(b) A timber be timber beam of rectangular section has a span of 4 m and is simply supported at its ends. It required to carry a total of 45KN uniformly distributed over the whole span. Find the values of the breadth (6) and depth (d) of the beam, if maximum bending stress is not to exceed 7 Mpa and maximum deflection is limited to 9.5mm. Take E for timber as 10.5 GPa (10 marks) (a) A leaf spring 750mm long is required to carry a central point load of 8 kN. If the central deflection is not to exceed 20mm and the bending stress is not greater than 200Mpa, determine the thickness, width and number of plates. Also compute the radius, to which the plates should be curved. Assume width of the plate is 12 times its thickness and E-200Gpa. (8 marks)