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 = 0.67 s if
the magnitude of its angular momentum about the origin is (a)3.1
kg·m2/s, (b)3.1t2 kg·m2/s3, (c)3.1t1/2 kg·m2/s3/2, and (d)3.1/t2
kg·m2*s?