Aenergy storage system based on a flywheel (a rotating disk) can store a maximum of 4.0 mj when the flywheel is rotating at 20,000 revolutions per minute. what is the moment of inertia of the flywheel?

Moment of inertia of the flywheel,          

Explanation:

Given that,

The maximum energy stored on  flywheel,

Angular velocity of the flywheel,

We need to find the moment of inertia of the flywheel. The energy of a flywheel in rotational kinematics is given by :

I is the moment of inertia of the flywheel

On rearranging we get :

So, the moment of inertia of the flywheel is . Hence, this is the required solution.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach