[填空题]
The comet Hale-Bopp has a perio+-,rrn3 bcx v8+a) dpzot l:aid of 3000 years. (a) What is its mean- x;9z ;1,.ajkux(mtlco* 9ebfiib on distance from th;t; (* ei, faibzk u-mxobjxo.l99c n1e 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).]
