MHT CET Physics question

Physics Systems of Particles and Rotational Motion MHT CET

A small body is attached to one end of a string is revolved around a rod so that the string winds upon the rod and get shortened. The quantity which is conserved is

(A)angular momentumCorrect
(B)linear momentum
(C)kinetic energy
(D)potential energy

Answer: (A)

Solution

Treating the rod as thin, the tension is central (passes through the axis) so the torque about the axis is zero and angular momentum is conserved; linear momentum

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Question ID VK-040283