Which of the following best explains why a geostationary satellite must circle the…
PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
Which of the following best explains why a geostationary satellite must circle the Earth directly above the equator?
(a) An equatorial orbit minimises atmospheric drag acting on the satellite.
(b) Only an equatorial orbit has the same direction and angular speed as Earth’s rotation.
(c) Effective gravity is weakest at the equator, so the satellite can match the required speed with less velocity.
(d) The satellite must stay above the equator to conserve the extra tangential speed gained from being launched near the equator.