[填空题]
A grinding wheel is a uniform cylinder with x6y(mzub3:v,g . zzh ;y6vcnq a radius o dxt08/ e,agb m0*oviwf 8.50 cm and a mass of 0.580 kg. Calcula o/w a0vgtx b8*dme,i0te (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。 $m \cdot N$