Re:How to destroy the Earth (completely)
by jules on Monday June 21, 2010 @07:11PM
(#1450382)
Assuming the cave is spherical, each swing will reach the other side, because inside the cave the black hole will not be slowed down, do you agree? So in this perfect situation, it is impossible that the black hole will come to stop exactly in the center. Even if it was stopped exactly in the center, if one atom hits it from one side, the black hole will crash into the other side (but slowly of course).
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I see your point (I didn't before).
There is no force on the black hole, so if it moved at all it would crash into the wall. Only when it actually ate some of the wall would it turn around. So each swing would eat more and more.