Physics Question, Moments of Inertia?

Bob

New member
A rotating flywheel is used as a device to store energy. It is required that such a device be able to store up to a maximum of 1 x 10^6 J when it is rotating at 500 rad/s, what is the value of the moment of inertia required?

The answer is 8 kgm^2, but i have no clue where to even start to solve this question.
 
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