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# Es12

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### Es12

1. 1. Planets and Orbits
2. 2. Objective: to be able to calculate eccentricity of orbits
3. 3. Order of planets My Very Excellent Mother Just Served Us Noodles Mercury, Venus, Earth, Mars,(Asteroids) Jupiter, Saturn, Uranus, Neptune
4. 4. Gravity Planets orbit around the sun due to gravity Gravity weakens with increased distance (think magnetism)
5. 5. Ellipse The shape of orbits.
6. 6. Terms to know FOCI MAJOR AXIS MINOR AXIS
7. 7. Eccentricity Eccentricity: shape of an ellipse. 0 = circle 1 = straight line (bigger the #, more squashed the ellipse)
8. 8. Eccentricity = distance b/t foci/length of major axis E = D/L
9. 9. E=D/L 
10. 10. E= D/L Distance between foci = 152 – 147 = 5 (million) km Length of major axis = 147 + 152 (million) km = 299 million km E = D/L = 5/299 = .017
11. 11. Problem #1
12. 12. Problem 2 
13. 13.
14. 14.
15. 15.