21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 9, Problem 43QP
To determine

Compare the average speed of carbon dioxide molecule on Earth and Mars.

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Use the heuristic that a planet will have lost a given molecule from its atmosphere of 4.5 Billion years if the average molecular speed exceeds % of the planet's escape speed to calculate what mercury's mass would have to be in order to it to still have a nitrogen atmosphere like earth's? The molecular weight of nitrogen is 28 atomic units.
Evidence exists that Mars may have had oceans 0.500 km deep in its early history. We don't know what the atmospheric pressure on Mars was back then, but some studies suggest it may have been as high as 50,000 Pa. What would have been the highest pressure at the bottom of these oceans? Density of water is 1000 kg/m³, gmars = 3.71 m/s².
Do you think the Moon could retain an atmosphere of nitrogen for the age of the Solar System? Explain why or why not
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