Moment of Inertia of a Solid Disk
Easymass moment of inertiadisk
A solid disk has mass 20 kg and radius 0.30 m. Its mass moment of inertia about its central axis is:
- A0.45 kg·m²
- B1.80 kg·m²
- C0.90 kg·m²
- D3.60 kg·m²
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Answer: C. 0.90 kg·m²
I = ½mr² = ½(20)(0.30²) = 0.90 kg·m². Using mr² gives 1.80, the hoop formula.
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