[填空题]
A grinding wheel is uo b*gyv)botbh4t:fha8-s 2. a ushpckt- 3n8 1lniform cylinder with a radius of 8.50 cm and a mass of 0.580 kg. Calc1ns 8l-hp 3tkculate (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。 $m \cdot N$