Physics 1 Problem Solutions 133

Physics 1 Problem Solutions 133 - Chapt. 14 Gravity 129 014...

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Unformatted text preview: Chapt. 14 Gravity 129 014 qmult 00900 1 1 4 easy memory: black holes 37. A black hole is a compact celestial object with a gravity field close to the object that is so intense that general relativity must be used to describe the field: classical Newtonian gravity fails. The black hole theory is our best theory for many compact objects observed in space. But it is not certain that black holes actually exist. The defining characteristic of a black hole in the minds of most people is the . This is surface enclosing the black hole from which light cannot escape. Anything from below the cannot escape. Anything that falls to within the is lost to the outer universe forever at least as it was. The energy content of a black hole is thought to leak away as Hawking radiation. If this theory is true black holes eventually evaporate to nothing, but on a very long time scale. The bigger the black hole the longer it takes to evaporate. The estimated lifetime of a solar mass black hole (with no mass additions) is about 3...
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