extracting the essential features of a phenomenon from its less significant aspects. It is not practical to take into account all the complexities of a phenomenon in one go. A good strategy is to focus first on the essential features, discover the basic principles and then introduce corrections to build a more refined theory of the phenomenon. For example, a stone and a feather dropped from the same height do not reach the ground at the same time. The reason is that the essential aspect of the phenomenon, namely free fall under gravity, is complicated by the presence of air resistance. To get the law of free all under gravity, it is better to create a situation wherein the air resistance is negligible. We can, for example, let the stone and the feather fall through a long evacuated tube. In that case, the two objects will fall almost at the same rate, giving the basic law t hat acceleration due to gravity is independent of the mass of the object. With the basic law thus found, we can go back to the feather, introduce corrections due to air resistance, modify the existing theory and try to build a more realistic P HYSICS Hypothesis, axioms and models One should not think that everything can be proved with physics and mathematics.All physics, and also mathematics, is based on assumptions, each of which is variously called a hypothesis or axiom or postulate, etc. For example, the universal law of gravitation proposed by Newton is an assumption or hypothesis, which he proposed out of his ingenuity. Before him, there were several observations, experiments and data, on the motion of planets around the sun, motion of the moon around the earth, pendulums, bodies falling towards the earth etc. Each of these required a separate explanation, which was more or less qualitative. What the universal law of gravitation says is that, if we assume that any two odies in the universe attract each other with a force proportional to the product of their masses and inversely proportional to the square of the distance between them, then we can explain all these observations in one stroke. It not only explains these phenomena, it also allows us to predict the results of future experiments. A hypothesis is a supposition without assuming that it is true. It would not be fair to ask anybody to prove the universal law of gravitation, because it cannot be proved. It can be verified and substantiated by experiments and observations. An axiom is a self-evident truth while a model s a theory proposed to explain observed phenomena. But you need not worry at this stage about the nuances in using these words. For example, next year you will learn about Bohr’s model of hydrogen atom, in which Bohr assumed that an electron in the hydrogen atom follows certain rules (postutates). Why did he do that? There was a large amount of spectroscopic data before him whic h no other theory could explain. So Bohr said that if we assume that an atom behaves in such a manner, we can explain all these things at once. Einstein’s special theory of relativity is also based on two postulates, the constancy of the speed f electromagnetic radiation and the validity of physical laws in all inertial frame of reference. It would not be wise to ask somebody to prove that the speed of light in vacuum is constant, independent of the source or observer. In mathematics too, we need axioms and hypotheses at every stage. Euclid’s statement that parallel lines never meet, is a hypothesis. This means that if we assume this statement, we can explain several properties of straight lines and two or three dimensional figures made out of them. But if you don’t assume it, you are free to use a different axiom and get a new geometry, as has indeed happened in he past few centuries and decades. P HYSICAL WORLD 5 theory of objects falling to the earth under gr avity. 1. 3 PHYSICS, TECHNOLOGY AND SOCIETY The connection between physics, technology and society can be seen in many examples. The discipline of thermodynamics arose from the need to understand and improve the working of heat engines. The steam engine, as we know, is inseparable from the Industrial Revolution in England in the eighteenth century, which had great impact on the course of human civilisation. Sometimes technology gives rise to new physics; at other times physics generates new technology.An example of the latter is the wireless communication technology that followed the discovery of the basic laws of electricity and magnetism in the nineteenth century. The applications of physics are not always easy to foresee. As late as 1933, the great physicist Ernest Rutherford had dismissed the possibility of tapping energy from atoms. But only a few years later, in 1938, Hahn and Meitner discovered the phenomenon of neutron-induced fission of uranium, which would serve as the bas is of nuclear power reactors and nuclear weapons. Yet another important example of physics giving rise to technology is the silicon chip’ that triggered the computer revolution in the last three decades of the twentieth century. A most significant area to which physics has and will contribute is the development of alternative energy resources. The fossil fuels of the planet are dwindling fast and there is an urgent need to discover new and affordable sources of energy. Considerable progress has already been made in this direction (for example, in conversion of solar energy, geothermal energy, etc. , into electricity), but much more is still to be accomplished. Table1. 1 lists some of the great physicists, their major contribution and the country of rigin. You will appreciate from this table the multi-cultural, international character of the scientific endeavour. Table 1. 