Question

part a
what is required to change the angular momentum of a system?
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force
torque
external force
external torque
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Explanation:

According to the law of conservation of angular - momentum, an external torque is required to change the angular momentum of a system. Internal torques cancel each other out within the system and do not change the total angular momentum. Force and external force alone do not directly change angular momentum; it is the external torque (which is the cross - product of the position vector and the external force) that matters for changing angular momentum.

Answer:

D. External torque