PSLV series satellites are polar satellites of India.
Orbital Velocity
Orbital velocity of a satellite is the minimum velocity required to the satellite into a given orbit around earth.
Orbital velocity of a satellite is given by vo = √GM / r = R √g / R + h
where, M = mass of the planet, R = radius of the planet and h = height of the satellite from planet’ s surface.
If satellite is revolving near the earth’ s surface, then r =( R + h) =- R Now orbital velocity,
vo = √gR = 7.92km / h
if v is the speed of a satellite in its orbit and vo is the required orbital velocity to move in the orbit, then
( i) If v < vo, then satellite will move on a parabolic path and satellite falls back to earth.
( ii) If V = vo then satellite revolves in circular path / orbit around earth.( iii) If vo < V < ve then satellite shall revolve around earth in elliptical orbit.
Energy of a Satellite in Orbit Total energy of a satellite E = KE + PE
= GMm / 2r +(- GMm / r) = – GMm / 2r