Answer: 8 kg·m².
- A 8 kg·m²
- B 4 kg·m²
- C 15 kg·m²
- D 2 kg·m²
Correct answer: A. 8 kg·m²
Explanation: For bodies on the same axis, moments of inertia simply add: I<sub>total</sub> = I<sub>1</sub> + I<sub>2</sub> = 3 + 5 = 8 kg·m².
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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