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`        is the orbital velocity the minimum  launching velocity for making the satellite revolve around the earth as  definiton says ?If it is so the acc. 2 the eqn. , v0=R(g/R+h)^1/2 , if  the destination orbit is higher, the the orbital velocity, ie the  minimum launching velocity must be lower??HOW CAN IT BE SO??OR Is it  like this ;As the satellite advances into more height, the velocity  should decrease,(ie , it should be programmed accprdingly) so as to  reach the fixed destination orbit which means that the orbital velocity  is a variable??? PLZ EXPL`
7 years ago

SAGAR SINGH - IIT DELHI
879 Points
```										Dear student,
Orbital  Velocity is the  velocity which is give to an artificial earth's satellite a few hundred  kilometers above the earth's surface so that it may start revolving  round the earth. It is denoted by Vo.
Expression for orbital  velocity
Let, m = Mass of satellite
r = radius of circular orbit of satellite
h = height of satellite above surface of earth.
Vo = orbital  velocity
M = Mass of the earth.
The

required by the satellite to keep moving in a circular orbit is produced by the gravitational force

between the satellite and the earth. Therefore,

Here r=R+h
Let gh be the  acceleration due to gravity at heigh h
Therefore, weight of satellite = Mgh
Force of attraction between body (Satellite) and earth must be balance by weight of satellite.

All the best.
Win exciting gifts by  answering the questions on Discussion Forum. So help discuss any query  on askiitians forum and become an Elite Expert League askiitian.

Sagar Singh
B.Tech, IIT Delhi

```
7 years ago
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