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PAU Physics (Cantabria) Practice Questions - Cantabria PAU Physics 2026 (Pruebas De Acceso A La Universidad, Universidad De Cantabria) Exam

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According to Kepler's Third Law ($T^2 / a^3 = k$), if Planet A orbits a star at distance $r$ with orbital period $T$, what is the orbital period of Planet B orbiting the same star at a distance of $4r$?
Correct Answer:
8T

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