[填空题]
Geostationary satellites are satellites that complete one circular orbit in the same amount of time it takes for the Earth to rotate once on its axis. A geostationary satellite is placed in an orbit at $3.6\times10^7\,m$ above the Earth's surface, at the equator. The radius of the Earth is $6.4\times10^3\,km$.
The satellite undergoes uniform circular motion.
1.Define gravitational field strength.
2.Show that the linear speed of the satellite is approximately $2.6\times10^3\,ms^{-1}$. v = $\times10^3\,ms^{-1}$
3.Calculate the gravitational field strength at the point in the orbit of the satellite. g = $\times10^{-1}\,ms^{-2}$