2 lists some important technologies and the principles of physics they are based on. Obviously, these tabl es are not exhaustive. We urge you to try to add many names and items to these tables with the help of your teachers, good books and websites on science. You will find that this exercise is very educative and also great fun. And, assuredly, it will never end. The progress of science is unstoppable! Physics is the study of nature and natural phenomena. Physicists try to discover the rules hat are operating in nature, on the basis of observations, experimentation and analysis. Physics deals with certain basic rules/laws governing the natural world. What is the nature Table 1. 1 Some physicists from different countries of the world and their major contributions Name Major contribution/discovery Country of Origin Archimedes Principle of buoyancy; Principle of the lever Greece Galileo Galilei Law of inertia Italy Christiaan Huygens Wave theory of light Holland Isaac Newton Universal law of gravitation; Laws of motion; Reflecting telescope U. K. Michael Faraday Laws of electromagnetic ind uction U. K. James Clerk MaxwellElectromagnetic theory; Light-an electromagnetic wave U. K. Heinrich Rudolf Hertz Generation of electromagnetic waves Germany J. C. Bose Ultra short radio waves India W. K. Roentgen X-rays Germany J. J. Thomson Electron U. K. Marie Sklodowska Curie Discovery of radium and polonium; Studies on Poland natural radioactivity Albert Einstein Explanation of photoelectric effect; Theory of relativity Germany 6 P HYSICS Name Major contribution/discovery Country of Origin Victor Francis Hess Cosmic radiation Austria R. A. Millikan Measurement of electronic charge U. S. A. Ernest Rutherford Nuclear model of atom New Zealand Niels BohrQuantum model of hydrogen atom Denmark C. V. Raman Inelastic scattering of light by molecules India Louis Victor de Borglie Wave nature of matter France M. N. Saha Thermal ionisation India S. N. Bose Quantum statistics India Wolfgang Pauli Exclusion principle Austria Enrico Fermi Controlled nuclear fission Italy Werner Heisenberg Q uantum mechanics; Uncertainty principle Germany Paul Dirac Relativistic theory of electron; Quantum statistics U. K. Edwin Hubble Expanding universe U. S. A. Ernest Orlando Lawrence Cyclotron U. S. A. James Chadwick Neutron U. K. Hideki Yukawa Theory of nuclear forces Japan Homi Jehangir BhabhaCascade process of cosmic radiation India Lev Davidovich Landau Theory of condensed matter; Liquid helium Russia S. Chandrasekhar Chandrasekhar limit, structure and evolution of stars India John Bardeen Transistors; Theory of super conductivity U. S. A. C. H. Townes Maser; Laser U. S. A. Abdus Salam Unification of weak and electromagnetic interactions Pakistan of physical laws? We shall now discuss the nature of fundamental forces and the laws that govern the diverse phenomena of the physical world. 1. 4 FUNDAMENTAL FORCES IN NATURE* We all have an intuitive notion of force. In our experience, force is needed to push, carry or hrow objects, deform or break them. We also experience the impact o f forces on us, like when a moving object hits us or we are in a merry-goround. Going from this intuitive notion to the proper scientific concept of force is not a trivial matter. Early thinkers like Aristotle had wrong * ideas about it. The correct notion of force was arrived at by Isaac Newton in his famous laws of motion. He also gave an explicit form for the force for gravitational attraction between two bodies. We shall learn these matters in subsequent chapters. In the macroscopic world, besides the gravitational force, we encounter several kinds f forces: muscular force, contact forces between bodies, friction (which is also a contact force parallel to the surfaces in contact), the forces exerted by compressed or elongated springs and taut strings and ropes (tension), the force of buoyancy and viscous force when solids are in Sections 1. 4 and 1. 5 contain several ideas that you may not grasp fully in your first reading. However, we advise you to read them carefully to develo p a feel for some basic aspects of physics. These are some of the areas which continue to occupy the physicists today. P HYSICAL WORLD 7 Table 1. 2 Link between technology and physics TechnologyScientific principle(s) Steam engine Laws of thermodynamics Nuclear reactor Controlled nuclear fission Radio and Television Generation, propagation and detection of electromagnetic waves Computers Digital logic Lasers Light amplification by stimulated emission of radiation Production of ultra high magnetic fields Superconductivity Rocket propulsion Newton’s laws of motion Electric generator Faraday’s laws of electromagnetic induction Hydroelectric power Conversion of gravitational potential energy into electrical energy Aeroplane Bernoulli’s principle in fluid dynamics Particle accelerators Motion of charged particles in electromagnetic ields Sonar Reflection of ultrasonic waves Optical fibres Total internal reflection of light Non-reflecting coatings Thin film optical in terference Electron microscope Wave nature of electrons Photocell Photoelectric effect Fusion test reactor (Tokamak) Magnetic confinement of plasma Giant Metrewave Radio Telescope (GMRT) Detection of cosmic radio waves Bose-Einstein condensate Trapping and cooling of atoms by laser beams and magnetic fields. contact with fluids, the force due to pressure of a fluid, the force due to surface tension of a liquid, and so on. There are also forces involving charged nd magnetic bodies. In the microscopic domain again, we have electric and magnetic forces, nuclear forces involving protons and neutrons, interatomic and intermolecular forces, etc. We shall get familiar with some of these forces in later parts of this course. A great insight of the