[填空题]
A centrifuge rotor rotating at 10,300 rpi/2 n:uz w.knwb5gm1n m is shut off and is eventually brougdwv.li l1 h5qjiy;fx5;d 2rd(ht uniformly to rest byqd;( ii1lr x2dld 5y ;.hfv5jw 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