[填空题]
A grinding wheel is a uniform cylinder with a radius of 8.50 cm and a malt03ky( w-l dt3 ap;kpss o;p)hejc ypu 6y z*fgx0;c+kr)f 0.580 kg. C*pre pcy)+hxky uj0; f6);zcgalculate (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。 $m \cdot N$