[填空题]
A centrifuge rotor rotating at 10,3hh3j4 lmg-c , r2ajuy5ldu k.x4/ *85vdwpp hn00 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 1.2 *l5kw hd8pud/vxn4.p $m \cdot N$ 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