Homework Help: physics

Posted by anan on Monday, July 26, 2010 at 5:20am.

A coin is placed 20 cm from the axis of a rotating turntable of variable speed. This speed is gradually increased and the coin remains fixed on the horizontal turntable until a rate of 36 rpm is reached. At this point, the coin slides off. What is the coefficient of static friction between the coin and the turntable?

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