Physics of Springboard Diving Essay Example for Free

Physics of Springboard Diving Essay What the hurdle does, is first to allow the diver to use the diving board as a slingshot, and second get as much energy as possible out of the slingshot. This is achieved when the diver takes the first leap into the air with his arms raised. When he comes back down on the board, his own mass falling onto the board will apply a certain force. An additional force is added as the arms swing down at the same time with a greater acceleration, applying more force. At the bottom of the diving boards oscillation, all of the now stored potential energy is released. The diver swings his arms upward and begins to release his pressure on the board. The board pushes the diver up and into the air with a huge force. This force now can be used by the diver not only to go up, but to rotate and therefore perform various dives. The Dives and Application To do a front dive a diver pushes his hips upward just slightly as he leaves the board. After he had begun to go up into the air, he throws his arms downward just enough to make is upper torso rotate around his hips. At the peak of the dive, the diver tightens his stomach muscles and pulls his legs up towards the sky, leaving his body in a perfect upside-down position to enter the water head-first. In order to perform a front dive with a somersault, it requires a full flip of the body and therefore it takes a quicker rotation to cover such an angular distance. The diver takes off from the diving board with the same hip motion and arm swing as for a forward dive, but throws the arms further and makes a smaller ball in the air. As is seen in the laws of rotational motion, the divers moment of inertia becomes smaller, but since momentum must be conserved in the system, the angular speed increases to compensate. It is important to note here that the reverse can be applied in order to stop the divers rotation to keep him from doing a belly-flop on the water. To stop his rotation, the diver increases his moment of inertia by straightening his body, conserving momentum again. When a diver goes to jump off of the board backwards, he begins by swinging his arms down with a deep knee bend. Just as in the hurdle, this presses the board down. When the diver lets the diving board recoil, he does two things at the same time: He swings his arms back up and jumps up. The board assists the diver just as in the hurdle and he has the ability to put this new energy to use. To do a back dive, the diver pushes his hips up as he leaves the board. Once airborne, he leans back and pulls his hips upward even more, generating just enough rotation to go into the water headfirst. To do a back dive with a somersault, the diver pulls his hips upward while leaving the board. As the rotation begins, he swings his arms around and grabs his knees to make himself smaller. Again, just as is accomplished with the front dive with a somersault, the moment of inertia is made smaller and the angular speed increases to make enough spin that is needed to complete the somersault. Reverse Dives You would think that there was a similar technique between performing a back dive and a reverse dive, which is true. A forward hurdle is applied before the dive, but when the diver leaves the board, he pushes his hips upward and leans back enough to create a backwards rotation and enter the water head first. Again, just like the back dive with a somersault, the same laws of physics allow for a diver to perform a reverse dive with one-and-a-half somersaults and enter the water headfirst. A smaller moment of inertia leads to a greater angular speed. Inward Dives Although the take-off for an inward dive is like that of a back dive, the techniques used in the air are exactly like those that are used to perform a front dive. Twisting Dives The front dive with one somersault and one twist can appear to be tricky, but it involves the same conservation of momentum as the other dives, only along two axis of rotation. When the diver takes off from the board, he begins his flipping rotation by throwing his upper body down towards his legs. Next, he unfolds while rapidly wrapping his arms about his body. This begins the twisting motion. From here, all the diver has to do is figure out what his orientation in the air is in order to know when to straighten his body to counter the flip and when to unwrap his arms to counter the twist before entering the water.

violence :: essays research papers

In the fictional short story â€Å"The Child by Tiger† no event occurs with out purpose. Authors of fictional short stories have to produce a well-read piece without any excess information or events. Thomas Wolfe was no exception to this rule. He demonstrated a serious fictional short story without any overflow of information or detail. An act of violence in a story provides suspense, drama, mystery, and other specific advantages. Wolfe also displays the result of violent acts, especially in small towns. In â€Å"The Child by Tiger† Dick’s violent act seems both shocking and surprising, but offers and excellent gateway to wrap up the end of a story. The violent act of Dick Prosser, the Shepperton’s servant presents the story with a great crescendo of conflict and suspense. This kind, gentle, respectful man changed suddenly into a cold-blooded killer. The purpose of this violence in the story was to show the reader the need for Dick to be free. Literally, he was free, but because of his position as the Shepperton’s â€Å"Negro man† he was not. He even went as far as to kill people just so he could live his own life. Without the author’s use of violence Dick’s point would not be made as boldly. If he had talked to Mr. Shepperton about his desire to live his own life, it would not have made such an impression on the readers as it did when he became violent. Also, if Dick did in fact speak to Mr. Shepperton about his desire to live his own life and if it was granted to him the story would have had a nice moral, but not offer the same excitement and drama as it did. The reader can also assume that if he was â€Å"freed† that he would have a difficult time trying to find employment and respect because this story takes place about 1937. Another interesting fact bout â€Å"the Child by Tiger† was that Thomas Wolfe provided subtle, yet imperative, foreshadowing to the readers. Throughout the story, a reader could have a feeling that something exciting should be happening but could never be exactly sure. The narrator described Dick as having a muscular build, and when throwing the football he aimed it over his outstretched hands â€Å"as if he were pointing a gun.† We find out that later in the story he does in fact use a gun as a means to try to â€Å"free† himself by killing and injuring several people, before running out of town.

