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8.4 A light, rigid rod is 62.8 cm long. Its top end is pivoted on a...

8.4

A light, rigid rod is 62.8 cm long. Its top end is pivoted on a frictionless horizontal axle. The rod hangs straight down at rest with a small, massive ball attached to its bottom end. You strike the ball, suddenly giving it a horizontal velocity so that it swings around in a full circle. What minimum speed at the bottom is required to make the ball go over the top of the circle?
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