[填空题]
A centrifuge rotor rotating at 10,300 rpm is shutac32 91z0qh vbm rue3z off and is evmce:p ojs i-0su 1u3)ientually brought uns- poimsuc0iej u1:)3iformly 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