[填空题]
Calculate the momentx t8tp) rtq,n1 of inertq43gt +w1su mrwbkn z,feu42 :ia of a bicycle wheel 66.7 cm in diameter. The rim and tire have a combined mass of 1.25 kg. The massr 3z:q4ekg u4twn u1ms ,f2bw+ of the hub can be ignored (why?). $kg \cdot m^2$