Rotational Dynamics: A mechanic is examining the wheel of a bicycle to adjust the brake. With the bicycle off the ground, he manually rotates the wheel until it reaches an angular speed of 12.0 rad/s and then allows it to coast to a stop. If the wheel has a moment of inertia of 0.100 kg ? m2, and the wheel slows uniformly to a stop in 160 s, what is the magnitude of the retarding torque?
A. 1.00 N ? m
B. 0.00750 N ? m
C. 0.0787 N ? m
D. 1.33 N ? m
E. 1.67 N ? m
Answer: B
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