chap1_f04_probs.doc

# chap1_f04_probs.doc - Fall 2004 Dr Mike Fanelli Solutions...

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Fall 2004 Dr. Mike Fanelli Solutions to Assigned Problems Chapter 1 PROBLEM 1-1: In one second light leaving Los Angeles reaches about how far ? Five possibilities are listed. ANSWER : Light travels at 300,000 kilometers per second, a large but not infinite speed. Of the five choices, the correct one is (c) the Moon, since the moon’s average distance from Earth is given as 384,000 km. Light (or radio waves) takes about 1.3 seconds to reach the Moon. PROBLEM 1-6: Through how many degrees, arcminutes, and arcseconds does the Moon move in (a) one hour, (b) one minute, (c) one second ? How long does it take the Moon to move a distance equal to its own diameter on the sky ? ANSWER : In this problem you are asked to think about angular motion — the motion of an object across the sky with respect to the background of stars. The Moon takes 27.3 days to complete 1 orbit of the Earth with respect to the stars, a period known as a sidereal month. Through a telescope, the moon’s motion is readily apparent, but to the eye, it requires careful observation over several hours to notice the Moon’s changing position against the background of stars. This problem exercises your understanding of (1) angular units such as degrees, arcminutes, and arcseconds, (2) the conversion between one set of units into another, and, (3) the use of ratios .

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• Fall '14
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