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A steel control rod is 5.5 ft long and must not stretch more than 0.04 in. when a 2-kip tensile load is applied to it.

A steel control rod is 5.5 ft long and must not stretch more than 0.04 in. when a 2-kip tensile load is applied to it. Knowing that E = 29 × 106 psi, determine 


(a) the smallest diameter rod that should be used, 


(b) the corresponding normal stress caused by the load.

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