[填空题]
A centrifuge rotor rotating at 10,300 rpm xlq guh-*f:jlxs puj 79o+*u) is shut offhh/06td q)fst ljivs 4.:i.af and is eventually brought uniformly to rest by a frictional torque l i0 tq6v t/jihh.)sfas:df .4of 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