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OpenStudy (anonymous):
In recent years, a number of nearby stars have been found to possess planets. Suppose, the orbital radius of such a planet is found to be 3.8 1011 m, with a period of 980 days. Find the mass of the star.
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OpenStudy (anonymous):
use this formula : \[M=v^2 r/G -----> M=r^3*(2*\pi/T)^2/G\]
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