A black disk rotates with constant speed and a coin that is located on the edge of the disk moves with speed v. If on a white disk that also rotates with constant speed, we place the same coin on the edge, it is moving with speed 4v. Which disk has a larger radius?
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Ответ:
Taking moments about O:
W cos theta * 1.18 = P sin theta * (1.18 + .47)
Counterclockwise torque = Clockwise torque
W / P = 1.40 sin theta / cos theta = 1.40 tan theta
Or theta = tan^-1 (.72 W / P)