Answer: length.
- A mass
- B area
- C time
- D length
Correct answer: D. length
Explanation: Since I = Mk<sup>2</sup>, the radius of gyration k = √(I/M) has the dimension of length and is measured in metres.
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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