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Copy of Copy of History of Classical Gravitation Theory and General Relativity

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Jordan Hargis

on 2 December 2010

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Transcript of Copy of Copy of History of Classical Gravitation Theory and General Relativity

History of Classical Gravitation
Theory and General Relativity 1)Aristotle, Galileo, and Keplers' views of gravity and motion of the planets Aristotle believed that Earth was the center of the universe and that everything else orbited around it in perfect circles. He also believed strongly that Earth was motionless itself. Aristotle's View Galileo Galileo did not help much with theoretical discoverings, but he did fing something very important about gravity and falling objects. Through his experiments he found that all objects without air resistance fall with a constant acceleration of -9.8 m/s due to the force of gravity. 2 Kepler's View Johannes Kepler stated that the sun was at the center of the universe and that all objects orbited around it in the shape of elipses. This was a major transition for physics and still is today. 6)Schwarzschild Radius In 1915 Karl Schwarzschild stated that this radius was the distance from the center of an object such that, if all the mass was squeezed into that section, the speed of escape would be equal to the speed of light. 7)Black Holes A black hole is a volume in a point of infinte density (gravitational singularity) in which no objects or light can escape. A mass so compact that it cannot reflect any light hinting the name "black hole". Many people doubted they were even real until one was experienced in the 20th century. To become a black hole, an object must be compressed within an area smaller than its Schwarzschild radius 10) General Relativity General relativity is the current description of gravitation in physics by the famous Isaac Newton. Many predictions have been formed that are significantly different from those of classic physics, but a handful have been confirmed including gravitational time dilation, the gravitational redshift of light, and gravitational time delay 3)What was the major contribution of Henry Cavendish to the Universal Law of Gravitation? Describe his primary experiment. Henry Cavendish realized that finding G, constant of proportionality, would help him find the mass of the earth. He said that once G was obtained he could obtain the gravitational acceleration of the Earth's surface. He said that he then could obtain the Sun's mass from the size of the Earth's orbit. 8)Gravity Bending Light and Gravitational Lensing 2)Life and Times of Isaac Newton and His Contribution to the Theory of Gravity Issac newton lived from 1642-1727 and was born prematurely on Christmas day. At the age of three he was sent to live with his grandmother so his mother could start a new life with her new husband. After Newton reached adulthood he tried farming and failed which led him to return to school and eventually attend Cambridge. Contributions include infinitesimal calculus, new theory of light and color , and the three laws of motion. 4)The Role of Inertial and Gravitational Properties of Mass Equivalence in the Development of General Relativity. Inertial and gravitational properties affect the acceleration of objects in the presence of an applied force and therefore must be equal to maintain smooth paths of travel. 5)How Gravity Corresponds to the Bending of the Space-Time Fabric. Gravity acts on the fabric of space by stretching the space surrounding an object downward at a negative slope , resulting in other objects being pulled or " rolling down" to the larger object Gravity bends light by using gravitational lensing. Gravitational lensing is where something very large takes the light from something farther away and bends the light coming from it and focuses it at us. 9)Worm Holes A wormhole is a pathway from one part of space and time to another one. Wormholes are strictly based on scientist theories and are not believed to be real. Sources:
Hayden - Trubin, Julian. "Henry Cavendish: Weighing the Earth." The Orchid Grower: A Juvenile Science Adventure Novel. Web. 01 Dec. 2010. <http://www.juliantrubin.com/bigten/cavendishg.html>.

This source helped me very much with my overall contribution to the project. Without this source I would not have been able to gather as much information as I did. I am very thankful for this source. Jordan - "Schwarzschild Radius." Wikipedia, the Free Encyclopedia. Web. 02 Dec. 2010. <http://en.wikipedia.org/wiki/Schwarzschild_radius>.

This specific resource contained an abundance of information about what exactly the Scwarzschild Radius is. It went into great depth about what exactly it was, who discovered, and when. What I gained from this website was that if an objects mass was compacted into an area so dense that it would eventually collapse and no light or objects for that matter could escape from it. The Schwarzschild Radius is the radius that the specific object must be equal to or lesser than for this phenomenon to occur. There is also a formula for finding it and that would be r=2Gm/c*c.
These bewilderments are known as black holes and occur rarely. It then went on into things that weren't as important to me including its history. It also gave several examples of different types of black holes which didn't really pertain to the task at hand, but I did find it very interesting. Without the help of this website I would have no clue what the Scwarzsghild Radius is. Bill - PBS: Public Broadcasting Service. Web. 02 Dec. 2010. <http://www.pbs.org/>. Key: Work Hayden - Bracket Border Jordan - Filled-in Border Bill - Hidden Border THE END:)
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