Physics of Skydiving :: physics parachute skydiver sky dive

Could you see yourself jumping out of a perfectly good airplane traveling at 170 MPH 13,000 feet above the ground? Imagine being the first person to jump out of an airplane, entrusting your life to an unproven piece to technology. Over the past century, skydiving has grown from a madman's fantasy to a international sport. As a skydiver stands at the door of the airplane, the force of their mass multiplied by gravity is directly countered by the force of the plane pushing back up on their feet, this is know as the normal force and is shown is the equation FN = m * g As soon as the the diver exits the plane, the normal force is removed and the diver begins to fall. Generally, a skydiver will exit the airplane at about 13,000 feet (4000 meters). To maintain a stable flight, their body must face the "relative wind". This is the direction in which the greatest air resistance is coming from. After a jumper exits, the drag force of the air counteracts the jumper's horizontal motion until the drag is only working against gravity. For a 70 kg jumper with the acceleration of gravity (9,8 m/s2), the force of gravity can be calculated with the same equation as the normal force: Fg = 70 * 9.8 = 686 Newtons The force of the drag caused by particles of air is calculated by this equation with: FD=1/2 * CDr * v2 * A FD: force of drag CDr: coefficent of drag v: velocity A: surface area of the jumper When we set the FD equal to the Force of gravity on the diver and use the drag coefficient for the density of air and use the area of a diver in the "arch" position we find that the diver find a balance of forces (no acceleration) at about 55 m/s. When a skydiver wants to deploy their parachute, the most commonly used device used is a manually-operated pilot chute. The diver will reach back into their rig and grab a handle or small bean bag connected to the pilot chute and throw it away from them. The small pilot chute is affected by an extra drag force attempting to keep it stationary. When this force and the force of the falling diver create enough tension in the line connected to the pilot chute, the deployment bag containing the main canopy is unstowed. If the main canopy were to expand to full size immediately, the tensile forces between the diver and the main canopy would most likely kill the diver and/or break the lines.

