Cylinder Torch
Posted by admin on Monday, November 22, 2010 · Leave a Comment
Torch and String Question?
A torch on the end of a piece of string, in the centre of a cylinder, is spinning round at the speed of light. At what speed is the light from the torch hitting the inside wall of the cylinder, if light can not go faster than186,000mp/second. Surely, it would be travelling faster than this, if the point at which the torch was spinning was already travelling at the speed of light?
The light hitting the cylinder is also traveling at the speed of light...If you had a stopwatch that could measure incredibly small fractions of time, you would find that when you started the experiment, no light had hit the inside of the cylinder yet. A small fraction of time later, the light would have finally traveled to the inside surface of the cylinder, and it would appear illuminated...
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