Figure 8-34 shows a thin rod, of length L 2.00 m and negligible mass, that can pivot

Chapter 8, Problem 7

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Figure 8-34 shows a thin rod, of length L 2.00 m and negligible mass, that can pivot about one end to rotate in a vertical circle. A ball of mass m 5.00 kg is attached to the other end. The rod is pulled aside to angle u0 30.0 and released with initial velocity. As the ball descends to its lowest point, (a) how much work does the gravitational force do on it and (b) what is the change in the gravitational potential energy of v the ballEarth system? (c) If the gravitational potential energy is taken to be zero at the lowest point, what is its value just as the ball is released? (d) Do the magnitudes of the answers to (a) through (c) increase, decrease, or remain the same if angle u0 is increased? 0v0mFigure 8-34 7, 18,and 21.