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You have a horizontal grindstone (a disk) that is 86 kg, has a 0.38 m radius,...

You have a horizontal grindstone (a disk) that is 86 kg, has a 0.38 m radius, is turning at 88 rpm (in the positive direction), and you press a steel axe against the edge with a force of 18 N in the radial direction.

Assuming that the kinetic coefficient of friction between steel and stone is 0.20, calculate the angular acceleration of the grindstone in rad/s2.

What is the number of turns, N, that the stone will make before coming to rest?

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