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25.5: Орбіти двох тіл
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\[\overrightarrow{\mathbf{r}}_{1}^{\prime}=\overrightarrow{\mathbf{r}}_{1}-\overrightarrow{\mathbf{R}}_{\mathrm{cm}}=\overrightarrow{\mathbf{r}}_{1}-\frac{m_{1} \overrightarrow{\mathbf{r}}_{1}+m_{2} \... $\overrightarrow{\mathbf{r}}_{1}^{\prime}=\overrightarrow{\mathbf{r}}_{1}-\overrightarrow{\mathbf{R}}_{\mathrm{cm}}=\overrightarrow{\mathbf{r}}_{1}-\frac{m_{1} \overrightarrow{\mathbf{r}}_{1}+m_{2} \overrightarrow{\mathbf{r}}_{2}}{m_{1}+m_{2}}=\frac{m_{2}\left(\overrightarrow{\mathbf{r}}_{1}-\overrightarrow{\mathbf{r}}_{2}\right)}{m_{1}+m_{2}}=\frac{\mu}{m_{1}} \overrightarrow{\mathbf{r}} \nonumber$