[填空题]
Calculate the momentrx+t bbc 5z3 -c0 t8cs(cnu0pl; z(e- ttlqgi/t ,1)ps,jbjzgdgm;c0 of inertia of a bicycle wheel 66.7 cm in diameter. The rim and tire have a co,1p/(jtz;; ,g ) e-tc0i tgldjzsgbmqmbined mass of 1.25 kg. The mass of the hub can be ignored (why?). $kg \cdot m^2$