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A coin is placed 11.0 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turntable until a rate of 31 rpm is reached, at which point the coin slides off. What is the coefficient of static friction between the coin and the turntable?

  • Physics -

    forcefriction=mg*mu
    centripetalforce= mw^2r
    w= 31*2PI/60 in rad/sec
    set them equal, solve for mu.

  • Physics -

    wouldnt w be 2pir/period in s

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