Posted by **jaeny** on Thursday, March 29, 2012 at 7:58pm.

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 -
**drwls**, Thursday, March 29, 2012 at 8:05pm
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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