The beam is supported by two rods $AB,$ and $CD$ that have cross$-$sectional areas of $14m{m}^2$ and $9m{m}^2,$ respectively. Take $d=1m($Figure $1)$

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Determine the average normal stress in rod $AB.$

Express your answer to three significant figures and include the appropriate units.

${}_{AB}=$

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Part B

Determine the average normal stress in rod $CD.$

Express your answer to three significant figures and include the appropriate units. $$

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