[填空题]
A grinding wheel is a unis)h;bm;4gsal4a ,odwl i6c 7v form cylinder with ajvgb3/b nus:p9 ngff3ch 0(v ) radius of 8.50 cm and a mass of 0.580 kg. Calculatfv fb/9gh:3vcn)0 gnb(3 sujpe (a) its moment of inertia about its center, $\approx$ $kg \cdot m^2$ (b) the applied torque needed to accelerate it from rest to 1500 rpm in 5.00 s if it is known to slow down from 1500 rpm to rest in 55.0 s。 $m \cdot N$