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A car has wheels with exactly 1m of circumference and travels at constant relativistic speed with ##\gamma = 2## in an horizontal rectilinear road between two points A and B marked on the road itself and separated from a distance of 8 m, as measured from a frame of refence which is still with respect of the road (so it's the "proper distance" between A and B).
Assuming that the wheels can resist the centrifugal forces and that they don't expand because of those forces (it's not a realistic car, of course), how many rotations do the wheels make from the mark A to the mark B?
To measure that number of rotations one can simply mark a red point on a wheel's circumference and see how many times that point comes in contact with the road, assuming it's in contact with the mark A at t = 0.
Edit: the wheel have exactly 1 m of circumference at car stationary on the road, before starting the engine.
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Assuming that the wheels can resist the centrifugal forces and that they don't expand because of those forces (it's not a realistic car, of course), how many rotations do the wheels make from the mark A to the mark B?
To measure that number of rotations one can simply mark a red point on a wheel's circumference and see how many times that point comes in contact with the road, assuming it's in contact with the mark A at t = 0.
Edit: the wheel have exactly 1 m of circumference at car stationary on the road, before starting the engine.
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lightarrow
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