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**1. Homework Statement**

A computer disk drive is turned on starting from rest and has constant angular acceleration.

If it took 0.680s for the drive to make its

*second*complete revolution, how long did it take to make the first complete revolution? (t=?)

**2. Homework Equations**

Θ=(ct^2)/2 (i think)

**3. The Attempt at a Solution**

So, since the angular acceleration is constant, I'm assuming α=c (c being a constant).

So then the intergral with respect to time, would be ω=ct, and then Θ=(ct^2)/2

I tried solving for c using 4π(2 revolutions)=(c(.68^2))/2, and got 54.4 for c, and used that to solve for time of one revolution, but this is wrong. I guess what the problem is saying is that it took 0.680 seconds to go from 2π to 4π, so im stuck