A grinding wheel in the form of a uniform solid disk of radius 6.8 cm and mass 2.3 kg. It starts from rest and accelerates uniformly under the action of the constant torque of 0.688 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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A grinding wheel in the form of a uniform solid disk of radius 6.8 cm and mass 2.3 kg. It starts from rest and accelerates uniformly under the action of the constant torque of 0.688 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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