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Unformatted text preview: FREQUENTLY ASKED QUESTIONS January 18, 2012 Administrative Questions Will there be a formula sheet for this class? For the midterm and final exams, you will make your own formula sheet. Content Questions Why do we need to observe stellar parallax in order to prove that the Earth is orbiting around the Sun? Observation of stellar parallax doesnt necessarily prove Earth iss orbiting around the Sun, but it does suggest the Earth is moving relative to the fixed stars. Tycho did not observe stellar parallax (not because there isnt any but because he could not measure stellar positions accurately enough to see very small motions). He concluded (erroneously) that the Earth was therefore not moving, and so it therefore was not orbiting the Sun. Can you give some physical intuition for Keplers 2nd Law? Heres a semi-qualitative way to think of it, thats slightly mushy but still may be helpful: a planet moves faster when its closer to the Sun, because the force of gravity is stronger and so provides more acceleration; the planet...
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This note was uploaded on 02/26/2012 for the course PHYSICS 105 taught by Professor Kruse,m during the Spring '08 term at Duke.
- Spring '08