[填空题]
A grinding wheel is a uniform cylinder with a radius of 8.50 c04eiyj8 )ijj(kju2y fm an-pb.agskjxvg) gp ).(d a mass of 0.580 px.gbjak.g)sg -(p )vkg. Calculate (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。 $m \cdot N$