Can you explain how 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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