In Figure P17.58/59, the truss is subjected to concentrated loads P D = 66 kN and P E = 42 kN. Members AB, AC, BC, and CD each have a cross-sectional area of A = 1,500 mm 2 . Members BD, BE, and DE...

In Figure P17.58/59, the truss is subjected to concentrated loads P_D
= 66 kN and P_E
= 42 kN. Members AB, AC, BC, and CD each have a cross-sectional area of A = 1,500 mm². Members BD, BE, and DE each have a cross-sectional area of A = 600 mm². All members are made of steel [E = 200 GPa]. For the given loads, use the virtual-work method to determine the horizontal displacement of (a) joint E, and (b) joint D.