The rotor of an electric motor has an angular velocity of
Chapter 16, Problem 16.25(choose chapter or problem)
The rotor of an electric motor has an angular velocity of 3600 rpm when the load and power are cut off. The 50-kg rotor, which has a centroidal radius of gyration of 180 mm, then coasts to rest. Knowing that kinetic friction results in a couple of magnitude \(3.5\mathrm{\ N}\cdot\mathrm{m}\) exerted on the rotor, determine the number of revolutions that the rotor executes before coming to rest.
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