The position from the center of the earth:
xe = 0 km (distance of earth from earth), xm = 384400 km (distance of moon from earth), Me = 5.972 × 1024 kg (mass of earth), and Mm = 7.34767 × 1022 kg (mass of moon)
(a) How far is the center of mass of the Earth-Moon system from the center of the Earth? (Appendix C gives the masses of the Earth and the Moon and the distance between the two.)
(b) Express the answer to (a) as a fraction of the Earth's radius.
(Rcm / Rearth) =
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