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(C) Consider the free body diagram of point $B$. Let the tensions in sections $BC$ and $BF$ be $T_1$ and $T_2$ respectively. The force applied by sect

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$10 \,N, 10 \,N$

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(C) Consider the free body diagram of point $B$. Let the tensions in sections $BC$ and $BF$ be $T_1$ and $T_2$ respectively. The force applied by section $AB$ is $T = 10 \,N$.
According to Lami's theorem at point $B$:
$\frac{T_1}{\sin 120^\circ} = \frac{T_2}{\sin 120^\circ} = \frac{T}{\sin 120^\circ}$
Since the angles between the forces are all $120^\circ$,we have:
$T_1 = T_2 = T = 10 \,N$.
Therefore,the tensions in sections $BC$ and $BF$ are both $10 \,N$.

The adjacent figure shows a part of a horizontally stretched net. Section $AB$ is stretched with a force of $10 \,N$. The tensions in the sections $BC$ and $BF$ are

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