本题目来源于试卷: gc physics textbook chapter 5 problems，类别为 通用国际物理
[问答题]
Show that if a satellite orbits very near thed:u: qyjnaz 4522e boa surface of a planet with period hgwm5dtu 44at r*:tk) T , the density (ma*k4ma r:)tt gth5ud4w ss/volume) of the planet is $\rho=m / V=3 \pi / G T^{2}$ .
(b) Estimate the density of the Earth, given that a satellite near the surface orbits with a period of about 85 min .
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