[填空题]
A satellite of mass 550lhb t j;+9wb/s0 kg orbibk5a0utbz,, yts the Earth $ \left(\operatorname{mass}=6.0 \times 10^{24} \mathrm{~kg}\right)$ and has a period of 6200 s . Find (a) the magnitude of the Earth's gravitational force on the satellite, $\approx$ $\times 10^4$
(b) the altitude of the satellite. $\times 10^5$
