[填空题]
A 1.4-kg grindstone in the shape of a uniform cylixm8c zfun /w3: o1c,nxnder of radius 0j c-k zx6).qlw.20 m acquires a rotational rate of from rest over a 6.0-s interval at constant angular acceleration. Calculatkz)6.wc x-qlje the torque delivered by the motor. $m \cdot N$