[填空题]
A 1.4-kg grindstone in the shape of a uni9az+0ypgn2 cl form cylinder of radiusz/e y86-kgook 0.20 m acquires a rotatioyo/e8z- 6kkognal rate of from rest over a 6.0-s interval at constant angular acceleration. Calculate the torque delivered by the motor. $m \cdot N$