[填空题]
A grinding wheel is a uniform cylinder with a radius k0w.wb 4 atn+ 7;ysr nm9ymo8zorbdtw(ag60 irin.dm l06 w 6k7f 8.50 cm and a mass of 0.580 kg. Calculate .6gl(0b0rkw ntia wmd 76idr6 (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。 $m \cdot N$