A uniform beam of length L = 2.9 m and mass M = 26 kg has its lower end fixed to pivot at a point P on the floor, making an angle of 23∘. A horizontal cable is attached at its upper end to a point on a wall. A box of the same mass M as the beam is suspended from a rope that is attached to the beam one-fourth L from its upper end. Write and expression for the tension T in the horizontal cable.