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General relativity and Its applications - UoN Repository
General relativity and Its applications - UoN Repository

... Nairobi, Dr. Ogana, Prof. Singh, Dr Nyandwi, Dr. Were, whose good teaching has enriched my interest in the academic pursuits. I thank Dr. Moindi for going through my project and making very relevant comments. Worth special mention is my classmates Violet and Fedli for the good company. I wish you al ...
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... • Things have charge. This causes things to be attracted to and repelled by other things. This is called the electric force. It is one of four fundamental forces in nature (along with gravity, the weak force, and the strong force). Charge is labeled by q and has units of Coulombs. • Charge flowing t ...
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< 1 ... 174 175 176 177 178 179 180 181 182 ... 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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