[填空题]
The comet Hale-Bopp has a period jz8llu)i+5wi7j hs/sof 3000 years. (a) What is its mean dige 4r nh6kef 38lcx4j;stance from the Sun? 64exckr n4flje;h3 8 g (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).]
