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Three identical stars of mass (m) rotate in a perfect circle of radius (r) about their...

Three identical stars of mass (m) rotate in a perfect circle of radius (r) about their center of mass. If they are equally spaced out along this circle, such that the stars form an equilateral triangle, what is the period of their rotation (T)?

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In this question we have to find the time period of rotation of the stars.

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