You have a grindstone (a disk) that is 90.0 kg, has a 0.340-m radius,

and is turning at 90.0 rpm, and you press a steel axe against it with a

radial force of 20.0 N. (a) Assuming the kinetic coefficient of friction

between steel and stone is 0.20, calculate the angular acceleration of

the grindstone. (b) How many turns will the stone make before coming

to rest?

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