[填空题]
A grinding wheel is a uniform cylinder with a radxy7)jhtpw*cem. * -hwrc8ki) ius of 8.50 cm and a m6pbs8d2 e 3hxodx ++qdass of 0.580 kg. Calculatp2h e+d6b xdqd+o3sx8 e (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。 $m \cdot N$