# Finding the moment of intertia

## Homework Statement

A solid sphere of mass 2 kg and 5 m radius is in space. Find its moment of inertia.

## Homework Equations

2
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.

## 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.

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