Angular Acceleration of a rotating wheel

1. Oct 27, 2006

TrippingBilly

A rotating wheel requires 2.98 s to rotate through 37.0 revolutions. Its angular speed at the end of the 2.98 s interval is 98.8 rad/s. What is the constant angular acceleration of the wheel?

First I tried acceleration = (98.8rad/s - 0 rad/s) / 2.98 s - 0s = 33.15, which was incorrect.

Then I tried acceleration = (98.8rad/sec)^2 - (0 rad/sec)^2 = 2 * acceleration * 74pi and solving for acceleration i got 20.99 but thats incorrect too. I got 74 pi by converting 37 rev.

Any clue as to what I'm doing wrong?

2. Oct 27, 2006

OlderDan

If all the information given in the problem is correct, the wheel is not starting from rest.

3. Oct 27, 2006

TrippingBilly

Huh, I guess I never considered that. That's frustrating :\ Thanks for your help though :)

4. Nov 2, 2006

TrippingBilly

never mind, i got it :)

Last edited: Nov 2, 2006
5. Nov 2, 2006

OlderDan

I thought you had it when you posted your previous reply. Sorry if you were expecting something more.

6. Nov 2, 2006

TrippingBilly

Oh no, I stopped looking at the problem for a while. But I decided to come back to it, and I had posted another question, but in the meantime I figured out the answer so I edited my post to the one you quoted. No worries :)