Tiang Penyangga

Tegangan tali

\begin{equation*}
\begin{split}
& \Sigma \tau = 0 \\\\
& T \:.\: 6 \sin 30^{\text{o}} - w_B \:.\: 3 - w_p \:.\: 6 = 0 \\\\
& T \:.\: 6 \sin 30^{\text{o}} = w_B \:.\: 3 - w_p \:.\: 6 \\\\
& T \:.\: 6 \:.\; \frac 12 = 20 \:.\: 3 + 60 \:.\: 6 \\\\
& T \:.\: 3 = 420 \\\\
& T = 140 \text{ N}
\end{split}
\end{equation*}

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