if a 10 light year long iron rod is placed in space having a mass. if one end of the rod is pushed then when will the another end of the rod moves.????
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When you push one end of a stick, why does the other end move? Because you are moving some of the atoms "forward", which then repel the atoms in front of them, pushing them forward, and so on. This happens very quickly, and so for sticks of a normal length, it seems instantaneous. But, it's not! All influences are constrained to propagate no faster than the speed of light. In this case, the "next atom" doesn't "know" that the previous atom has moved right away; moving an atom changes the electromagnetic field, but that change propagates at the speed of light, not instantaneously.
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