Hunting a black hole. Observations of the light from a

Chapter , Problem 54

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Hunting a black hole. Observations of the light from a certain star indicate that it is part of a binary (two-star) system.This visible star has orbital speed v ! 270 km/s, orbital period T ! 1.70 days, and approximate mass m1 ! 6Ms, where Ms is the Suns mass, 1.99 $ 1030 kg.Assume that the visible star and its companion star, which is dark and unseen, are both in circular orbits (Fig. 13-47). What integer multiple of Ms gives the approximate mass m2 of the dark star?

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