[填空题]
A grinding wheel is a uniform3veo rqb/il.5f-o q3w cz3ax 1gkb q6 a g/. aj61xaj)u(jy+kfwylinder with a radius of 8.50 cm and a mass of 0.580 kg. Calculk3z a.1)(/uaf+ a6yjg6 xajkwjxqbg1 ate (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。 $m \cdot N$