A 3.20 kg rock has a horizontal velocity of magnitude 12.0 m/s when it is at point P in the figure.  a) At this instant, what is the magnitude of its angular momentum relative to point O? What is the direction of the angular momentum?  b) If the only force acting on the rock is its weight, what is the magnitude of the rate of change of its angular momentum at this instant? Express your answer in kilogram-meters^2 per second squared.  c) What is the direction of the rate in part (b)?

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.