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## Homework Statement

What is the rotational inertia of a solid iron disk of mass 46 kg, with a thickness of 6.31 cm and radius of 19.4 cm, about an axis through its center and perpendicular to it?

## Homework Equations

either 1/2MR^(2) or I = sigma (1->N) Mi x Ri^(2)

## The Attempt at a Solution

I don't know what to do!!!