Oblicz stosunek okresów obiegów Ziemi dla dwóch satelitów, jeśli promień orbity pierwszego satelity wynosi r, a drugiego 4r.
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dane r1=r, r2=4r
szukane: T1/T2
III prawo Keplera
[r1/r2]3 = [T1/T2]2
[T1/T2]2 = [r/4r]3 = [0,25]3 = 0,015625
T1/T2 = 0,125 = 1 : 8