# Moment of Inertia help

1. Nov 4, 2006

### dtesselstrom

Determine the moment of inertia about the axis of the object shown in the figure. Enter your answer in terms of L, M, m1, and m2.

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Last edited: Nov 4, 2006
2. Nov 4, 2006

### Galileo

What have you tried so far?

By the way, this belongs in the homework section.

3. Nov 4, 2006

### dtesselstrom

ok sorry for posting in wrong section.
Ive tried 1/12(m1+m2+M)*L^2 and 1/12(m1+m2+M)*L^2+1/4*m1*L^2-1/16*m2*L^2

Last edited: Nov 4, 2006
4. Nov 4, 2006

### Galileo

The moment of inertia of an object about an axis is just the sum of the moments of inertia of its constituents about that axis; i.e. in this case:
$$I=I_{rod}+I_{m1}+I_{m_2}$$

What do you get for these seperate moments of inertia?