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OpenStudy (anonymous):
he sun orbits of the Milky Way Galaxy at about 220 km/sec at a distance from the center of about 2.6*10^20m. What is the mass of the Milky Way inside the sun's orbit? (Note: In this problem, we assume that the galaxy can be treated as a sphere of matter.)
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OpenStudy (vincent-lyon.fr):
gravitiational force = Sun's mass x centripetal acceleration
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