[填空题]
A centrifuge rotor rotating atsb dj1 n:ypy5j0u j*y,3rn 2du 10,300 rpm is shut off and is ea u3tmxx 4,zd xh 7f1f76scj*qventually brought uniformly to rest by a frictiona taxu6s mch134q xz,j7*d7ff xl 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