[填空题]
A 1.4-kg grindstone in 4dy b5;uehsb6 the shape of a uniform cylinder of radius 0.20 y(* ;i*pjiu5 hvp iy7sm acquires a rotational rate of from rest ivis7 i5yup y*(*;j phover a 6.0-s interval at constant angular acceleration. Calculate the torque delivered by the motor. $m \cdot N$