Why satellite is placed at a distance of 36000 km from the earth?

Question

My sir asked us to find out the answer for this question. i just want to know the perfect reason. Pls find this for me.

Answer 1

At this altitude, the satellite orbit exactly matches the earth's rotation. This is important for ground stations that need to be able to look at the same satellite continuously, such as TV satellite receivers.

Suppose you'd have a TV relaying station on the moon:
-1- a part of the month you couldn't watch TV because you couldn't see the moon
-2- you'd need to adjust your antenna every minute or so
-3- and -4- the uploader has the same problems

Satellites at 36000 KM above the equator are visible from a relatively small amount of earth. For instance: only the two America's, or only Europe and Africa.

There are many satellites not at 36000 KM. Often those do not orbit the earth above the equator either. Examples would be the GPS satellites, Galileo, weather satellites, and so on. These satellites cover the entire earth, just not during 24 hours a day for each different place. Some collect information (weather satellites in orbit over the poles), some work together with several other satellites (GPS).

Answer 2

Satellite Distance From Earth

Answer 3

The higher the satellite is above the Earth, the slower it orbits. Satellites at low altitude, like the International Space Station, orbit the Earth once every hour and a half. The higher you go, the longer it takes to complete one orbit. The Moon takes a whole month to complete one orbit. But at 36,000km, any satellite will take 24 hours to complete one orbit. Since the Earth rotates on its axis once in 24 hours, such a satellite can just keep pace with the Earth's rotation and always stay above the same place on the ground. This is highly useful if you want to use the satellite as a radio station because you always know where it is, as if it were on a 36,000 km tall tower instead of flying free.

Answer 4

The vast majority are not.

However, geostationary satellites must be placed over the equator and at this altitude - it is the only altitude where the orbital speed exactly keeps pace with the rotating earth.

Answer 5

Actually,only geostationary satellites r placed at height of 36000 km,b'coz angular speed of these satellite r synchronised wid angular speed of earth about its axis,therefore these satellites appear to be stationary wrt to any point on surface of earth.clearly time period of such satellites r 24 hr b'coz time period of earth is also 24hr,
now for finding the height of such satellites we use relation
h={[9.8(t^2)(r^2)/(4*9.28)]^(1/3)}-r
h=height,t=time period,r=radius of earth.
and this relation gives us 36000 km

Answer 6

At this height of 36000km , it will remain geostationary meaning always above a particular point of the equator on the earth.

Answer 7

becoz after 36000km d eart's gravitational power decreases so ders no doubt whether d satellite might fall on eart back