(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

By considering the centripetal force which acts on a planet in a cirlar orbit, show that T^2[tex]\propto[/tex]R^3, where T is the time taken for one orbitaround the Sun and R is the radius of the orbit.

2. Relevant equations

Fc=GMm/r^2

1/2Mv^2=GMm/r^2

3. The attempt at a solution

I showed that F[tex]\propto[/tex]1/d^2 but then could not incorporate R^3 into the equation.......

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# Homework Help: Keplers Third Law

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