Example $5\mathrm{.}6$ Find the value of $W,$ which is required to maintain equilibrium configuration as

shown in Figure $5\mathrm{.}12($a$).$ Its free$-$body diagram is shown in Figure $5\mathrm{.}12($b$).$

Figure $5\mathrm{.}12$ Example $5\mathrm{.}6.$

Figure $5\mathrm{.}13$ Example $5\mathrm{.}6$: Free$-$body diagram.