Planet a dan b memiliki kala revolusi Ta=405 hari. Jika perbandingan jarak rata-rata ke matahari ra:rn = 9:16, maka kala revolusi planet b?

Diket :
Ta = 405 hari
Ra : Rb = 9 : 16

Tanya :
Tb = _?

Jawab :
(Ta/Tb)^2 = (Ra/Rb)^3
(405/Tb)^2 = (9/16)^3

(405/Tb) = (3/4)^3

(405/Tb) = 27/64

Tb = (64/27)• 405
Tb = 960 hari

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FZA