The two sides of a V-shaped water trough are hinged to each other at the bottom where they meet, as shown in the figure, making an angle of $45^{\circ}$ with the ground from both sides. Each side is $L=0.75$ $m$ wide, and the two parts are held together by a cable and turnbuckle placed every $7$ $m$ along the length of the trough. Calculate the tension in each cable when the trough is filled to the rim. $T$ $N$