Consider the truss shown in $($Figure $1).$ Assume the members

are pin connected at their end points. Take $A=4\mathrm{.}5$ in ${?}^2$ and

$E=29({10}^3)ksi$ for each member.

Figure

Correct

Here we learn how to determine the correct equation of the method of virtual work for the displacement in trusses.

Determine the vertical displacement of joint A measured downward. Use the method of virtual work.

Express your answer in inches to three significant figures. Enter a positive value if the displacement is downward and a negative value if

the displacement is upward.

View Available Hint$($s$)$

${}_{Av}=$

in$.$