Geostationary Satelliets Are Placed In Orbits Of Radius 4.2*10^4km,use The Information To Deduce g At That Height?

Answer 1

Radius of Earth.

r = 6 370 km

Radius of Orbit:

R = 4.2 * 10 ^ 4 km = 42 000 km

h = R - r = 42 000 - 6 370 = 35 630 km = 3.563 * 10 ^ 4 km

Answer 2

g = k M/r^2

g at 42*10^3 / g at 6.37*10^3 = (6.37/42)^2