Are genetically modified foods safe to eat? Essay

Nowadays, genetically modified crops are planted worldwide. According to Human Genome Project, over 10 million farmers in 22 countries are planting genetically modified crops on the fields. The total acreage has reached a quarter billion (2011). Apparently, genetically modified foods have prominent benefits so that more and more people are planting them and eating them. Genetically modified plants are able to resist pests and certain kinds of diseases as well as tolerant cold and drought because scientists move specific foreign genes into the plants. Therefore, world crop productivity increaseds by 25 percent by planting genetically modified crops. Specifically, Iin United States, after the crops were genetically modified, six kinds of crops were able to produce 4 billion pounds more compared to the past than before without having to increaseing any acreage for planting (Deal & Baird, 2003). As the problem of food insufficiency is getting increasingly more and more serious, the appearance of genetically modified foods may successfully alleviate this crisis. Besides, scientists are able to add more some nutrition in genetically modified foods. According to Lerner, genetically modified foods contain more and more nutrition. For example, Sseveral healthy fatty acids are added in canola oil. DHA omega-3, which is beneficial to cardiovascular health, is in genetically modified foods as well (2009). This article will prove that genetically modified foods are safe enough to eat in three different kinds of approaches: logic approach, science evidences approach, and reality evidences approach. First, logically speaking, genetic modification technique is an improvement in the real world, and any applications of new techniques needs a process from immaturitye to maturitye. For example, the development of the airplane went through a lot of difficulty. An aviator Thomas E. Selfridge died because of the airplane crash accident in 1908. Things also happened to spaceships. On January 28, 1986, the Challenger exploded and killed all of the seven astronauts in it. After these tragedies happened, no one said we should stop developing airplanes or spaceships. Genetic modification technique is as mature as airplane technique that has gone through one hundred years of modification ago and more mature than the thirty years old or spaceship developmenttechnique thirty years ago. Theis genetic modification technique is even safer because no devastating event has happened yet. Now that we accept astronauts getting into spaceships which are not one hundred percent safe, we can accept genetically modified foods which seem to be safe for now. In addition, the plants that exist in nature are not all good. Our ancestors tried and selected things that are edible to human can eat as foods, and planted the crops which produced foods. Farmers use cross breeding technology in order to get more productive crops. That is how seedless watermelons are created. According to the high school biology textbook, first, give a normal watermelon seedling colchicine, which is a chemical. The normal watermelon plant will become a tetraploid watermelon plant, which doubles its chromosome and has four sets of chromosomes. Then cross breed the tetraploid and a normal one. Their offspring is a triploid, which has three sets of chromosomes and the watermelon results in being seedlessdoes not have seeds. Genetic modification is just a more advanced technology to create productive crops that also provide convenience. It means iIf people accept seedless watermelon, people can accept genetically modified foods. The second approach is scientific evidence approach. Ggenetically modified foods are the foods that have added by a foreign genes or genes on purpose. Scientists add those foreign genes into the original plants to make them have some good traits including disease resistance, pest resistance, cold tolerance and drought tolerance. However, these changes do not make any difference in their essence as foods. According to University of Guelph website, the concept of, substantial equivalence, means one kind of food can be seen as the other kind of food. After several tests, genetically modified foods are said to be substantial equivalent, meaning that genetically modified foods is the same as other regular foods when used as human foods (2013). Before a genetically modified food can get access to supermarkets, it must pass a whole bunch of tests. These tests involve protein level tests, which test whether the genes of the genetically modified plants can express any harmful protein, and individual level tests, which test whether animals perform normally after eating this genetically modified food. Also, scientists analyze DNA to detect whether the new added DNA sequence will cause any unintended effect (Kuiper, et al. 2001). Only if the genetically modified food has none of these problems, customers can find it in supermarkets. Maybe it sounds simple, but in fact, it is very complicated in practice. Take vivo testing as an example. Right before a genetically modified food comes into supermarkets, it has to pass vivo testing. First, they use mice to do animal tests for ninety days. If the tests show this genetically modified food can use as human food. Then they do the next several stages of tests. They use more and more human volunteers to do the tests for longer and longer time. If any experiments fail, this food will never be human food (Fagan). Even if it passes all the tests, for some cases, it takes as long as ten years for it to be able to come into supermarkets. Last but not least, in reality, no evidence supports the point of view that genetically modified foods are harmful for human beings. People on the opposite side use failures of some laboratory experiments as arguments. However, those failed experiments are proved to be under questioning conditions. People who conduct the experiments forced the rats to eat only one kind of genetically modified food for several days (Deal & Baird, 2003). Under this condition, those rats turning out unhealthy or died cannot prove anything. Some genetically modified foods do cause allergy reaction, though. Transgenic soybeans, which contain the genes from an allergenic food, Brazil nut, cause allergy reactions. This event arouses heated discussion in public. However, the discussion is about whether producers should label genetically modified foods, but not whether genetically modified foods are safe or not. Still, America and Europe have forbidden using the gene from Brazil nut as a foreign gene in genetically modified foods. More over, United Nation agencies are keeping their eyes on these typetypes of events. Once they realize risks of allergies exist, they document the risks and notify the public to be careful (Food allergy 2001). This case shows that if any problem occurs, it is fixable. Therefore, the genetically modified foods that people can buy in the supermarkets are safe to eat. To sum up, genetically modified foods are safe to eat in all of the logical sense, scientific sense, and reality sense. Genetically modified foods are the results of advanced biology technology. Scientific evidences prove that the modified foods are safe to eat make sure of their safety.

