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user 95876
Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.
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Central force law
Perhaps I can help.
For any object in orbit, the Earth exerts a force on the object and the object exerts a force on the Earth.
So we know from $F=ma$ that:
$$∑ F_θ=ma_θ$$
Using polar coordinates …
- 21
0
votes
1
answer
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In central-force mechanics, how do we substitute $ξ=\frac{1}{r}$?
I have taken a look at central-force mechanics in the past, but I still cannot understand how $ξ=\frac{1}{r}$ is substituted to find $\frac{d^2r}{dt^2}$ in terms of ξ.
So I know from $F=ma$ that:
$$ …
- 21