Question $2$: Value of B$=4\mathrm{.}9$

The transmission tower truss in Figure $2$ is pin supported at A and roller supported at H$.$ The truss is subjected to the load $P=0\mathrm{.}5**B(kN)$ The dimensions of the truss are $L_1=0\mathrm{.}2**B(m),L_2={0\mathrm{.}3}^{**}B(m)$ and $L_3={0\mathrm{.}4}^{**}B(m).$

Compute the force in members BC and CJ by the method of sections.