The Characters Of Hubris In Oedipus The King - 1032 Words

Hubris is one characteristic of humans that leads to people committing evil deeds. In the play Oedipus the King, Oedipus struggles with facing the truth about his fate. His hubris leads him to be an arrogant and ignorant person throughout the play. Hubris also leads Oedipus to lose control over his emotions on multiple occasions in the story. In Sophocles’ play, Oedipus the King, Oedipus’ character flaws clearly outweigh his positive qualities. Oedipus’ rage, pride, and ignorance are the main character flaws that outweigh his positive flaws. Primarily, one of Oedipus’ character flaws is his rage. Oedipus’ rage is a big character flaw because this is one of the principles that lead to his downfall. One example of his rage was when he is†¦show more content†¦More importantly, Oedipus realized that it was his pride that lead him to kill King Laius. Moreover, another example of Oedipus’ hubris is when he accuses Creon of plotting to ove rthrow him. â€Å"Creon, the soul of trust, my loyal friend from the start steals against me...so hungry to overthrow me he sets his wizard on me, this scheming quack, this fortune-teller peddling lies, eyes peeled for his own profit-seer blind in his craft!† (279). To put it differently, Oedipus is saying that Creon wants to steal the throne and he will go as far to consult an oracle to come and deceive Oedipus. This example is of great importance because it is Oedipus’ pride that causes him to accuses Creon of trying to steal his throne. Lastly, Oedipus’ ignorance leads to his downfall. Oedipus’ ignorance is important because this means that Oedipus is unwilling to accept the truth about his fate. First, we see Oedipus’ ignorance when Tiresias expresses that Oedipus is blind for not seeing reality. â€Å"So, you mock my blindness? Let me tell you this. You with your precious eyes, youre blind to the corruption of your life, to the house you liv e in, those you live with-who are your parents? Do you know? All unknowing you are the scourge of your own flesh and blood, the dead below the earth and the living here above, and the double lash of your mother and your fathers curse will whip youShow MoreRelatedCompare Odysseus and Oedipus Essay1739 Words   |  7 PagesOdysseus and Oedipus There are many legendary epic stories have been passed on from generation to generation in the Greek culture. Even though each story has different outcomes, every epic character has certain features in common. Odysseus in The Odyssesy and Oedipus in Oedipus the King are great examples of epic heroes with a variety of similarities. Odysseus and Oedipus are similar in which they both god-like men who are considered heroes because of their cautious ways and relentless tenacityRead MoreThe Tragic Downfall Of Oedipus The King By Sophocles924 Words   |  4 Pagesworld of greek literature, characters often have flaws that lead to a tragic downfall. One of these tragic flaws is hubris, which is defined as â€Å"exaggerated pride or self-confidence† (Merriam-Webster). This trait is most commonly found in characters who come to power and allow themselves to be consumed by their newfound hierarchy. The play Oedipus the King by Sophocles embodies the trait and displays it in different ways throughout the story. Oedipus is a victim of hubris as seen when he disregardsRead MoreOedipus Downfall Essay example774 Words   |  4 PagesPrompt: In a well-developed essay, consider whether hubris, fate or both are the use of Oedipus’ downfall. Use evidence from the text to support your support. Hubris is defined as excessive pride or self-confidence, while fate is defined as the supposed force, principle, or power that predetermines events. Ancient Greeks believed in Hubris, or pride. Pride may have been seen as good or bad. Many people that exhibit pride may come off as being proud of their achievements or lives; however, prideRead More Discuss the ways in which the character of Oedipus in Oedipus the King1192 Words   |  5 