[填空题]
A centrifuge rotor rotating at 10,j+n a3 5wii:tgu1q (nu300:l 5g*r)i9pg izz; ve9puzy )n rpm is shut off and is eventually brought uniformly to rest by a frictional ) e95vzy lp:p;zug 9 ini)*rgztorque 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