Three evenly spaced vertical steel bars support a rigid horizontal block with load P (including self-weight) applied to it, as shown in Figure Q5. The two outer rods have diameter d and length L, and the inner bar has diameter 2d/3 and length 2L/3. (a) Write down the compatibility equation concerning the deformation of the outer and inner bars. (3 marks) (b) Write down the equilibrium equation concerning the loads in the outer and inner bars and the load P. (3 marks) (c) What percentage of the load P is carried in the outer bars?