Question #160155
Assuming that the planets are moving in circular orbits, apply Kepler's laws to show that the acceleration of a planet is inversely proportional to the square of its distance from the sun.
1
Expert's answer
2021-02-15T17:43:46-0500

Answer

Let us suppose

the planets are moving in circular orbits.

So gravitational force can be written as

F=GMmr2F=\frac{GMm}{r^2} ...... 1

Force is given as

F=maF=ma ...... 2

Using both equation

F=ma=GMmr2F=ma=\frac{GMm}{r^2}

a=GMr2a=\frac{GM}{r^2}

So acceleration

a1r2a\propto\frac{1}{r^2}



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