Homework Help: Find Angular Velocity when given Angular Acceleration?

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1. Nov 5, 2015

Justinclewis94

1. The problem statement, all variables and given/known data
Starting from rest, a spinning compact disk undergoes an angular acceleration of 5.0 rad/s^2. What is the angular speed of the disk after 3 revolutions?

2. Relevant equations
a=Δω/Δt
ω=Δθ/Δt

3. The attempt at a solution
I do not understand how to solve this equation when I am not given a time. I don't have a radius, so I can't find the circumference either. How can I solve this?

Last edited: Nov 5, 2015
2. Nov 5, 2015