[填空题]
A centrifuge rotor rotating 0po8e eocdi fisn/6+,at 10,300 rpm is shut off and is evenp6dvkw u23 5g -kwugl)tually brought uniforml)k-wuku 26vwg l53 pdgy 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