7.19 A satellite orbits the earth at a height of 400 km above the surface

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

7.19 A satellite orbits the earth at a height of 400 km above the surface. How much energy must be expended to rocket the satellite out of the earth's gravitational influence? Mass of the satellite =200 kg=200 \mathrm{~kg}; mass of the earth =6.0×1024 kg=6.0 \times 10^{24} \mathrm{~kg}; radius of the earth =6.4×106 m;G=6.67×10−11 N m2 kg−2=6.4 \times 10^{6} \mathrm{~m} ; G=6.67 \times 10^{-11} \mathrm{~N} \mathrm{~m}^{2} \mathrm{~kg}^{-2}.

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