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## Homework Statement

## The Attempt at a Solution

Alright, so the solution manual shows that the intertia of the disk is:

I = m * k

^{2}, where k is the radius of gyrationHowever why can't the inertia of the disk be:

I = 0.5 * m * r

This is the formula for the inertia of a rotating disk... However when I plug in all my numbers I get a different inertia value when compared to the inertia value that I got using the radius of gyration.^{2}, where r is the radius of the disk