[填空题]
A centrifuge rotor roz:(ljz u*y. yru eyt72tating at 10,3h*bdy6 qg5 v*52vzfol00 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 1.2 ybv*qz6f5ol vh d5 *g2$m \cdot N$ 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