Strength of material 2 Essay Example | Topics and Well Written Essays - 500 words

Strength of material 2 - Essay Example Beams: Beams are often classified according to their ideal support conditions as either simply supported beams or cantilever beams. Beams are subject to bending stresses when loads are applied and experience compressive, shear and tensile forces. A simply supported beam is fixed on two ends. When loading the maximum tensile stress occurs at the midpoint of the bottom edge of the beam and the maximum compressive stress occurs at the midpoint of the top edge. A cantilever beam is supported on one end only and must be built into the wall that supports it. Two forces act on cantilever beams – firstly, a vertical upward force which supports the weight of the beam and any downward loads and secondly ‘the fixing moment’ which prevents the unsupported beam from falling (Eric William Nelson et all, 1997). A beam may be strong enough to resist bending moments set up by its load and yet may sag without collapsing. This is called deflection and is dictated by the elasticity a nd strength of the material used to build it. Columns and Struts: Columns, also known as stanchions support compressional loads along their longitudinal axes. The effective of excessive loading on a column is that the column could cause it buckle or crush like a wall coming down. A ‘short column’ is one whose height is small relative to its thickness is small relative to its thickness. Whether or not the column will remain stable under increasing axial load will depend on the strength of the material that constitutes the column. A ‘long’ or ‘slender’ column has a greater height relative to its thickness. A long column becomes unstable and buckles at a load much smaller than which would crush a short column of the same cross-section and material. This is called the ‘critical load’. Unlike beams, the loading capacity of a column depends less upon the strength of the material of which it is made than upon its stiffness and this decreases with a

Rudolph Christian Karl Diesel :: essays research papers

Rudolph Christian Karl Diesel Rudolph Diesel was born on March 18, 1858 in Paris. On September 4, 1870 Rudolph's family moved to England. In late November they decided it would be better for Rudolph to continue his schooling in Germany so he moved there on his own and stayed with a young professor. The problems Rudolph was trying to solve were the noise, size and unreliability of the steam engine. he wanted to create something that superheated ammonia gas could take the place of steam in a steam engine. He wanted to enable much higher compression pressures to be used than was able with conventional steam engines. In this way he could make greater use of heat energy. Rudolph was 32 when he finally accomplished his goal of creating the first ever Diesel Engine. To create the Diesel engine which made Rudolph famous he had to take the original steam engine and give it exhaust valves water cooling for the cylinder head and barrel and a compressed air fuel-injection system to ensure that the liquid fuel was forced into the combustion space with sufficient pressure to overcome the air in the cylinder. This basic idea of how to go about creating the engine was modified and improved many times before finally prefected in 1896. To do this Rudolph had to have a great understanding of Thermodynamics. He had to know basic principles of engines and how they work. Rudolph got help from many people. Some of the people that helped him are Machine-fabric Augsburg, Gasmotoren-Fabric Deutz and Mannesmann-Werke. It took them six years to finish the Diesel Engine. It was important because it gave a new and easier way of using engines. It gave a way for large vehicles to transport goods safely.

