BITSAT2011PhysicsGravitationActual
Geo-stationary satellite is one which
Options
- Aremains stationary at a fixed height from the earth's surface
- Brevolves like other satellites but in the opposite direction of earth's rotation
- Crevolves round the earth at a suitable height with same angular velocity and in the same direction as earth do
- DNone of these
Correct answer
C. revolves round the earth at a suitable height with same angular velocity and in the same direction as earth do
Step-by-step solution
Geo-stationary satellites are also called synchronous satellite. They always remain about the same path on equater, i.e., it has a period of exactly one day (86400 sec ) So orbit radius ( T =2 r ³ GM ) comes out to be 42400 ~km , which is nearly equal to the circumference of earth. So height of Geostationary satellite from the earth surface is 42,400-6400=36,000 ~km .