13. Rotational Inertia & Energy
Torque with Kinematic Equations
Multiple Choice
Multiple ChoiceA light, long rope is wrapped around a solid disc, in such a way that pulling the rope causes the disc to spin about a fixed axis perpendicular to itself and through its center. The disc has mass 40 kg, radius 2 m, and is initially at rest, and the rope unwinds without slipping. You pull on the rope with a constant 200 N. Use the rotational version of Newton's Second Law to calculate how fast (in rad/s) the disc be spinning after you pull 50 m of rope.
A
3.2 rad/s
B
15.8 rad/s
C
22.4 rad/s
D
633 rad/s
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