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A coin of 5.30 gram is placed 12.0 cm from the center of a turntable. The coin has static and kinetic coefficients of friction with the turntable surface of = 0.900 and = 0.470.
What is the maximum angular velocity with which the turntable can spin without the coin sliding?

  • physics -

    The static friction coefficient, Us, determines when it starts sliding.

    M*g*Us = M*R*w^2

    Solve for w, the angular velocity.

    w = sqrt(g*Us/R) = 8.57 rad/s

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