[填空题]
A centrifuge rotor rotating at 10,3a,kl.8 pw8z :cmgi4g/pf bz) vz9hz*vpm 5u 3b00 rpm is shut off and is eventually brought uniformly to rest by az3ph 9m5 *uzbv frictional torque of 1.2 $m \cdot N$ If the mass of the rotor is 4.80 kg and it can be approximated as a solid cylinder of radius 0.0710 m, through how many revolutions will the rotor turn before coming to rest, $rev$ how long will it take? s