posted by Physics .
(b)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 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?
im completely comfused by this one
do i need to use angular speed somehow?
set centripetal force to equal friction force.
Yes, angular speed is going to be used.