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 = 5.2 s if the magnitude of its angular momentum about the origin is (a)9.0 kg$\cdot$m$^2$/s, (b)9.0t$^2$ kg$\cdot$m$^2$/s$^3$, (c)9.0t$^{1/2}$ kg$\cdot$m$^2$/s$^{3/2}$, and (d)9.0/t$^2$ kg$\cdot$m$^2$$\cdot$s?
(a) Number 0 i 0 j 0 k Units
(b) Number i ! i ! j i ! k Units
(c) Number i ! i ! j i ! k Units
(d) Number i ! i ! j i ! k Units