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a 6.4 kg disc rotates with initial angular velocity 18700rpm. a worker shuts off the electrical...

a 6.4 kg disc rotates with initial angular velocity 18700rpm. a worker shuts off the electrical switch and the disk comes to rest with constant acceleration produced by frction torque of 1.4 m*N. the radius of the disk is 0.23 m. moment of inercia: mR^2/2. calculate the time of the first 390 full rotations of the disk, after switch shuts off.
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