[填空题]
A grinding wheel is l7;0 tcjp7rfy io:/br.j; rp5 0oo7qe3or2ve/b h ol*lc*d:ehqqr,oa uniform cylinder with a radius of 8.50 cm and a mass of 0.580 kg. Calce0 q3p5oboorcdoovhqehq.l;2*ej,:r */7 l rulate (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。 $m \cdot N$