The truss shown in Figure P17.55/56/57 is constructed from aluminum [E = 70 GPa; C] members that each have a cross-sectional area of A = 750 mm 2 . Use the virtual-work method to determine the...

The truss shown in Figure P17.55/56/57 is constructed from aluminum [E = 70 GPa;
C] members that each have a cross-sectional area of A = 750 mm². Use the virtual-work method to determine the vertical displacement of joint A for the following two conditions: