Question: A particle is to move in an xy plane, clockwise around the origin as seen from the positive side of the z axis. In unit

A particle is to move in an xy plane, clockwise around the origin as seen from the positive side of the z axis. In unit vector notation, what torque acts on the particle if the magnitude of its angular momentum about the origin is?
(a) 4.0kg ∙ m2/s,
(b) 4.0t2 kg ∙ m2/s,
(c) 4.0 √ t kg ∙ m2/s, and
(d) 4.0/t¬2 kg ∙ m2/s?

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