The Struggle between Social Classes

Rich girl marrying a poor boy or vice versa—this is a very recurrent theme in love stories of all times. In the film genre, this theme also serves as a topic of interest as it reveals the conflict between the upper and the lower classes in society. In Jack Clayton’s (1959) film, Room at the Top, the director shows how the struggle between the two classes operates in the British society after the World War II. Depicting a poor man’s struggle as he tries to alter his place in society, the film attempts to mirror the reality that the poor will likely give in to the intention of the rich in view of economic struggle.Analysis of the characterisation, plot, theme, and motifs used in the film provides viewers a better knowledge of the two social classes. Characterisation The beginning of the film strongly suggests representations of the lower class. The main character, Joe Lampton (played by Laurence Harvey) is depicted sitting comfortably on a train, with his feet rais ed on the opposite seat, thus showing his mended socks. The introduction alone shows the man’s class standing, as he cannot afford to buy a new pair of socks, and resorts instead to wearing an old and tottered pair.This attitude of settling with the second best or whatever is available is reflected in his choice of women. Realising the difficulty of having Susan Brown as his girl due to the conflict in their social standing, Joe resorts to Alice Aisgill (played by Simone Signoret), his colleague, despite their big age difference. A number of juxtapositions are presented in the film. For instance, in spite of Joe’s financial incapability as symbolised by the socks, he wears the usual coat and tie as he reports for work.Whilst the first denotes poverty, the other suggests decency. Note that the coat and tie is customary in the British society especially in business affairs. As such, he and his colleagues wear the same type of clothing, which somehow levels off their stat us with that of the rich. Nevertheless, this does not change Joe’s social standing, and the way Susan’s family and friends view him. Based on his position as an accountant in Borough’s Treasurer’s Department, Joe is unquestionably educated.However, this does not necessarily help raise his social status as one belonging to the working class. This implies that it is not enough for a person to obtain education and a white-collared job in order to rise in the social hierarchy. Rather, marriage to a rich girl such as Susan, the daughter of a factory owner, could change one’s fortune as proposed later in the film. Juxtaposition is likewise established between the characters. For instance, Joe’s character is presented in opposition with Susan’s suitor, who is influential and sociable.Joe, being a newcomer in the Dufton, seldom socialises with his colleagues, and instead relates closely with a few of them, including Alice, whom he falls in lo ve with later. He is also seen in contrast with Susan, the girl who attracts him a lot. Their social standing primarily draws the line between them. Whilst Joe needs to work hard and establish connection with his colleagues, Susan does not need to work, and instead spends her time acting in local theatre. Also, whilst Joe transfers to Dufton to obtain employment, Susan is free to go on vacation as she pleases.Moreover, juxtaposition is also established between the two female characters, Alice and Susan. Aside from the women’s ages and marital status, they also differ in social status, in that Alice is an average office worker, whilst Susan is the daughter of an owner of a factory. This social difference between the two results in a struggle between them as Susan gets pregnant. Although Joe loves Alice more, and has planned to marry her, Mr. Brown’s (Susan’s father) proposition convinces Joe to change his mind, thus making way for the bourgeois to win over the pr oletarian.In addition, Alice’s former marriage to their colleague also makes less favourable, especially since her former husband would not agree to divorce. Considering this, the film does not only present struggles between social classes; it also demonstrates struggles based on gender as the women’s fate depends on Joe’s final decision. Further to the contrast between Alice and Susan, the former demonstrates more freedom of will, as she does things she likes, ie, shifts career, separates from her husband, and establishes relationship with Joe.Her habit of cigarette smoking throughout the film shows Alice’s easy-going and independent character; although it reflects her tensions in life at the same time. In contrast, Susan is pictured as a fresh and young girl, healthy-looking and innocent. Her social status prevents her from associating with the lower class, such as Joe, but it does not ultimately defeats her will to be independent. Plot The plot of the film supports the idea of struggle between the social classes. It shows a single unified structure, with the conflict appearing near the end, as Joe decides to marry Susan due to the latter’s pregnant condition.His decision conflicts with his wish to marry Alice. Thus, when the latter finds out, she gets totally devastated, and drowns in