# Homework Help: Finding the moment of intertia

1. Feb 16, 2010

### jumbogala

1. The problem statement, all variables and given/known data
A solid sphere of mass 2 kg and 5 m radius is in space. Find its moment of inertia.

2. Relevant equations2
moment of inertia of a solid sphere about its diameter: $$\frac{2}{5}$$MR2, where M is the mass of the sphere and R is its radius.

3. The attempt at a solution
I = mr^2 = (2 kg)(25 m^2) = 50 kgm^2

Is that right, or am I totally out to lunch? Seems too easy.

Last edited: Feb 17, 2010
2. Feb 16, 2010

### rock.freak667

Yes that looks correct to me.