13. Rotational Inertia & Energy
Torque with Kinematic Equations
Multiple Choice
Multiple ChoiceA 1,000 kg disc that has a 5 m outer radius is mounted on a vertical, inner axle 80 kg in mass and 1 m in radius. A motor acts on the axle to speed up or slow down the system. Suppose the motor stops functioning when the system is spinning at 70 rad/s. To bring it to a complete stop, you apply a constant 200 N friction to the surface of the axle. How many revolutions will the system take to stop?
A
5.8
B
2.6×104
C
1.6×105
D
2.5×105
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