[填空题]
A centrifuge rotor r.oe:,v.;gz /szaebf u+.jzg zu(sgf6 otating at 10,300 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of.(+z gf6gsju z 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