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H2 Physics 8 - Gravitational Fields: Geostationary Orbit Radius
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Geostationary orbit: period T = 24 h = 86400 s; gravity provides the centripetal force for circular orbit.
Set GMm / r^2 = m(4 pi^2 r) / T^2; satellite mass cancels, so r depends only on T and the central mass M.
Rearrange to Kepler's third law: r^3 = GMT^2 / (4 pi^2) = 7.52 x 10^22 m^3.
Continue H2 Physics Gravitational Fields Notes | A-Level 9478
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