$2.($prior test problem$)$ A pair of tensioned cables are used to plumb one side of a small barn. If it

is known that as a result of the forces exerted by the cables on the barn at points A and D$,$ the

sum of the moments about the x$-$axis is equal to $7,500$ N$-$m$,$ determine the magnitude of TDF

when TAC $=1,300$ N$.$