[填空题]
A centrifuge rotor rotating at: 5lbz2 kj7 ggqfvn.5t 10,300 rpm i iyr(8p(wwa6ff+tac+) *lblbs shut off and is eventually brought unifor 6b(+cayl8*f(pb+w)tlr i f awmly 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