Satellite|What is geostationary satellite |What are the types of satellite |Satellite Motion Physics | Uses of satellite |

 Satellite

What is satellite and satellite easy definition ?

 In Physics, An object revolving around the planet in a particular orbit is called satellite. There are two types of satellite are  Natural satellite and Artificial satellite.

The moon is a natural satellite of the earth.The manmade satellite like Aryabhatta ,Nirbhaya , Chandrodaya etc. revolving around the earth are known as artificial satellite.

Launching of satellite

1 . For projection of satellite minimum two stage rocket is used the satellite is keeping at  the tip of the rocket and the first stage of fuel is ignited on the surface of the Earth  so that rocket rises to a desired height above the surface of Earth.

2 . When satellite attains desired height the first stage of rocket is detached and the rocket is rotated to 90 degree with the help of remote control.

3 . After that the fuel in the second stage of rocket is ignited so that it is projected in horizontal direction.

4 . When the fule in the second stage is completely burnt the second stage also getting detached from the satellite the resulting motion of the satellite depend upon the velocity of projection given to it.

Velocity of satellite 

Critical velocity/Orbital velocity

The minimum horizontal velocity of projection given to a satellite and certain height so that it can revolve in circular orbit around the earth is called critical velocity.

Escape velocity

The minimum velocity with which a body should be projected from the surface of the earth so that its kept from the Earth gravitational field is called escape velocity.

What are the types of satellite ?

Communication satellite / geostationary satellite

What is geostationary satellite ?

An artificial satellite revolving in a circular orbit in the equatorial plane in the same sense of rotation of the earth and having same period of revolution as a period of Earth is called geostationary satellite and communication satellite.

The relative velocity of such satellite with respect to Earth is zero , it appears stationary from earth surface it is known as geostationary or geosynchronous satellite. It is mainly used for communication purpose so called communication satellite.

Polar satellite

Polar satellite the type of satellite around the earth always in the direction of North-South. Polar satellite is that opposite of geostationary satellite which is in the direction of East and West . Polar satellite is used to predict the weather and it is usually used as a relay station. Polar satellite is the man made satellite or artificial satellite.

Satellite Motion Physics / Projection of satellite

1. If velocity of projection is equal to critical velocity (V = Vc) then satellite moves in a circular orbit around the earth.

2. Velocity of projection is greater than a critical velocity but less than escape velocity (Vc<V<Ve)  then satellite perform and elliptical orbit which is apogee will be greater than the projection of height.

3. Velocity of projection is equal to escape velocity (V=Ve) then satellite moves in parabolic path.

4. Is velocity of projection is  greater than escape velocity (V>Vc) then Orbit it will be hyperbolic and it will be escaped from the Earth gravitational field.

5. If V is less than Vc then satellite move in elliptical Orbit in the atmosphere near to the earth and it will tents to strike to the surface of Earth.

What is the Uses of satellite ?

1. Satellite is used to transfer transmission of TV  and radio signal over the large area.

2. Satellite is used to broadcasting the communication by giving MOBILE NETWORK on mobiles phones.

3. Satellite is also used for the military purpose on the border.

4. It is also used for weather forecasting to predicting the climate and the environment forecast.

5 . Satellite it is used for or Geo position system (GPS) .

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