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Chris Carson asked the Naked Scientists: Hi, I love your show!Consider a steel shaft with a hand crank on one end (for example, the composition and the means for rotating it is irrelevant), you turn that shaft and the other end (appears) to turn at the same time. Now consider a shaft of, oh lets say 1 light year, in length. If you crank the shaft at one end, does the far end (one light year away) turn instantly at the same time, or does turning the shaft propagate at a finite rate? If so, what is that rate? The speed of light?Cheers Chris (from Canberra Australia)What do you think?
Give me a lever long enough and a fulcrum on which to place it, and I shall move the world.
If you crank the shaft at one end, does the far end (one light year away) turn?