[填空题]
The comet Hale-Bopp has a period of 37dc n(q 6p gh;t3s,1bld 0zrqi000he6ox,f h(,jwh, pp0r 9d pat. years. (a) What is its mean distance fr.w,h9t h 0d,,r 6ppfjpexh(oaom the Sun?
(b) At its closest approach, the comet is about 1 A.U. from the Sun ( from Earth to the Sun). What is the farthest distance?
(c) What is the ratio of the speed at the closest point to the speed at the farthest point? [Hint: Use Kepler’s second law and estimate areas by a triangle (as in Fig. 5–29, but smaller distance travelled; see also Hint for Problem 59).]
