How Does a Bowling Ball Accelerate Up a Ramp?

[cuman12]

A bowling ball rolls without slipping up a ramp that slopes upward at an angle beta to the horizontal. Treat the ball as a uniform, solid sphere, ignoring the finger holes.

What is the acceleration of the center of mass of the ball?
Express your answer in terms of the variable beta and appropriate constants.

I got this part:
gsinB/(7/5)

What minimum coefficient of static friction is needed to prevent slipping?
Express your answer in terms of the variable beta and appropriate constants.

Any suggestions for this part?

 

[hikaru1221]

If you got the acceleration of C (center of mass), you should be able to calculate the normal force N and the frictional force F, right? We have $$\mu _{static}\geq F/N$$, and you get the minimum static friction coefficient.