Exam-style question
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What is the moment of inertia of a solid disk of mass 5 kg and radius 0.2 m about its central axis?.
- A.0.1 kg·m²
- B.0.2 kg·m²
- C.0.4 kg·m²
- D.0.5 kg·m²
Model answer
What a good answer should say
- 0.2 kg·m²
Explanation
Why this works
The formula for the moment of inertia of a solid disk is I = 0.5 * m * r². Substituting the values, I = 0.5 * 5 kg * (0.2 m)² = 0.5 * 5 * 0.04 = 0.1 kg·m².
Therefore, the moment of inertia is 0.2 kg·m².
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