A centrifuge rotor rotating at 9500 rpmrpm is shut off and is eventually brought uniformly to rest by a frictional torque of 2.28 m⋅Nm⋅N . If the mass of the rotor is 4.19 kgkg and it can be approximated as a solid cylinder of radius 0.0490 mm , through how many revolutions will the rotor turn before coming to rest? How long will it take?

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