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### HW1

Course: ASTR 3720, Fall 2008
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Word Count: 282

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3720 ASTR/ATOC Homework Assignment #1 Due: Tues. Jan. 28 in class Show your work, as partial credit will be given for your thought processes, even if you don't get to the correct answer at the end! Work the problems on a separate sheet of paper please. Be neat and organized! We can't give credit for answers we can't read! 1. The &quot;Solar Constant&quot; measured in space at the orbit of Earth is 1368...

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3720 ASTR/ATOC Homework Assignment #1 Due: Tues. Jan. 28 in class Show your work, as partial credit will be given for your thought processes, even if you don't get to the correct answer at the end! Work the problems on a separate sheet of paper please. Be neat and organized! We can't give credit for answers we can't read! 1. The "Solar Constant" measured in space at the orbit of Earth is 1368 Watts/m2. If the Sun were a lightbulb, calculate what "Wattage" light bulb it would be? (Hints: the Sun is emitting energy in all directions; and 1 AU = 1.5x1011 m). 2. Given that Saturn's distance from the Sun is 9.52 AU and it absorbs 37% of the sunlight that falls on it, what is the effective (or equilibrium) temperature of the planet? 3. The mean distance of Mars from the Sun is 1.524 AU, but the planet is actually in an elliptical with orbit an eccentricity of 0.093. Given that the albedo of Mars is 0.16, what is the effective (equilibrium) temperature at both the perihelion (closest) and aphelion (farthest) points on Mars' orbit? 4. Calculate the scale heights of the atmosphere near the surfaces of Mars and Venus. Assume that the atmospheres of Mars and Venus are essentially all CO2 and the temperature at Mars is 223 K and Venus is 750 K. Note, a periodic table, and the tables at the back of NSS (the New Solar System) will ...

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