A small rock with mass 0.16 kg is released from rest at point , which is at the

Question

A small rock with mass 0.16 kg is released from rest at point , which is at the top edge of a large, hemispherical bowl with radius R = 0.42 m (the figure ). Assume that the size of the rock is small compared to R , so that the rock can be treated as a particle, and assume that the rock slides rather than rolls. The work done by friction on the rock when it moves from point A to point B at the bottom of the bowl has magnitude 0.22 J .

A- Between points A and B, how much work is done on the rock by the normal force?

B- Between points A and B, how much work is done on the rock by gravity?

C- What is the speed of the rock as it reaches point B?

D- Just as the rock reaches point B, what is the normal force on it due to the bottom of the bowl?


http://session.masteringphysics.com/problemAsset/1038865/7/YF-07-25.jpg

Explanation / Answer

A.0 B.m*g*R=0.658 J C. 2.339 m/s D.mg+m*v^2/r=3.652 N

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