Some time ago I asked if there was a long pole between 2 stars, and somehow I managed to pull on one end, would someone on the other star, say 3 light years away, feel it pull at the same time? Or would they have to wait a few years?
Someone said no because of 'rigidity' and the speed at which waves of atoms pull on each other. Nothing pulls instantaneously.
Ok, therefore if you was in the middle of the two stars and you was pulling the pole backwards and forwards from the middle, the pole atoms would surely be compressing on one side of your hand, and expanding on the other side (before the pole is seen to move). Is there a formulae to work out how far the atoms in a pole (for example) would compress or expand before there is movement? Putting it another way, suppose you was pushing or pulling a 20cm long pencil (say in a vacuum without gravity to remove effects of resistance), whats the formuale to work out how long it would take for it to move, after the initial push or pull?
2006-06-21
09:14:23
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3 answers
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asked by
liquid_ice_71
2
in
Physics