Rotational Dynamics About a Fixed Axis: in an Experiment, a Student

question 17

Multiple Choice

Rotational dynamics about a fixed axis: In an experiment, a student brings up the rotational speed of a piece of laboratory apparatus to 30.0 rpm. She then allows the apparatus to slow down uniformly on its own, and counts 240 revolutions before the apparatus comes to a stop. The moment of inertia of the apparatus is known to be 0.0850 kg ∙ m². What is the magnitude of the retarding torque on the apparatus?

• A) 0.0425 N ∙ m
• B) 0.159 N ∙ m
• C) 0.0787 N ∙ m
• D) 0.000278 N ∙ m
• E) 0.0000136 N ∙ m

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