While spinning down from 500.0 rpm to rest, a solid uniform flywheel does 5.1 kj of work. if the radius of the disk is 1.2 m, what is its mass?

Mass will be equal to 5.173 kg

Explanation:

Energy due to rotation of uniform flywheel is E = 5.1 KJ = 5100 J

Angular speed

Radius r = 1.2 m

Rotational kinetic energy of flywheel is

So

Moment of inertia of solid flywheel is

So

So mass will be equal to 5.173 kg

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