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Module 11
Module 11

Keck Lobby Brochure
Keck Lobby Brochure

... in 1916 is the foundation for his theory of gravity, the theory of general relativity. The equation relates the geometrical curvature of space-time to the energy density of matter. The theory constructs an entirely new picture of space and time, out of which gravity emerges in the form of geometry a ...
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Laplace and the Speed of Gravity - Physics Department, Princeton

... Hence, Maxwell considered such a theory to be nonphysical. Much later, Einstein gave a 4-tensor theory of gravity [11] in which all masses attract and the issue of negative field energy is (largely) evaded. A weak-field approximation to Einstein’s theory can be expressed in terms of a 4-vector potenti ...
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The Speed of Light - HRSBSTAFF Home Page

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... 50. In a closed, isolated system, energy can neither be created nor destroyed. 51. The kinetic energy is transformed into heating the wheels, tires, and road. 52. The apple would appear black because a red apple can only reflect red light. The green light is absorbed by the apple and no light is ref ...
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< 1 ... 164 165 166 167 168 169 170 171 172 ... 196 >

Anti-gravity

Anti-gravity is an idea of creating a place or object that is free from the force of gravity. It does not refer to the lack of 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, particularly in the context of spacecraft propulsion. An early example is the gravity blocking substance ""Cavorite"" in H. G. Wells' The First Men in the Moon.In Newton's law of universal gravitation, gravity was an external force transmitted by unknown means. In the 20th century, Newton's model was replaced by general relativity where gravity is not a force but the result of the geometry of spacetime. Under general relativity, anti-gravity is impossible except under contrived circumstances. Quantum physicists have postulated the existence of gravitons, a set of massless elementary particles that transmit the force, and the possibility of creating or destroying these is unclear.""Anti-gravity"" is often used colloquially to refer to devices that look as if they reverse gravity even though they operate through other means, such as lifters, which fly in the air by using electromagnetic fields.
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