[填空题]
A 23.4-kg solid alumin3pjifurr 1pzhn; g*e) ;u- jg/exi8 n9 14-kmxteh6z ot1nx(ium cylindrical wheel of radius 0.41 m is rotating about its axle on frictionless bearings with -t xt i8km9nx41ei(6oz1hx e nangular velocity $\omega$ = 32.8 rad/s If its temperature is now raised from 20.0 $^{\circ} $ C to 75.0 $^{\circ} $ C, what is the fractional change in $\omega$?