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19.6: Кутовий момент системи частинок
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\[\overrightarrow{\mathbf{L}}_{A}=\sum_{j=1}^{N}\left(\overrightarrow{\mathbf{r}}_{B, j}+\overrightarrow{\mathbf{r}}_{A, B}\right) \times m_{j} \overrightarrow{\mathbf{v}}_{j}=\sum_{j=1}^{N} \overrigh... $\overrightarrow{\mathbf{L}}_{A}=\sum_{j=1}^{N}\left(\overrightarrow{\mathbf{r}}_{B, j}+\overrightarrow{\mathbf{r}}_{A, B}\right) \times m_{j} \overrightarrow{\mathbf{v}}_{j}=\sum_{j=1}^{N} \overrightarrow{\mathbf{r}}_{B, j} \times m_{j} \overrightarrow{\mathbf{v}}_{j}+\sum_{j=1}^{N} \overrightarrow{\mathbf{r}}_{A, B} \times m_{j} \overrightarrow{\mathbf{v}}_{j} \nonumber$