[填空题]
A 1.4-kg grindstone in the shape of a uniform h7lbile *i2ht4a,)sy cylinder of radnyb1almf:5ir n-m 1lkde,c5.ius 0.20 m acquires a rotational rate of from rest over a 6.0-s interval at constan1kc mdfliar5,m. 5b-1lnny :et angular acceleration. Calculate the torque delivered by the motor. $m \cdot N$