[填空题]
The comet Hale-Bopp has a period of 3000 years. ( pq*9r9+p;c5lfz3/jqrm z nbba) What is its mean diw7bee*nuxd5 1 /qub z-stance from t/5n*x-eu7q1 bwzbudehe 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).]
