In a Lab Experiment, a Student Brings Up the Rotational

Multiple Choice

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

A) 0.0425 Nm
B) 0.159 Nm
C) 0.0787Nm
D) 0.000278 Nm
E) 0.0000136 Nm