Suppose David puts a 0.50-kg rock into a sling of length 1.5 m and begins whirling the

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Suppose David puts a 0.50-kg rock into a sling of length 1.5 m and begins whirling the rock in a nearly horizontal circle above his head, accelerating it from rest to a rate of 120 rpm after 5.0s, What is the torque required to achieve this feat, and where does the torque come from?
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