A Mechanic Is Examining the Wheel of a Bicycle to Adjust

question 29

Multiple Choice

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