# Chp1-2 - lies about 150,000,000 km away. If both have the...

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Next: About this document . .. SCCC 115 Homework 1 - Due 11 Sept. 2003 Prof. Christina Lacey Question 1: Q: How many miles and m are in a light year? A: Distance traveled is: , where v= velocity and t is the time traveled. For light, =speed of light= and 1 year. P 1-2 a) Write the following in scientific notation: (1) b) Write the following in ``normal'' notation:

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c: Calculate: (2) P 1-6 Through how many degrees, arcminutes, or arcseconds does the moon move in: a) 1 hour of time The moon takes 29.5 days to revolve around the Earth once: (3) b) 1 minute of time c) 1 second of time (4) The moon moves its own diameter in an hour.
P 1-9 At what distance is an object if its parallax, as measured from either end of a 1000 km baseline is: a) parallax=1 b) parallax=1 (5) c) parallax=1 (6) P 1-11 Calculate the parallax, using Earth's diameter as a baseline, of the Sun's nearest neighbor, Proxima Centauri, which lies 4.3 l.y. from Earth.

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(7) P 1-13 The moon lies roughly 384,000 km from Earth and the Sun

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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 2-9 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 2-15 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 2005-09-21...
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## This note was uploaded on 11/01/2009 for the course PHYS 229 taught by Professor Mehmetyali during the Fall '09 term at Sabancı University.

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Chp1-2 - lies about 150,000,000 km away. If both have the...

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