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# Homework D - Astronomy 100 Homework D Fall 2008 Jim...

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Astronomy 100 – Homework D Fall 2008: Jim Kaler (Reason for correct answer is in italics ) 1. Venus appears brightest to us when it is in what phase? a) new b) full c) half d) gibbous e) crescent (Though only partially illuminated, it's close to us when it's in the crescent phase.) 2. For the Solar System, the period of a planet in years squared equals the semi-major axis in AU raised to what power? a) 1 b) 2 c) 3 (Kepler's third law) d) 4 e) 5 3. As a planet approaches perihelion from aphelion, it a) moves slower (in kilometers per second) b) moves at a constant speed c) moves faster (in kilometers per second) (Kepler's second law) d) at first moves faster, then slows down e) at first moves slower then speeds up 4. Which observation by Galileo supports the Copernican theory? a) phases of the Moon b) retrograde motion c) the discovery of Pluto d) the color of Mars e) the phases of Venus (which it has only if the Sun is at the center of the Solar System) 5. If you were to triple the mass of the Earth but keep the radius the same you would weigh a) the same as you do now b) 3 times as much as you do now (force = [const( M1 * M2]/R 2 ) c) 1/3 as much as you do now d) 9 times as much as you do now e) 1/9 times as much as you do now 6. Where does the Earth's gravity actually end? a) at the Sun

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Homework D - Astronomy 100 Homework D Fall 2008 Jim...

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