Answer: (2/7)tanθ.
- A (2/7)tanθ
- B (2/5)tanθ
- C (1/7)tanθ
- D (1/3)tanθ
Correct answer: A. (2/7)tanθ
Explanation: For a solid sphere the friction needed is f = (2/7)mg sinθ, and the normal force is mg cosθ, so μ<sub>min</sub> = (2/7)tanθ.
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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