Dynamics coefficient of statics friction HELP ASAP!?

A small coin is placed on the horizontal surface of a rotating platform, as shown in the diagram. The platform starts from rest and is given a constant angular acceleration pheta double dot=alpha.Develop an expression for the total angle pheta, through which the platform turns, before the coin slips. Assume that... show more A small coin is placed on the horizontal surface of a rotating platform, as shown in the diagram. The platform starts from rest and is given a constant angular acceleration pheta double dot=alpha.Develop an expression for the total angle pheta, through which the platform turns, before the coin slips. Assume that the coefficient of static friction between the coin and the platform is u.
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