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Physics · SYSTEMS OF PARTICLES AND ROTATIONAL MOTION
हिन्दीConsider the following statements regarding the angular momentum and torque of a system of particles: (A) The time rate of change of the total angular momentum of a system of particles equals the sum of external torques acting on the system. (B) The contribution of internal forces to the total torque vanishes only if the forces between particles are equal, opposite, and directed along the line joining the particles. (C) If the net external force on a rigid body is zero, the net torque is independent of the point about which moments are calculated. (D) A body in mechanical equilibrium requires only rotational equilibrium, irrespective of translational forces. Which of the above statements are correct?
Correct answer · Option 3
(A), (B) and (C) only
Explanation
Statements (A), (B), and (C) are strictly correct as per rotational dynamics principles. Statement (D) is incorrect because complete mechanical equilibrium requires both translational and rotational equilibrium.
