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4. The formula for axial displacement of a bar we developed for trusses EA is only valid when the internal force F is constant in the member a (4 points). Develop an equation for Δ in the case where F varies as a function of position. Hint: is you take a small length dr as shown above in Figure (a), F is nearly constant, and you can say F, Fdr where dA is the change in length of that small segment of initial length dr b (8 points). Solve for the displacement at point B of the bar above using the formula you developed (if you cannot solve part a, make a reasonable guess). Assume EA is constant and leave your answers in terms of EA.

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EA t (G4) U) Aん

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