Answer: Conservation of angular momentum.
- A Conservation of angular momentum
- B Conservation of linear momentum
- C Conservation of energy
- D Conservation of mass
Correct answer: A. Conservation of angular momentum
Explanation: As the planet gets closer to the Sun, r decreases, so v must increase to keep L = mvr constant (Kepler's second law).
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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