[填空题]
A grinding wheel is a uniform cylinp1l,z8qjag, 6q i5 qwpder with a4 rd .l/g:neli radius of 8.50 cm and a mass of 0.580 kg. Calculatdl:i4 lnr/ge .e
(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。 $m \cdot N$
