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## Homework Statement

During normal operation, a computer's hard disk spins at 7200 rpm. If it takes the hard disk 3.7 s to reach this angular velocity starting from rest, what is the average angular acceleration of the hard disk in rad/s2?

## Homework Equations

Change in Angular Accerlation/ Change in time

## The Attempt at a Solution

I tried the above equation but the online homework says the answer is wrong. I'm not sure of what else to do.