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A grinding wheel in the form of a uniform solid disk of radius 8 cm and...

A grinding wheel in the form of a uniform solid disk of radius 8 cm and mass 1.8 kg. It starts from rest and accelerates uniformly under the action of the constant torque of 0.866 N*m.  

(a) How long does it take the wheel to reach its operating speed of 1200 rev/min?

  

(b) How many full rotations does it make before coming to its operating speed?

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