Physics

Problem

![](https://storage.googleapis.com/diraq-contents/question-bank/question-images/25ef2e474617/2025_11_20_928013a02c702487609fg-03.jpg) 13. Two identical stars, a fixed distance D apart, revolve in a circle about their mutual center of mass, as shown above. Each star has mass M and speed

v

. G is the universal gravitational constant. Which of the following is a correct relationship among these quantities? (A)

v^{2}=\mathrm{GM} / \mathrm{D}

(B)

v^{2}=\mathrm{GM} / 2 \mathrm{D}

(C)

v^{2}=\mathrm{GM} / \mathrm{D}^{2}

(D)

v^{2}=\mathrm{MGD}

(E)

v^{2}=2 \mathrm{GM}^{2} / \mathrm{D}

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