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Jun26-05, 01:37 PM
Sci Advisor
PF Gold
Janus's Avatar
P: 2,361
There is no such thing as a perfectly rigid object. The rod will compress when you push it and that compression will travel the length of the rod at the speed of sound for the rod's material (at less than the speed of light), until it reaches the end and uncompresses. Net effect, you push your end, and at sometime later the other end of the rod moves. the time delay between the movement of the ends of the rod will always be longer than it would take for light to traverse the length of the rod.