Question

A conical pendulum as shown in figure is rotating at angular velocity '$\omega$' about suspension point P, then for pendulum

• A. angular momentum about P is conserved.
• B. torque due to tension about P is zero.
• C. angular momentum about axis of rotation is conserved.
• D. net torque about P is zero.

Answer 1

Answer: (B), (C)

angular momentum about axis of rotation is conserved.


About point P, ${\tau }_{net}=mgR$
Since ${\tau }_{net}\ne 0$, L is not conserved.

Net torque about the axis of rotation due to gravity and the tension is zero. Therefore, the angular momentum is conserved.