An overhung diving board is shown in Figure P14-1a. A 100-kg person is standing on the free end in the center of its width. Assume cross-sectional dimensions of 305 mm X 32 mm and a material = 10.3 GPa. What are the spring rate and fundamental natural frequency of the diver-board combination?

 Design a helical compression spring for a static load of 45 lb at a deflection of 1.25 in with a safety factor of 2.5. Use = 7.5. Specify all parameters necessary to manufacture the spring.