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Unformatted text preview: lies about 150,000,000 km away. If both have the same angular size as seen from Earth, how many times larger is the Sun than the moon? Let =diameter and distance: (8) So: (9) (10) We can divide Eq 13 by Eq 14 : Remember that : (11) Thus, the Sun is 395 times larger than the moon in diameter. P 29 Jupiter's moon Callisto orbits Jupiter at a distance of 1.88 million km ( km). Callisto's orbital period about Jupiter is 16.7 days (=P). (Assume Callisto's mass is negligible compared to Jupiter). What is the mass of Jupiter? From Eq. 2.7 in textbook: (12) One can assume that Callisto's orbit is roughly circular, so: (13) (14) P 215 The Moon's mass is kg and the radius of the Moon is km. What is the speed of a spacecraft moving in a circular orbit just above the lunar surface? What is the escape speed? (15) • About this document . .. Next: About this document . .. Christina Lacey 20050921...
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 Fall '09
 MehmetYali
 Work, Light, Astronomical unit, Prof. Christina Lacey, Christina Lacey

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