[填空题]
A grinding wheel is a uniform cylinder;hr ss0t/n6x oyu2 x(z 5uz7lu with a radius of 8.50 ibxam3a/lh lz)7d/f8m7wr+ f cm and a mass of 0.580 kg. Ca 8lx zfw//fiahldarm+ 7mb) 73lculate (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。 $m \cdot N$