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MCQIntermediateGalaxies & Extragalactic Astronomy
USAAAO — 2024 First Round
Question 8
The mass density of the Milky Way galaxy determines the orbital velocity of planets, stars, and other objects orbiting around its center. Assuming a constant surface mass density σ for the Milky Way and modeling it as a perfect circular disk, identify the dependence of the circular orbital velocity v(r) of a point mass at radius r from the galaxy’s center.
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Source
USAAAO 2024 First Round, Question 8. Question text, choices, and answer were transcribed from the official USAAAO exam and solutions PDFs.