[填空题]
A grinding wheel is a uniformw*pog (tt o,1 r*8pvr+0clwjb cylg85t yv qlbre ;)d:,hcinder with a radius of 8.50 cm and a mass of 0.580 kg. C:c g;qhyb,le )vt5dr8alculate (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。 $m \cdot N$