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A particle is to move in an xy plane, clockwise around the origin as seen from...

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 at time t = 7.6 s if the magnitude of its angular momentum about the origin is (a)8.4 kg·m2/s, (b)8.4t2 kg·m2/s3, (c)8.4t1/2 kg·m2/s3/2, and (d)8.4/t2 kg·m2*s?

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