Consider the truss shown in $($Figure $1).$ For each member

$A=400m{m}^2,E=200$GPa

Figure

$1$ of $1$

Part A

Choose the correct equation of the method of virfual work for the displacement in trusses.

$1*={\displaystyle \underset{?}{\overset{?}{}}}\frac{\text{N}\text{A}\text{E}}{nL}$

$1*={\displaystyle \underset{?}{\overset{?}{}}}\frac{nNL}{AE}$

$1*={\displaystyle \underset{?}{\overset{?}{}}}N(\frac{\text{d}\text{e}\text{l}\text{N}}{\text{d}\text{e}\text{l}\text{P}})\frac{AE}{L}$

$1*={\displaystyle \underset{?}{\overset{?}{}}}N(\frac{\text{d}\text{e}\text{l}\text{N}}{\text{d}\text{e}\text{l}\text{P}})\frac{L}{AE}$

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Correct

Part B

Deter$$ine the vertical displacement of joint $B$ measured downward. Use the method of virtual work

Express your answer to three significant figures and include the appropriate units. Enter positive value if the

displacement is downward and negative value if the displacement is upward.

${}_{Bv}=$

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