twentieth century physics is that these different forces occurring in different contexts actually arise from only a small number of fundamental forces in nature. For example, the elastic spring force arises due to the net attraction/repulsion betw een the neighbouring atoms of the spring when the spring is elongated/compressed. This net ttraction/repulsion can be traced to the (unbalanced) sum of electric forces between the charged constituents of the atoms. In principle, this means that the laws for ‘derived’ forces (such as spring force, friction) are not independent of the laws of fundamental forces in nature. The origin of these derived forces is, however, very complex. At the present stage of our understanding, we know of four fundamental forces in nature, which are described in brief here : 8 P HYSICS Albert Einstein (1879-1955) Albert Einstein, born in Ulm, Germany in 1879, is universally regarded as one of the greatest physicists of all time.His astonishing scientific career began with the publication of three path-breaking papers in 1905. In the first paper, he introduced the notion of light quanta (now called photons) and used it to explain the features of photoelectric effect that the classical wave th eory of radiation could not account for. In the second paper, he developed a theory of Brownian motion that was confirmed experimentally a few years later and provided a convincing evidence of the atomic picture of matter. The third paper gave birth to the special theory of relativity that made Einstein a legend in his own life time.In the next decade, he explored the consequences of his new theory which included, among other things, the mass-energy equivalence enshrined in his famous equation E = mc2. He also created the general version of relativity (The General Theory of Relativity), which is the modern theory of gravitation. Some of Einstein’s most significant later contributions are: the notion of stimulated emission introduced in an alternative derivation of Planck’s blackbody radiation law, static model of the universe which started modern cosmology, quantum statistics of a gas of massive bosons, and a critical analysis of the foundations of quantum mechanics.Th e year 2005 was declared as International Year of Physics, in recognition of Einstein’s monumental contribution to physics, in year 1905, describing revolutionary scientific ideas that have since influenced all of modern physics. 1. 4. 1 Gravitational Force The gravitational force is the force of mutual attraction between any two objects by virtue of their masses. It is a universal force. Every object experiences this force due to every other object in the universe. All objects on the earth, for example, experience the force of gravity due to the earth. In particular, gravity governs the motion of the moon and artificial satellites around he earth, motion of the earth and planets around the sun, and, of course, the motion of bodies falling to the earth. It plays a key role in the large-scale phenomena of the universe, such as formation and evolution of stars, galaxies and galactic clusters. 1. 4. 2 Electromagnetic Force Electromagnetic force is the force between charged parti cles. In the simpler case when charges are at rest, the force is given by Coulomb’s law : attractive for unlike charges and repulsive for like charges. Charges in motion produce magnetic effects and a magnetic field gives rise to a force on a moving charge. Electric nd magnetic effects are, in general, inseparable – hence the name electromagnetic force. Like the gravitational force, electromagnetic force acts over large distances and does not need any intervening medium. It is enormously strong compared to gravity. The electric force between two protons, for example, 36 is 10 times the gravitational force between them, for any fixed distance. Matter, as we know, consists of elementary charged constituents like electrons and protons. Since the electromagnetic force is so much stronger than the gravitational force, it dominates all phenomena at atomic and molecular scales. (The other two forces, as we hall see, operate only at nuclear scales. ) Thus it is mainly the elec tromagnetic force that governs the structure of atoms and molecules, the dynamics of chemical reactions and the mechanical, thermal and other properties of materials. It underlies the macroscopic forces like ‘tension’, ‘friction’, ‘normal force’, ‘spring force’, etc. Gravity is always attractive, while electromagnetic force can be attractive or repulsive. Another way of putting it is that mass comes only in one variety (there is no negative mass), but charge comes in two varieties : positive and negative charge. This is what makes all the difference.Matter is mostly electrically neutral (net charge is zero). Thus, electric force is largely zero and gravitational force dominates terrestrial phenomena. Electric force manifests itself in atmosphere where the atoms are ionised and that leads to lightning. P HYSICAL WORLD 9 Satyendranath Bose (1894-1974) Satyendranath Bose, born in Calcutta in 1894, is among the great Indian physicists who made a fundamental contribution to the advance of science in the twentieth century. An outstanding student throughout, Bose started his career in 1916 as a lecturer in physics in Calcutta University; five years later he joined Dacca University.Here in 1924, in a brilliant flash of insight, Bose gave a new derivation of Planck’s law, treating radiation as a gas of photons and employing new statistical methods of counting of photon states. He wrote a short paper on the subject and sent it to Einstein who immediately recognised its great significance, translated it in German and forwarded it for publication. Einstein then applied the