Use Virtual Work Method to answer the questions below considering the truss shown in the figure. Assume A = 1200 mm?, E = 200 GPa and a = 12 x 106 / °C a. Axial force on member ED from the real structure in kN. Put (-) negative sign if it's under compression. b. Axial force on member AE from the virtual structure for the vertical displacement at joint A. c. Vertical displacement of joint A in mm due to external force only. Put negative sign if its downward. d. Vertical displacement of joint A in mm due to -100 °C change in temperature in members AE and ED. Don't add deflection due to external loads or fabrication error. Put negative sign if its downward. D E 4.2 m A B 5 kN 6.4 kN 4.2 m 4.2 m

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Dimensional homogeneity

The term dimensional homogeneity means that in an equation, the dimensions of each term on both sides are equal, which means the dimensions of the left-hand side (LHS) of an equation are similar to the dimensions of the right-hand side (RHS). For a dimensionally homogeneous equation, the powers of fundamental dimensions will be identical on both sides of the equation.