Greenwich‚ United Kingdom Discovered: Halley’s Comet Education: The Queen’s College‚ Oxford‚ University of Oxford‚ St Paul’s School‚ London The English astronomer Edmund Halley was a good friend of Isaac Newton. He used Newton’s new theory of gravitation to find the orbits of comets from their recorded positions in the sky as a function of time. He found that the bright comets of 1531‚ 1607‚ and 1682 had almost the same orbits‚ and when he accounted for the gravitational perturbation on the cometary
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gravitational field (such as Earth’s) the object’s acceleration increases and thus the velocity of the object speeds up. It is defined as: Ep = 0 at a distance of infinity. E p = −G m1 m2 r Ep = Gravitational Potential Energy (J) G = Universal Gravitation Constant = 6.67x10-11 m1 = Mass of first object (kg) m2 = Mass of second object – often the Earth (kg) r = distance from the
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weight under gravity experienced in free fall or orbit‚ or to balancing the force of gravity with some other force‚ such as electromagnetism or aerodynamic lift. Anti-gravity is a recurring concept in science fiction. In Newton’s law of universal gravitation‚ gravity was an external force transmitted by unknown means. Under general relativity‚ anti-gravity is impossible except under contrived circumstances. "Anti-gravity" is often used colloquially to refer to devices that look as if they reverse gravity
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The Effects of Gravity There are some people who worry that when they ’re outside‚ if they don ’t keep a good grip on the ground‚ they ’ll just go flinging off into space. They needn ’t really worry about this‚ because gravity generally keeps that sort of thing from happening. The thing is‚ no one is really sure what causes gravity‚ but the effects have been studied by many physicists and astronomers. Three of the more obvious effects of gravity are things falling down‚ weight
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Unit 2: The Ordered Universe Assignment 1. Why was the Ptolemaic system accepted as an explanation of celestial motion for over a thousand years? What did it explain? What system challenged the idea that Earth was the center of the universe? The Ptolemaic system says that the Earth is the center of the universe. Everything else surrounded the Earth. The Copernican system challenged the belief that Earth was the center of the universe. The major difference between the Ptolemaic and Copernican universes
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Stannard P & Williamson K‚ 2007 Science World 3. 2nd edn‚ Macmillan Education Australia Pty Ltd‚ South Yarra Geddes‚ S.M. 1981‚ Advanced Physics: Gravitation - The Acceleration due to Gravity‚ Macmillian Education Limited‚ Hampshire‚ pp. 116-118. Giancoli‚ Douglas C. 1980‚ Physics - Principles with Applications: Circular and Rotational Motion; Gravitation‚ Prentice-Hall‚ Inc.‚ New Jersey‚ pp. 70-73. Kallos 2004‚ ’A Brief History of Gravity ’‚ University of Southern California‚ [Online]‚ Available:
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The Sun and Moon Elizabeth Milam ENG 121: English Composition I Kathy Conner March 5‚ 2012 The Sun and Moon The sun and the moon have both been dated at 46 billion years old. Other than defining time in human experience‚ the sun and moon have very little in common. Their differences range from physical attributes to functions. Since the beginning of civilization‚ both bodies have inspired a fascination in humans. Even though the sun and moon appear to play similar roles‚ they are
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2. the centripetal force ac =v^2r Non-Uniform Circular Motion Vertical Circle Resultant force toward the centre is FNET = FC= mv2r Top: mv2r = mg + Tension Bottom: mv2r = tension - mg Universal Law of Gravitation Everybody in the universe attracts every other body in the universe with a force that is proportional to the product of their masses‚ and inversely proportional to the square of the distance between them. This force acts along the line joining
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Newtons 2nd Law – F = ma: Weight = Mass x Acceleration due to gravity (W = mg) • Gravitational Force of Attraction between 2 bodies: F = Gm1m2 r2 • Note: Universal constant of gravitation = 6.67 x 10-11 Nm2kg-2 Explain that a change in gravitational potential energy is related to work done Work done is the measure of how much energy was used to displace an object a specified distance (W = Fs). When an object is moved away from
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HSC PHYSICS: SPACE * 1. “The Earth has a gravitational field that exerts a force on objects both on and around it.” Students learn to “define weight as the force on an object due to a gravitational field.” Mass is the amount of matter in a body whereas weight is the force due to gravity acting on a mass. Mass will not change where the acceleration due to gravity is different but the weight will change. For example‚ bathroom weights are calibrated in kg‚ but actually measure
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