What is the magnitude of the frictional force on the sphere

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A solid sphere of uniform density starts from rest and rolls without slipping down an inclined plane with angle ? = 30.0o. The sphere has mass M = 8.0 kg and radius R = 0.19 m . The coefficient of static friction between the sphere and the plane is ? = 0.64. What is the magnitude of the frictional force on the sphere? 

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