PagesDiscuss the ways in which the character of Oedipus in Oedipus the King conforms to the conventions of the tragic hero. In your discussion refer to how the issues explored in the play have a wider significance than the tragedy of Oedipus as an individual. Assessment 9: Short Essay – Drama Discuss the ways in which the character of Oedipus in Oedipus the King conforms to the conventions of the tragic hero. In your discussion refer to how the issues explored in the play have a wider significance Read MoreOedipus : The King Of Thebes And Tragic Hero Essay728 Words   |  3 PagesOedipus: The King of Thebes and Tragic Hero Ancient Greek Literature encompasses an assortment of poetry and drama to include the great masterpieces of tragedy. In Classic Literature, tragedies were commonly known for their elaboration of a protagonist fitting the classification of a tragic hero. This type of a tragic hero often collectively described as a character of noble birth, facing an adversity of some nature and a fate of great suffering. The characteristics of what encompassed a tragic heroRead MoreEssay on The Arrogance and Hubris of Oedipus and Creon724 Words   |  3 Pagescan analysis the character of Creon they would first have to look at the story of Oedipus the King. In Oedipus the King, a plague has fallen upon the city of Thebes. Forced to take action Oedipus sends Creon to the oracle in Delphi to rid the city of this plague. Creon returns with the message, the plague will end when the murderer of Laius, the former king of Thebes, is caught and expelled; the murderer is within the city. Tiresias tells Oedipus that he is the murderer. Oedipus accuses both CreonRead MoreThe Perfect Aristotelian Tragedy: Sophocles Oedipus the King918 Words   |  4 Pagesconsidered Sophocles Oedipus the King to be a nearly perfect example of Greek tragedy. His reasons were based on the structural perfection of the play, in which the protagonists recognition of his circumstances (anagnorisis) comes at the same moment as his reversal of fortune (peripeteia). But the terms whereby Aristotle defines character in Greek tragedy are slightly harder to work out where is the hubris of Oedipus? An examination of the plot will demonstrate that Oedipus hubris is manifest in theRead MoreEssay on Hubris in Oedipus the King by Sophocles766 Words   |  4 Pages There are many historic and fictional figures where hubris led to their downfall. Hubris is defined as being arrogant and having pride for your self. There are many people that are led to their downfall because of hubris. People that are hubris are blinded and can’t see what they did wrong. Those who contain hubris only think about themselves and can’t see the big picture. They think the world revolves around them and think they are the best. They are always going to be successful but suddenlyRead MoreThe Theme of Hubris in Ancient Greek Mythology and Literature681 Words   |  3 PagesHubris is a very popular theme in Greek mythology. Hubris was a very important moral concept to the Greeks. Committing hubris was a very serious crime. Hubris is defined as having extreme pride or arrogance. Pride became hubris when it became all consuming or hurtful to others. Other actions that were seen as hubris were acting as if you were equal or more powerful than the gods, or try ing to defy them. Hubris was a severe crime that deserved a serious punishment, and it was the downfall of manyRead MorePride And Stubbornness In Oedipus Rex And Antigone By Sophocles1111 Words   |  5 Pagesdifferent character flaws. In Sophocles’ Oedipus Rex and Antigone, pride and stubbornness obstruct the senses of Oedipus and Creon in a classic play about seeing the truth. Sophocles delves into the meaning of seeing, in a conventional way, and also in terms of insight. Pride in itself is a good character trait: pride in your country; pride in your heritage; pride in yourself. However, excessive pride, hubris, can lead to stubbornness and often actions in violation to the Gods. Oedipus was royalty