If the sum of the external torques on a system is zero,there is
A)a change in the system's moment of inertia.
B)no change in the system's moment of inertia.
C)a change in the system's angular momentum.
D)no change in the system's angular momentum.
E)a precessional angular velocity.

Question

Quizplus · Accepted Answer

If the sum of the external torques on a system is zero, then according to the principle of conservation of angular momentum, there will be no change in the system's angular momentum. This means that the system will maintain its original angular momentum, and there will be no change in its rotational motion. Therefore, option D is the correct choice. Option A is incorrect because a zero net external torque implies no change in moment of inertia. Option B is not an optimal choice because even though the answer is true, it does not give a direct answer to the question. Option C is not correct because there is no change in angular momentum in this case. Option E is not a valid choice because the question does not mention anything about a precessional angular velocity.

If the Sum of the External Torques on a System