[填空题]
A grinding wheel is a uniform cylinder with a radi q(r53u+,+arv)oxs voh)wztzus of 8.50 cm and a a.qxvhz94( o ibsrk 45ij3gi(vq, ;ormass of 0.580 kg. C3.r ; zbqo4g4h( irjio(vqa95,s xikvalculate (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。 $m \cdot N$