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
D
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