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A wood post has a modulus of Elasticity, E, of 1.3x106 psi. It is 20 ft...

A wood post has a modulus of Elasticity, E, of 1.3x106 psi.
It is 20 ft long and experiences a change in length of 0.25 in.
Determine the average unit stress in the post. Assume a linear
stress-to-strain relationship.

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