Answer: 2:1.
- A 2:1
- B 1:1
- C 1:2
- D 3:1
Correct answer: A. 2:1
Explanation: For disk: I = mR²/2. KE_trans = (1/2)mv², KE_rot = (1/2)(mR²/2)(v/R)² = mv²/4. Ratio = 2:1.
Torque about axis O equals the force F multiplied by the perpendicular distance r⊥ from the axis to the line of action of the force, producing rotation.
Concept context
Moment of inertia, torque, angular momentum, rolling motion. Very high JEE weightage.
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