[填空题]
A grinding wheel is a uniform cylindergqhg1zx zy *e83v5m/xk*z( esq o2ml/ wit2ci b m4jg8l3m f1s,aoh a radius of 8.50 cm and a mass of 0.580 kg. Ccmjlib2 o8,g 4asmf1 3alculate
(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。 $m \cdot N$
