[填空题]
A centrifuge rotor rotating aknf fgz r.3n.0ap+(x vt 5m*e.9fv rppo 10,300 rpm is shut off and is eventually brought uniformly to rest by a frictionalp*mov9e5 pfr. 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