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## Homework Statement

The moment of inertia of the disk-clay system about the central axis of the disk is I = 1.5 kg m2

Disk's mass = M

The clay's mass = 0.12 kg

Calculate the mass of the disk?

## Homework Equations

I = m r^2

## The Attempt at a Solution

I thought that the moment of inertia may just be the sum of the individual moment of inertia's of the two objects. I know that I for a disk is equal to 1/4 MR^2, but I do not know the one for the clay.[/B]