[填空题]
A grinding wheel is a unifor: gn qc(uf9dg0y b,oujep:9jqpwv51, m cylindedggx ir66*g ninz: 2+jr with a radius of 8.50 cm and a mass of 0.582xgnigr:*ndzg +j66 i0 kg. Calculate (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。 $m \cdot N$