same method to a gas of molecules. The key new conceptual ingredient in Bose’s work was that the particles were regarded as indistinguishable, a radical departure from the assumption that underlies the classical MaxwellBoltzmann statistics.It was soon realised that the new Bose-Einstein statistics was applicable to particles with integers spins, and a new quantum statistics (Fermi-Dirac statistics) was needed for particles with half integers spins satisfying Pauli’s exclusion principle. Particles with integers spins are now known as bosons in honour of Bose. An important consequence of Bose-Einstein statistics is that a gas of molecules below a certain temperature will undergo a phase transition to a state where a large fraction of atoms populate the same lowest energy state.Some seventy years were to pass before the pioneering ideas of Bose, developed further by Einstein, were dramatically confirmed in the observation of a new state of matter in a dilute gas of ultra cold alkali atoms – the Bose-Eintein condensate. If we reflect a little, the enormous strength of the electromagnetic force compared to gravity is evident in our daily life. When we hold a book in our hand, we are balancing the gravitational force on the book due to the huge mass of the earth by the ‘normal force’ provided by our hand. The latter is nothing but the net electromagnetic force between the charged constituents of our hand and he book, at the surface in contact. If electromagnetic force were not intrinsically so much stronger than gravity, the hand of the strongest man would crumble under the weight of a feather ! Indeed, to be consistent, in that circumstance, we ourselves would crumble under our own weight ! 1. 4. 3 Strong Nuclear Force The strong nuclear force binds protons and neutrons in a nucleus. It is evident that without some attractive force, a nucleus will be unstable due to the electric repulsion between its protons. This attractive force cannot be gravitational since force of gravity is negligible compared to the electric force.A new basic force must, therefore, be invoked. The strong nuclear force is the strongest of all fundamental forces, about 100 times the electromagnetic force in strength. It is charge-independent and acts equally between a proton and a proton, a neutron a nd a neutron, and a proton and a neutron. Its range is, however, extremely small, –15 of about nuclear dimensions (10 m). It is responsible for the stability of nuclei. The electron, it must be noted, does not experience this force. Recent developments have, however, indicated that protons and neutrons are built out of still more elementary constituents called quarks. . 4. 4 Weak Nuclear Force The weak nuclear force appears only in certain nuclear processes such as the ? -decay of a nucleus. In ? -decay, the nucleus emits an electron and an uncharged particle called neutrino. The weak nuclear force is not as weak as the gravitational force, but much weaker than the strong nuclear and electromagnetic forces. The range of weak nuclear force is exceedingly small, of the order of 10-16 m. 1. 4. 5 Towards Unification of Forces We remarked in section 1. 1 that unification is a basic quest in physics. Great advances in physics often amount to unification of different 10 P HYSICS Tab le 1. Fundamental forces of nature Name Relative strength Range Operates among Gravitational force 10 –39 Infinite All objects in the universe Weak nuclear force 10–13 Very short, Sub-nuclear size ( ? –16 m) 10 Some elementary particles, particularly electron and neutrino Electromagnetic force 10–2 Infinite Charged particles Strong nuclear force 1 Short, nuclear size ( ? –15 m) 10 Nucleons, heavier elementary particles theories and domains. Newton unified terrestrial and celestial domains under a common law of gravitation. The experimental discoveries of Oersted and Faraday showed that electric and magnetic phenomena are in general nseparable. Maxwell unified electromagnetism and optics with the discovery that light is an electromagnetic wave. Einstein attempted to unify gravity and electromagnetism but could not succeed in this venture. But this did not deter physicists from zealously pursuing the goal of unification of forces. Recent decades have seen much progress on this front. The electromagnetic and the weak nuclear force have now been unified and are seen as aspects of a single ‘electro-weak’ force. What this unification actually means cannot be explained here. Attempts have been (and are being) made to unify the electro-weak and the trong force and even to unify the gravitational force with the rest of the fundamental forces. Many of these ideas are still speculative and inconclusive. Table 1. 4 summarises some of the milestones in the progress towards unification of forces in nature. 1. 5 NATURE OF PHYSICAL LAWS Physicists explore the universe. Their investigations, based on scientific processes, range from particles that are smaller than atoms in size to stars that are very far away. In addition to finding the facts by observation and experimentation, physicists attempt to discover the laws that summarise (often as mathematical quations) these facts. In any physical phenomenon governed by different forc es, several quantities may change with time. A remarkable fact is that some special physical quantities, however, remain constant in time. They are the conserved quantities of nature. Understanding these conservation principles is very important to describe the observed phenomena quantitatively. For motion under an external conservative force, the total mechanical energy i. e. the sum of kinetic and potential energy of a body is a constant. The familiar example is the free fall of an object under gravity. Both the kinetic energy