(Solved): The motor in an electric saw brings the circular blade from rest up to the rated angular velocity o ...

The motor in an electric saw brings the circular blade from rest up to the rated angular velocity of $85.0\mathrm{rev}/\mathrm{s}$ in $250\mathrm{rev}$. The mass of the circular blade is $300\mathrm{g}$, and the radius is $10\mathrm{cm}$ (about 4 inches). If the circular blade can be considered as a disk, determine what net torque must the motor apply to the blade to bring it to the above angular speed. Your answer will be in N-m and correct to two decimal places.