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A solid sphere of mass M and radius R is...

A solid sphere of mass M and radius R is covered with a thin shell of mass M. There is no friction between the inner wall of the shell and the sphere. The ball is released from rest, and then it rolls without slipping down an incline that is inclined at an angle `theta` to the horizontal. Find the acceleration of the ball.

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The correct Answer is:
`a = (3 g sin theta)/(4)
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