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

2. Relevant equations

on image

3. The attempt at a solution

The first thing I did was use the second equation to get

Theta dot = L/mr^{2}

Which I then subbed into the first equation to eliminate Theta dot.

Now I need everything in terms of r, and this is where I get stuck.

If I just find the second derivative of r (r double dot), then sub it back in, Im left with all kinds of Thetas, but I need f as a function of r.

How do I proceed here? Any help is greatly appreciated!! Thanks!

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# Homework Help: Finding the Central Force Given the Orbit

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