Orbits of planets and satellites (AQA A-Level Physics): Flashcards

$T^2 \propto r^3$

Loses GPE, gains KE

Min speed to leave gravitational influence

$v = \sqrt{\frac{2GM}{r}}$

Independent of object's mass

Period matches rotation period of orbited object

Above equator, 24h period, fixed position above Earth

42,000 km

TV broadcasting & telecommunications

Faster; for weather monitoring, Earth observation, military