[填空题]
A centrifuge rotor rotating jvo;i7eu a1 w27ce6h rk1eru (at 10,300 rpm is shut off and is evenra( 3eggj5wdzskls3 i7cl:nmw2 g7 ;1 tually brought uniformly to r 1lz:wdi2ls smgna(gkg573e cj;wr37est 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