$1\mathrm{.}2$ A structural beam $AC$ is shown in Fig. $1\mathrm{.}2.$ Point $A$ is a pin support. Points $B$ and $C$ are connected with a cable, hanging over a smooth pulley. Neglect the self$-$weight of the beam. Determine the tension force in the cable and reactions at the sup

port $A.$

Fig. $1\mathrm{.}2$

Why do we have Tension at point B as

Tb $*2*0\mathrm{.}75=3\mathrm{.}5*0\mathrm{.}75$