her sorrow and alcohol, which later leads to her death by car accident. Earlier in the story, Susan’s parents try to separate her from Joe by making her take a vacation. This motive demonstrates the struggle between social classes, in that the bourgeois discriminates the other, by preventing marriage between them. Later on, as Mr. Brown realises his daughter’s condition, he tries to buy off Joe, and offers to make him rich if Joe does what he commands.Initially, Joe exercises his pride and rejects the offer, but realising that Alice cannot be married with him, and that life with Susan would make his life comfortable, he agrees t o the proposition and marries Susan. As such, the class struggle is evident. Mr. Brown uses his money and power to buy off Joe. For his part, Joe cannot disagree with Mr. Brown for he sees this opportunity to escape his current social status. Being Susan’s husband, Joe does not need to work anymore, and all else will go smoothly because Susan is very wealthy.However, just as Joe attempts to escape his own social structure, he is haunted by it, with the death of Alice. Along with the proposition of Mr. Brown to make Joe a rich man is the defeat of the proletarian class. As Joe accepts the offer, he disremembers Alice’s sacrifices and love for him. What is sadder about it is knowing how little time it takes Joe to decide about leaving Alice. As shown in the film, everything happens over one dinner, too short a time to change plans or think things over; thus implying the power of money to further establish social injustice and discrimination, and in turn disregard social equality.Theme The main theme of the film, which is the struggle between social structures, relates to Marxist perspectives. Specifically, the presence of the two opposing structures, the bourgeois (as presented by Susan and her family) and the proletarian (Joe, Alice, and the other employees) implies the conflict in the film. As Marx & Engels (1848) claim, there is a social struggle that exists between the bourgeois or the middle class, â€Å"that sprouted from the ruins of feudal society,† and â€Å"established new classes, new conditions of oppression, new forms of struggle in place of the old ones.† In the film, as Mr. Brown gives Joe the marriage proposal, he implies designing Joe’s entire life—his marriage and career, in order to make sure it fits the structure that Susan is born with. Such plan illustrates â€Å"a new condition of oppression,† a new form of struggle for the proletarian. Physical attraction is what leads to the theme of socia l struggle. Everything starts as Joe becomes attracted to Susan and vice versa. Indeed, the two social classes would not conflict with each other if not for Joe’s feelings for Susan.In this consideration, one may see that the effort to reach or blend with another social class may result in a much worse conflict between them. However, such conflict could later lead to â€Å"permanently changing social relations within the system† (Strasser and Randall, 1981, p. 44). Thus, Susan’s pregnancy leads to â€Å"the development of new patterns of social relations,† between him and the Browns. Suddenly, Susan’s parents accept Joe as their daughter’s husband, owing to the reputation that they try to maintain in society.Motifs As mentioned above, the proletarian or working class is given focus in the film. Clayton uses realistic setting and motifs to depict the lives of the working class of the 50s. Amongst these include the dark, small houses where Ali ce and Joe spend their love affair, the male boarding house where Joe resides with her friend Soames, the local train which characterises the transportation means of the common people, and Joe’s seemingly abandoned house where he brings Susan the night they elope.The use of realistic setting thus emphasises the life lived by the proletarians. Juxtaposition is likewise applied to the setting. When Joe visits Susan, he is amazed by the huge house, which consists of the long halls, partitioned rooms, and the big lawn. Servants are available any moment they are needed. This is in full contrast with Alice’s place, which is dark and small. Aside from setting, the behaviour of the characters likewise mimics the ways of the working class.For instance, cigarette smoking is used vehemently throughout the film, giving impression of the start of the â€Å"new wave† era (Wickham, n. d. ), although such practices may be deemed destructive of the image of the working class. Li kewise, the affair between workers despite being committed is also hinted on, which reveals the low regard for morality of the said social class. Furthermore, the Alice’s fate at the end also reveals the proletarian’s lack of strength to face reality, the tendency to be alcoholic, and the low self-esteem amongst them.In contrast, the ways of the bourgeois are seen in better light. They are dressed neatly on each occasion; specifically, Susan’s mother shows modesty by the way she behaves and carries herself even whilst at home, whilst Susan shows coyness towards Joe. However, the proletarians are pictured with more social dynamics than their counterpart. This is seen as Soemes introduces Joe to their officemates. Everyone, despite