绕行周期为T,则线速度为:V=2πh/T
(1)GMm/(R+h)^2=mV^2/(R+h),带入V,得M=4π^2h^2(R+h)/GT^2
(2)g=GM/R^2=4π^2h^2(R+h)/T^2R^2
(3)
后面不知道怎么做了,呵呵