The truss is loaded by a vertical point force F. The rods of the truss have the same Young's modulus E and second moment of area I. The cross section of the rod is a circle. a) Define rod forces in symbolic form. (2 p.) b) Determine the symbolic expression for the vertical load Fer to be designed in terms of the deflection of the rod. (Hint: Observe which compressed bar gives the lowest value of vertical load in terms of buckling.) (2 p.) c) Calculate the numerical value of the vertical buckling load For when a 3 m, E = 10000000 kN/m and I = 1/12500 m. (1 p.) A F B * x a D * a E P P P a EI EI EI EI EI L =0,25 =1 =1 = 2,046 = 4