Determine the average normal stress in members $AB.$

The bars of the truss each have a cross$-$sectional area of

$1\mathrm{.}00$ in ${?}^2.$ The loading is $P=7\mathrm{.}4$kip. $($Figure $1)$

Figure

Express your answer to three significant figures and include appropriate units. If the bar is under tension, give your answer as a positive value; if

the bar is under compression, give your answer as a negative number.

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Part B

Determine the average normal stress in members $BD.$

Express your answer to three significant figures and include appropriate units. If the bar is under tension, give your answer as a positive value; if

the bar is under compression, give your answer as a negative number.

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Part C

Determine the average normal stress in members $CE.$