Lagrangepunt: verschil tussen versies

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Regel 65:
<math>
\begin{align}
\frac{G M_{sun}}{d^2} \left(1 - \frac{x}{d}\right)^{-2} - \frac{G M_{earth}}{x^2} &= \frac{4 \pi^2 d}{T^2} \left(1 - \frac{x}{d}\right)\\
\text{Binomiaal ontwikkeling van } \left(1 - \frac{x}{d}\right)^{-2} \approx 1 - 2 \left(- \frac{x}{d}\right) = 1 + 2 \frac{x2x}{d}\\
\Leftrightarrow \frac{G M_{sun}}{d^2} \left(1 + 2 \frac{x2x}{d}\right) - \frac{G M_{earth}}{x^2} &= \frac{4 \pi^2 d}{T^2} \left(1 - \frac{x}{d}\right)\\
\text{Na subsitueren van de periode van de aarde bekomen we}\\
\Leftrightarrow \frac{G M_{sun}}{d^2} \left(1 + 2 \frac{x2x}{d}\right) - \frac{G M_{earth}}{x^2} &= \frac{4 \pi^2 d}{(\sqrt{\frac{4 \pi^2 d^3}{G M_{sun}}})^2} \left(1 - \frac{x}{d}\right)\\
\Leftrightarrow \frac{G M_{sun}}{d^2} \left(1 + 2 \frac{x2x}{d}\right) - \frac{G M_{earth}}{x^2} &= \frac{G M_{sun}}{d^2} \left(1 - \frac{x}{d}\right)\\
\Leftrightarrow \frac{G M_{sun}}{d^2} \left(1 + 2 \frac{x2x}{d}\right) - \frac{G M_{sun}}{d^2} \left(1 - \frac{x}{d}\right) - \frac{G M_{earth}}{x^2} &= 0\\
\Leftrightarrow \frac{G M_{sun}}{d^2} \left(3 \frac{x3x}{d}\right) - \frac{G M_{earth}}{x^2} &= 0\\
\Leftrightarrow \frac{G M_{sun}}{d^2} \left(3 \frac{13}{d}\right) &= \frac{G M_{earth}}{x^3}\\
\Leftrightarrow \frac{M_3M_{sun}}{M_{earth} d^3} 3 &= \frac{1}{x^3}\\
\Leftrightarrow \frac{M_{earth} d^3}{3 M_{sun}} &= x^3\\
\Leftrightarrow x &= \left(\frac{M_{earth}}{3 M_{sun}}\right)^{1/3} d\\
\end{align}
</math>