The problem that follow involve straight-line motion. The time t is in seconds unless othe...

The problem that follow involve straight-line motion. The time t is in seconds unless otherwise stated.

Problem

The rotor of an electric generator is rotating at 200 rpm when the motor is turned off. Due to frictional effects, the angular acceleration of the rotor after the motor is turned off is α = –0.0lω rad/s2, where ω is the angular velocity in rad/s.

(a) What is the rotor’s angular velocity one minute after the motor is turned off?

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(b) After the motor is turned off, how many revolutions does the rotor turn before it comes to rest?

Strategy: To do part (b). use the chain rule to write the angular acceleration as