The vertical and horizontal forces (reactions) at joints A and B of a typical cable of the sus- pension bridge shown in Fig. 8.26 are given by F, = 2.8 x 106 N and F, = 1.1 x 106 N. The cables are made of steel with a weight density of 76.5 kN/m. If the effective diameter of the cable is 25 cm, find the first two natural frequencies of vibration of the cable in the vertical direction. State the assumptions involved in the solution. Floor Tower Cables h = 50 m 1-span 500 m B D Tower