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Figure P13.21
22. Two planets X and Y travel counterclockwise in circular orbits about a star as
shown in Figure P13.22. The radii of their orbits are in the ratio 3:1. At one
moment, they are aligned as shown in Figure P13.22a, making a straight line with
the star. During the next five years, the angular displacement of planet X is 90.0°
as shown in Figure P13.22b. What is the angular displacement of planet Y at this
Figure P13.22
23. Comet Halley (Fig. P13.23) approaches the Sun to within 0.570 AU, and its
orbital period is 75.6 yr. (AU is the symbol for astronomical unit, where 1 AU =
1.50 × 1011 m is the mean Earth–Sun distance.) How far from the Sun will
Halley’s comet travel before it starts its return journey?