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April 20, 2014

Homework Help: Physics

Posted by Frankie on Tuesday, October 23, 2012 at 3:24pm.

a small rock with mass 0.20 kg is released from rest at point A which is at the top edge of a large, hemispherical bowl with radius R = .5m. 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 a magnitude 0.22 J.

A. Between points A and B, how much work is done on the rock by (i) the normal force and (ii) gravity?

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

C. Of the three forces acting on the rock as it slides down the bowl, which (if any) are constant and which are not? Explain.

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

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