[填空题]
A grinding wheel is a md,-zvw 6(kjb1*n 3b xobn4gr uniform cylinder with axxlye 1 npg;)6 radius of 8.50 cm and a mass of 0.580 kg. Cng6xy )le1 px;alculate (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。 $m \cdot N$