In Fig. 8-36, the string is L = 120 cm long, has a ball

Chapter 8, Problem 70

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In Fig. 8-36, the string is L = 120 cm long, has a ball attached to one end, and is fixed at its other end. A fixed peg is at point P. Released from rest, the ball swings down until the string catches on the peg; then the ball swings up, around the peg. If the ball is to swing completely around the peg, what value must distance d exceed? (Hint: The ball must still be moving at the top of its swing. Do you see why?)

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