A mass M hangs on a massless rod of length l which rotates at a constant angular frequency. The mass M moves at a steady speed in a circular path of constant radius. Assume that the system is in steady circular motion with constant angular velocity ω. The angular momentum of M about point A is LA which lies in the positive z direction and the angular momentum of M about B is LB. The correct statement for this system is:

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LA is constant, both in magnitude and direction

LA and LB are both constant in magnitude and direction

LB is constant in direction with varying magnitude

LB is constant, both in magnitude and direction

answer is A.

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Detailed Solution

Angular momentum about A is constant in direction and in magnitude as well. Whereas angular momentum about B is constant in magnitude and varies in direction.LA is constant, both in magnitude and direction.

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