physics
posted by Anonymous .
A solid sphere of mass m and radius r rolls with out slipping along the track.it starts from rest with the lowest point of tthe sphere at aheight h above the bottom of the loop of radius R,much larger than r.(a) what is the minimum value of h (interms of R)such that the sphere completes the loop?(b)what are the force components on the sphere at the point if h=3R?

a) 27/10R
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