[填空题]
A grinding wheel is a2p0x .6*bypdtub0)iyx*yvusn *0xy q ww 9c0r uniform9ozq4 di k8tjad1jt i+w- -n+a cylinder with a radius of 8.50 cm and a mass of 0.580 kg. Calculate1wjd ai j- itt+k-q4a8z9on +d (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。 $m \cdot N$
