1. A centrifuge rotor rotating at 9600 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 2.50 m - N Part A If the mass of the rotor is 4.30 kg and it can be approximated as a solid cylinder of radius 0.0470 m through how many revolutions will the rotor turn before coming to rest? Express your answer to three significant figures. Part B How long will it take? Express your answer to three significant figures and include the appropriate units. 2. A 0.75-m-diameter solid sphere can be rotated about an axis through its center by a torque of 11.8 m * N which accelerates it uniformly from rest through a total of 150 revolutions in 15.0 s Part A What is the mass of the sohere? Express your answer to two significant figures