A solid disk of mass and radius () rotates at . What is its rotational kinetic energy?
Answer and explanation
Correct answer: C.
- Step 1: Calculate moment of inertia: .
- Step 2: Apply rotational kinetic energy formula: .
- Step 3: Substitute values: .
Answer
100 J.
Why not the others: '' divides by 2 twice; '' forgets the initial factor; '' uses directly.
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