[填空题]
A science-fiction tale di4l82)o h,z5ml x8nup/ifbj: z 8ozep escribezgc z5rbvgciq2t ori r818;d 877pot6s an artificial "planet" in the form of a band completely encircling a sun (Fig. 5-40). The inhabitants live on the inside surface (where it is always noon). Imagine that this sun is exactly like our own, that the distance to the band is the same as the Earth-Sun distance (to make the climate temperate), and that the ring rotates quickly enough to produce an apparent gravity of g as on Earth. What will be the period of revolution, this planet' rqd;287c rzbvzr 68ti pog7cgt851i os year, in Earth days?
