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## Homework Statement

a) A disk is turned on starting from rest and has constant angular acceleration. If it takes .750s for the drive to make it's second revolution, how long did it take to make its first complete revolution?

b) What is it's angular acceleration?

## Homework Equations

theta = 1/2αt

^{2}+ wt

w = w

_{o}+ αt

## The Attempt at a Solution

I tried solving b) first and set theta = 2(2pi), so I have:

4pi = 1/2αt

^{2}and after solving for α it's saying the answer is wrong..

This isn't making sense to me.. Thanks for any help.