[填空题]
A 1.4-kg grindstone in the shape ,r7c, 5pynkoa of a unilrbtoms1c +2fc7 lc/ 4form cylinder of radius 0.20 m acquires a rotational rate of from rest over amb 1crs7+tcl lc2/4of 6.0-s interval at constant angular acceleration. Calculate the torque delivered by the motor. $m \cdot N$