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Grade: 11


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

9 years ago

Answers : (1)

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.

R = radius of earth

Vo = orbital velocity

M = Mass of the earth.


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.

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Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

9 years ago
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