How Do You Calculate the Average Rotational Speed of a CD in Radians per Second?

[crybllrd]

Homework Statement

If a CD makes 1500 revolutions in 5 minutes, what is the CD's average rotational speed (in units of rad/s)

Homework Equations

\omega = \frac{\Delta\theta}{\Delta t}

-or-

\omega = \frac{2\pi}{\Delta t}

The Attempt at a Solution

This problem seems a little too simple (and I didn't use the given equation), so I want to make sure I did it right:

(5min)(60s/min)=300 seconds in 5 minutes

\frac{1500rev}{300s}=5rev/s

 

[tvavanasd]

The Attempt at a Solution

This problem seems a little too simple (and I didn't use the given equation), so I want to make sure I did it right:

(5min)(60s/min)=300 seconds in 5 minutes

\frac{1500rev}{300s}=5rev/s

You didn't answer the question; how many radians are there in one revolution?

 

[crybllrd]

...how many radians are there in one revolution?

\frac{300s}{1500rev}=.2s/rev

\frac{2\pi}{.2}=31.4rad