Answer to Question #185856 in Physics for christian espiritu

Question

Two satellites orbit the Earth at the same altitude in circular orbits. One satellite has a mass of 250 kg, and the other has a mass of 150 kg. The orbital speed of the larger satellite is  

Answer 1

Considering a circular orbit with the center-of-mass distance of 8000 km, the orbital speed of the larger satellite is  

$$v=\sqrt{\frac{G(M+m)}{r}}=7074\text{ m/s}.$$