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3. 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. (a
-0.26 rad/s2)
(b) How many turns will the stone make before coming to rest? (27 rev)

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