their positions in the company, welcomes Joe with glee, whilst Susan’s suitor intimidates him.During the party where Joe and Susan meet again, the guests seated with the Browns look at Joe with contempt, after finding out that he does not belong to their social circle. In sum, whilst the proletarians are depicted as misguided and weak, the bourgeois are seen as virulent and vile. The monotonous music that the director employs does not entirely affect the whole of the film, yet it helps highlight important scenes such as the introduction, the falling in love and break up between Joe and Alice, the news about Alice’s death, the wedding, etc.Likewise, the actors’ costumes, which are limited to office and home settings, depict the simplicity of the people in the 50s. The director’s effort to make everything look realistic, from the setting, the costumes, the love scenes, the dialogues to the props, allows the viewers to see the film in a realistic perspective. Moreover, the plot structure, which shows the dilemma of a man in choosing between the woman he loves but cannot possess and the woman who merely attracts her but is prepared to be his wife, adds to the realism of the film.The only el ement that seems irrelevant yet not impossible is the time when Joe encounters the mob just before his wedding. This scene is irrelevant to the plot, but may have been added to achieve catharsis. Since Joe is the cause of Alice’s accidental death, he is made to pay for what he does before he marries Susan. Despite the irrelevance of the mob scene to the plot, it nevertheless presents other aspects of the proletarians.As depicted in the film, the men that beat Joe are not scavengers; rather, they are working men, considering the way they are dressed up. Based on this scene, the proletarians in the British society are pictured as ruthless just like the bourgeois who would buy off people’s freedom in order to make their daughter happy. As Joe decides to leave Alice for Susan, the film once again shows that in the face of struggle between the two classes, it is usually those in the upper class that emerge as the winner, leaving behind the poor at the losing end.References Marx, K. & Engels, F. (1848) The manifesto, Available at [Accessed on 23rd July 2009]. Room at the Top (1959) Directed by Jack Clayton, London, British Lion Films [video:DVD]. Strasser, H. & Randall, S. (1981) An introduction to theories of social change. London, Routledge. Wickham, P. (N. d. ). Room at the Top (1958). Available at [Accessed on 23rd July 2009].

Selected Quotations by Amelia Earhart

Amelia Earhart was a pioneer in aviation, and set a number of records for firsts for women. In 1937, her plane disappeared over the Pacific, and while there are theories about what happened to her, there is not certain answer even today. Selected Amelia Earhart Quotations †¢ About her first airplane ride: As soon as we left the ground, I knew I had to fly. †¢ Flying may not be all plain sailing, but the fun of it is worth the price. †¢ After midnight the moon set and I was alone with the stars. I have often said that the lure of flying is the lure of beauty, and I need no other flight to convince me that the reason flyers fly, whether they know it or not, is the esthetic appeal of flying. †¢ Adventure is worthwhile in itself. †¢ The most effective way to do it, is to do it. †¢ I want to do something useful in the world. †¢ Please know that I am quite aware of the hazards. Women must try to do things as men have tried. When they fail, their failure must be but a challenge to others. [Last letter to her husband before her last flight.] †¢ Women must pay for everything. They do get more glory than men for comparable feats. But, they also get more notoriety when they crash. †¢ The effect of having other interests beyond those domestic works well. The more one does and sees and feels, the more one is able to do, and the more genuine may be ones appreciation of fundamental things like home, and love, and understanding companionship. †¢ The woman who can create her own job is the woman who will win fame and fortune. †¢ One of my favorite phobias is that girls, especially those whose tastes arent routine, often dont get a fair break.... It has come down through the generations, an inheritance of age-old customs which produced the corollary that women are bred to timidity. †¢ After all, times are changing and women need the critical stimulus of competition outside the home. A girl must nowaways believe completely in herself as an individual. She must realize at the outset that a woman must do the same job better than a man to get as much credit for it. She must be aware of the various discriminations, both legal and traditional, against women in the business world. †¢ ... now and then women should do for themselves what men have already done -- occasionally what men have not done -- thereby establishing themselves as persons, and perhaps encouraging other women toward greater independence of thought and action. Some such consideration was a contributing reason for my wanting to do what I so much wanted to do. †¢ My ambition is to have this wonderful gift produce practical results for the future