Reunion Analytic Essay Essay

â€Å"Reunion† is a short story written by John Cheever in 1962, who was an American novelist and short story writer. John often writes about stories taking place in the suburbs, in cities close to where he was born1. â€Å"Living with strangers† is a story written by Siri Hustvedt, who also is an American novelist and essayist2. â€Å"Reunion† takes place in the suburb in New York, where the young boy Charlie, who is the narrator in the story, meets his father after several years of separation. Charlie’s thoughts about his father are very positive, â€Å"He was a big, good-looking man and I was terribly happy to see him again.† (p.1 l.12-13). The father seems to be a very busy business man, â€Å"His secretary wrote to say that he would meet me at the information booth at noon† (p.1 l.7-8), it is not his dad who is replying, which may indicate that his father does not put so much effort in meeting his soon, like Charlie does in meeting his old dad. Charlie is so happy to see his dad, â€Å"I wished that we could be photographed† (p.1 l.18), and he does not want to forget this moment, he is very proud of his dad. Charlie must be in his late teenage years and approximately 17 years old, in the fact that he can travel on his own and he is not allowed to drink. In this age, boys tend to look up to their parents, especially their dad. It seems like Charlie’s role model is his father, and that is not uncommon in his age â€Å"I knew that when I was grown I would be something like him; I would have to plan my campaigns within his limitations† (p.1 l. 11-12), given these facts, it seems like Charlie has planned his future after his father’s life, so that emphasizes that his father is his role model. Despite Charlie’s age, the father wants to have a beer with him. Charlie agrees to that, because he trusts his dad and everything he does is right and must not be questioned. In every society and culture, there are some unwritten rules and norms, which you have to follow. â€Å"Chop-chop. Then he clapped his hands†, an unwritten rule is e.g. that you never clap for the waiters attention. Charlie’s father’s behavior is very immature and it shows  his arrogance towards other people, people in the lower end of the society. But is does not seem like Charlie is effected by his way of acting. It is like Charlie is using the phrase from the story â€Å"Living with Strangers† – â€Å"Pretend like it isn’t happening† (p.1 l.21). His way of seeing his father, is affected of his high expectations of his role model. â€Å"His boisterousness in the empty restaurant seemed out of place†, Charlie knows that his father is not acting in a normal way, but he does not say anything about his behavior, maybe because he does not want to argue with his father. After entering plenty of restaurants, only to get a beer, â€Å"He put his arm around me and pressed me against him. â€Å"I’ll walk you back to the station. If there had only been time to go up to my club† (p.2 l.73-75), his father uses his valuable time with his son, running after a beer in various restaurants and acting in an unacceptable way. People on the restaurants is not paying attention to them, because like in â€Å"Living with strangers†, â€Å"Nobody else had given the woman a first glance, much less a second† (p.1 l.30-31), this is part of the pretend-like-isn’t-happening law. In â€Å"Living with strangers† it says â€Å"And acting, as everyone in the city knows, can be dangerous† (p.2 l.50-51), maybe the father would have acted very dangerously, if people would had said something to him about his behavior, but no one seems to take that chance. At the end of the story, Charlie tries to say goodbye to his dad, but he is arguing with a guy at the newsstand â€Å"Now just wait a second, sonny,† he said â€Å"Just wait a second. I want to get a rise out of this chap.† (p.2 l.83-84). Even at the very end, the father acts in an unacceptable way. The son had to catch his train and went down the stairs, while the father argued over a newspaper. What is the message of this story? Do we have to expect nothing and then you won’t be disappointed? The shortcomings about his dad and the preconceived view about him and how he has evolved, have given him unrealistic pictures about his father and ended with a big disappointment. Compared to the message in â€Å"Living with strangers†, â€Å"don’t judge a book by its cover†, this can also be used on Reunion. If Charlie did not judge his father on his looks, maybe he would have got another view on him. So in short terms, if he did not have expectation s – he would not get  disappointed. Urkund has received the document – Analytical Essay – Reunion.docx – 03-09-2014 23:10:00. It was sent from simonhvarre@hotmail.com to lol.eucn@analys.urkund.se. The document has been allocated a reference ID – D11417005.

Analysis Of Richard D. Mohr s Prejudice And...

â€Å"Prejudice and Homosexuality†, by Richard D. Mohr, is an essay about how gays and lesbians are subject to discrimination because of different beliefs. Mohr says that when we are evaluating the morality of behavior is to be prescriptive, or normative, not descriptive. In this essay, Mohr says that â€Å"Gays are discriminated against in several ways, including private-sector employment, housing, public accommodations, insurance of all types, custody, adoption, and zoning regulations that bar ‘singles’ or ‘nonrelated’ couples from living together† (Mackinnon 246). I completely agree with him. A descriptive sense of morality is taking the term â€Å"morality† at face value and establishing what is immoral/moral. Mohr says that when either condemning, or praising, behaviors, we should all be normative/prescriptive. This being said, gays are discriminated against because according to the descriptive sense of morality, it is justified. In this sense, morality is defined as what goes against a society’s values — like its norms, mores, and customs. Mohr gives a great example of these two senses of morality; he uses the Nazi society to show that even though a lot of people believe in something, does not make it normatively moral. A correct way to scrutinize behavior, in the normative sense, says that one needs to be consistent and fair. In Mohr’s essay there are one major aspect, with two parts, that fuel the hate fire against homosexuality. This aspect is religion. The first part of religionShow MoreRelatedPrejudice And Homosexuality And Sexual Love And Moral Experience1161 Words   |  5 PagesIsaiah Hines Phil. 2306-43430 05/14/2015 Prejudice and Homosexuality Sexual Love and Moral Experience For many years homosexuality and sex with out marriage has been condemned and debated most with in America . In all standards, homosexual men and women have been denied many rights within the land of the free and home of the brave. And if they have a(n) desire to want to be in the military then they are supposed to withhold their sexual orientation and preference, since this particular