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Taking the earth to be the uniform sphere of radius 6400km, calculate the total energy needed to raise a satellite of mass 1000kg to a height of 600km above the ground and to set it into a circular orbit at that altitude.


Given;
Radius of earth (R) = 6400 km = 6400000 m
Mass of satellite (m) = 1000 kg
Height of satellite (h) = 600 km = 600000 m
Total Energy needed (E) = ?

Energy needed = Increase in Potential Energy + Kinetic Energy at Orbit
= GMmrGMmR+12mv2
= GMmrGMmR+12mGMr                               [∵ r = R+h]

= gR2m[1R12(R+h)]     =     gm[RR22(R+h)]
= 100010[6400000(6400000)22(6400000+600000)]
= 3.471010J

∴ The total Energy needed (E) = 3.471010J

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