[填空题]
A centrifuge rotor rota b.eaj8- 4fvjsting at 10,300 rpm is shut off and is eventually omr nsqarhk g2/v9,): brought uniformly )kv:,o/h9 s2raqmr n gto rest by a frictional 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