14. Torque & Rotational Dynamics
Torque on Discs & Pulleys
Multiple Choice
Multiple ChoiceThe composite disc below is free to rotate about a fixed axis, perpendicular to it and through its center. All forces are 100 N, and all angles are 37°. The dotted lines are either exactly parallel or exactly perpendicular to each other. The inner (darker) and outer (lighter) discs have radii 3 m and 5 m, respectively. Calculate the Net Torque produced on the composite disc, about an axis perpendicular to it and through its center. Use +/– to indicate direction.
A
−100 N•m
B
+100 N•m
C
−800 N•m
D
+800 N•m
E
−900 N•m
F
+900 N•m
G
−1440 N•m
H
+1440 N•m
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