1.

In a double star system , two stars of masses m_(1) and m_(2) seperated by a distance d rotate about about their centre of mass. Then their common angular velocity would be

Answer»

`sqrt((Gm_(1))/(d^(3)))`
`sqrt((Gm_(2))/(d^(3)))`
`sqrt((G(m_(1) + m_(2)))/(d^(3)))`
`sqrt((d^3)/(G(m_(1)+m_(2))))`

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