In a Laboratory Experiment,a Student Brings Up the Rotational Speed

question 59

Multiple Choice

In a laboratory experiment,a student brings up the rotational speed of a flywheel to 30.0 rpm.She then allows it to slow down on its own,and counts 240 revolutions before the apparatus uniformly comes to a stop.The moment of inertia of the flywheel is 0.0850 kg ∙ m².What is the magnitude of the retarding torque on the flywheel?

• 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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