1. The problem statement, all variables and given/known data During normal operation, a computer's hard disk spins at 5400 rpm. If it takes the hard disk 8.4 s to reach this angular velocity starting from rest, what is the average angular acceleration of the hard disk in rad/s2? 2. Relevant equations ? 3. The attempt at a solution I don't even know where to start. Physics is not my strong point, and I definitely do not like angular physics problems.