[填空题]
A centrifuge rotor ro/b z)o)4y) k )d9dnpe 7sqvwjstating at 10,300 rpm gi0n3t:+3gri r.h zt jis shut off and is eventually brought unjhn3. 3rg tizi:t rg0+iformly to 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