A constant torque of 18.1 N · m is applied to a grindstone whose moment of inertia is 0.131 kg · m2 . Using energy principles, and neglecting friction, find the angular speed after the grindstone has made 15.2 rev. Answer in units of rad/

162.45 rad/s

Explanation:

We are given that

Torque,

Moment of inertia,

Initial angular velocity,

Angular displacement,rad

1 rev= rad

According to Work energy theorem

Work done=Change in kinetic energy

Substitute the values

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0.11 m/s and 0.28 m/s should be correct