[填空题]
A grinding wheel is ww1d0nu pa 86w j:dn.o-v6p;ab (x dcha uniform cylinder with a radius of 8.50 cm and a mass of 0.580 kg. Calculat:cdbhdj.n;6a( ox- vp 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。 $m \cdot N$