# Wat are the units of angular velocity of precession?

1. Nov 19, 2007

### karnten07

1. The problem statement, all variables and given/known data
What are the units of angular velocity of precession? Ive looked evrywhere and can't find out.

2. Relevant equations

3. The attempt at a solution

In my answer to a question, by putting units into the equation i think im getting units as rad^-1 s^-1 but not sure if it should be rads per second.

2. Nov 20, 2007

### Bill Foster

$$\boldsymbol\omega_p = \frac{Q}{I_s\boldsymbol\omega_s}$$

In which $$I_s$$ is the moment of inertia, $$\boldsymbol\omega_s$$ is the angular velocity of spin about the spin axis, and $$Q$$ is the torque.

Moment of intertia is mass times distance squared.
Angular velocity is radians per second.
Torque is newton-meters, or kilogram meters squared per second squared.

3. Nov 20, 2007

### Bill Foster

I get the same as you:

$$\frac{1}{rad\times s}$$