[填空题]
The comet Hale-Bopp has a period of 3000 years. (a) What yp w :jd96tg0j0lw.kais its mean disg4x1 4uc8oaf.wmt6mp tance from the Suat .w6x 8oc1 u44gmmfpn?
(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).]
