What is mean by moment of inertia?

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The moment of inertia is a tensor relating the angular velocity to the energy in angular motion and the angular momentum of a rigid body, and the angular acceleration to the torque.



Roughly speaking, it is to angular motion what mass is to linear motion. The formula can be found at http://en.wikipedia.org/wiki/Moment_of_inertia .
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What is moment of inertia?

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