Question: Consider the truss shown in ( Figure 1 ) . Assume the members are pin connected at their end points. Take A = 5 .

Consider the truss shown in

(

Figure

1) .

Assume the members are pin connected at their end points. Take

A = 5.5 i n^{2}

and

E = 29 (10^{3}) k s i

for each member.

Figure

1

1

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

Part B

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.

A

vec

?

.

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