By James A. Van Allen
Booklet by way of Van Allen, James A.
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Additional resources for 924 elementary problems and answers in solar system astronomy
2 km s-1. The resulting (idealized) trajectory is a parabola with respect to the center of the Earth. As viewed in a heliocentric inertial coordinate system, the trajectory remote from the Earth is (a) a parabola; (b) an ellipse; (c) an hyperbola. 127. As a comet or spacecraft flies by a planet, its planetocentric velocity vector is changed in direction but not in magnitude. Analyze the dynamics of such an encounter and show how a net change in heliocentric kinetic energy of the comet or spacecraft can occur despite the fact that the planet's gravitational field is a conservative one.
Page 27 189. The planet Mercury as observed from the Earth never appears at an angle greater than about 28 degrees from the Sun. What is Mercury's greatest distance from the Sun? 190. In observing the apparent motion of Mars on the star field for a period of two years it is found that its average motion is (a) northward; (b) eastward; (c) sometimes westward; (d) westward. 191. Sketch the relative positions of the Sun, the Earth, and Venus when Venus is at inferior conjunction. 192. Show by a diagram what is meant by the greatest elongation West of Mercury.
A) Jupiter; (b) Saturn; (c) Venus; (d) Mars. 335. What is meant by libration of the Moon? 336. If the Moon had a mass equal to that of the Earth but its present size, the gravitational acceleration at its surface would be about (a) 26; (b) 4; (c) 2; (d) 13 g. 337. 5 billion years. Briefly, what is the principle involved in such a determination? 338. 9 degrees. Hence the Moon's distance is greater than the diameter of the Earth by a factor of about (a) 720; (b) 115; (c) 30; (d) 60. 339. In early 1971 the phases of the Moon were as follows: 19 January Last Quarter 26 January New 2 February First Quarter 10 February Full Suppose that an astronaut landed at the center of the Moon's face on 2 February.
924 elementary problems and answers in solar system astronomy by James A. Van Allen