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Introductory Physics Homework Help
Example in chapter: Gravitation
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[QUOTE="mfb, post: 5872712, member: 405866"] By definition, the eccentricity tells you how much periapsis and apoapsis deviate from the semi-major axis, here 20%=0.2. Periapsis is at (1-0.2) times the semi-major axis, and apoapsis is at (1+0.2) times the semi-major axis. The semi-major axis is the mean of the two, and you are given the sum, so you have to divide the sum by 2 to get the the semi-major axis. [/QUOTE]
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Introductory Physics Homework Help
Example in chapter: Gravitation
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