13. Rotational Inertia & Energy
Moment of Inertia of Systems
Multiple Choice
Multiple ChoiceA composite disc is built from a solid disc and a concentric, thick-walled hoop, as shown below. The inner disc (solid) has mass 4 kg and radius 2 m. The outer disc (thick-walled) has mass 5 kg, inner radius 2 m, and outer radius 3 m. Calculate the moment of inertia of this composite disc about a central axis perpendicular to the discs.
A
40.5 kg•m2
B
53 kg•m2
C
67 kg•m2
D
70.5 kg•m2
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