of commercial flying and for the women who may want to fly tomorrows planes. †¢ In soloing -- as in other activities -- it is far easier to start something than it is to finish it. †¢ The most difficult thing is the decision to act, the rest is merely tenacity. The fears are paper tigers. You can do anything you decide to do. You can act to change and control your life; and the procedure, the process is its own reward. †¢ Never do things others can do and will do if there are things others cannot do or will not do. †¢ Never interrupt someone doing what you said couldnt be done. †¢ Anticipation, I suppose, sometimes exceeds realization. †¢ There are two kinds of stones, as everyone knows, one of which rolls. †¢ Worry retards reaction and makes clear-cut decisions impossible. †¢ Preparation, I have often said, is rightly two-thirds of any venture. †¢ Amelia is a grand person for such a trip. She is the only woman flyer I would care to make such an expedition with. Because in addition to being a fine companion and pilot, she can take hardship as well as a man -- and work like one. (Fred Noonan, Amelias navigator for the around-the-world flight) †¢ A single act of kindness throws out roots in all directions, and the roots spring up and make new trees. The greatest work that kindness does to others is that it makes them kind themselves. †¢ Better do a good deed near at home than go far away to burn incense. †¢ No kind action ever stops with itself. One kind action leads to another. Good example is followed. A single act of kindness throws out roots in all directions, and the roots spring up and make new trees. The greatest work that kindness does to others is that it makes them kind themselves. †¢ I lay no claim to advancing scientific data other than advancing flying knowledge. I can only say that I do it because I want to. †¢ For the economic structure we have built up is all too often a barrier between the worlds work and the workers. If the younger generation finds the hurdle too absurdly high, I hope it will not hesitate to tear it down and substitute a social order in which the desire to work and learn carries with it the opportunity to do so. †¢ Like many horrid children I loved school, though I never qualified as teachers pet. Perhaps the fact that I was exceedingly fond of reading made me endurable. With a large library to browse in, I spent many hours not bothering anyone after I once learned to read. †¢ It is true that there are no more geographical frontiers to push back, no new lands flowing with milk and honey this side of the moon to promise surcease from man-made ills. But there are economic, political, scientific, and artistic frontiers of the most exciting sort awaiting faith and the spirit of adventure to discover them. †¢ In my life I had come to realize that when things were going very well indeed it was just the time to anticipate trouble. And, conversely, I learned from pleasant experience that at the most despairing crisis, when all looked sour beyond words, some delightful break was apt to lurk just around the corner. †¢ Of course I realized there was a measure of danger. Obviously I faced the possibility of not returning when first I considered going. Once faced and settled there really wasnt any good reason to refer to it. Poem by Amelia Earhart Courage is the price thatLife exacts for granting peace. The soul that knows it notKnows no release from little things:Knows not the livid loneliness of fear,Nor mountain heights where bitter joy can hear the sound of wings. Nor can life grant us boon of living, compensateFor dull gray ugliness and pregnant hateUnless we dareThe souls dominion.Each time we make a choice, we payWith courage to behold the resistless day,And count it fair. Letter from Amelia Earhart to Her Husband In a letter she gave to her future husband, George Palmer Putnam, just before their wedding in 1931, Earhart wrote: You must know again my reluctancy to marry, my feeling that I shatter thereby chances in work which means so much to me. In our life together I shall not hold you to any medieval code of faithfulness to me, nor shall I consider myself bound to you similarly. I may have to keep some place where I can go to be myself now and then, for I cannot guarantee to endure at all times the confinements of even an attractive cage. I must extract a cruel promise, and that is you will let me go in a year if we find no happiness together. About These Quotes Quote collection assembled by Jone Johnson Lewis. Each quotation page in this collection and the entire collection  © Jone Johnson Lewis. This is an informal collection assembled over many years. I regret that I am not be able to provide the original source if it is not listed with the quote. More Women Pilots If youre interested in Amelia Earhart, you might also want to read about Harriet Quimby, first woman licensed as a pilot in the United States; Bessie Coleman, the first African American to earn a pilots license; Sally Ride, the first American woman in space; or Mae Jemison, first African American woman astronaut.   More about women pilots is found in the Women in Aviation  Timeline, and more about women in space in the Women in Space timeline.