Derive expression for total energy of orbiting satellite
Answers
The kinetic energy or total energy of an object in orbit can be found from the following equations:
We know that,
The Centripetal force on a satellite of mass 'm' moving at velocity ' v ' in an orbit of radius r is
F = mv^2/r
But this is equal to the gravitational force ' F ' between the planet mass of M and the satellite. So, we get,
F =GMm/r^2 and
mv^2= GMm/r
But,
kinetic energy = ½mv^2
So,
Satellite's kinetic energy = ½ GMm/r
Orbit's kinetic energy = ½ mv^2 = + ½GMm/r
All satellites have to be given a tangential velocity ' v ' to maintain their orbit position by the process that is called orbit injection.
Total energy of satellite in orbit = -GMm/2r
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