1. The problem statement, all variables and given/known data Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 1.2m diameter and a mass of 250kg. A motor spins up the flywheel with a constant torque of 40Nm. How long does it take the flywheel to reach top angular speed of 1250rpm? 2. Relevant equations Wf = Wi + alpha(delta t) 3. The attempt at a solution I tried using the above equation except I substituted delta W/delta t for alpha. I got 2815.315s, but that seems awfully high, and it wasn't right.