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A grindstone with I = 4,000 kg - m is rotating at an initial speed = 2.2 Friction and then brings it to rest after

A grindstone with I = 4,000 kg - m² is rotating at an initial speed = 2.2 Friction and then brings it to rest after 9.4 revolutions. What is the magnitude of the torque exerted on the grindstone by friction? Solve this problem using work-energy methods, not angular kinematics.

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