Homework Help: Angular velocity and accelerating problem

1. Dec 18, 2008

reaperkid

1. The problem statement, all variables and given/known data

A disk accelerates with a constant angular acceleration of 2.0 rad/s2. If the initial angular velocity is 5.0 rad/s, what is the angular velocity of the disk after rotating though an angle of 11.0 radians?

2. Relevant equations

a = v^2/r
v = change in theta/change in time

3. The attempt at a solution

I'm very confused on these angular problems. Everyone always tells me that they're just like the linear ones but I disagree. There's something big that I'm missing.

I tried a couple things since I couldn't find a good formula to use.

I tried.. 5 + 1/2(2)(11^2) which is wayy too high I'm thinking.

Then I tried 5 + 2*11 = 27 rad/s.. which is also wrong.

Clearly I'm very confused, can anyone help me on the right track?

Thanks!

2. Dec 18, 2008

LowlyPion

3. Dec 18, 2008

reaperkid

Thank you very much! I got it now, I guess I should have searched harder for a good equation.

My fault.