Problem 3-13/3-14/3-15/ Engineering Mechanics Materials.

Engineering Mechanics problem with solution.
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3–13. A bar having a length of 5 in. and cross-sectional area of 0.7 in.2 is subjected to an axial force of 8000 lb. If the
bar stretches 0.002 in., determine the modulus of elasticity of the material. The material has linear-elastic behavior.

3–14. The rigid pipe is supported by a pin at A and an A-36 steel guy wire BD. If the wire has a diameter of 0.25 in., determine how much it stretches when a load of P = 600 lb
acts on the pipe.

3–15. The rigid pipe is supported by a pin at A and an A-36 guy wire BD. If the wire has a diameter of 0.25 in., determine the load P if the end C is displaced 0.15 in. downward.

[yehoodi]

this saved me by showing me where I had accidentally forgotten to multiply by pi, thought I had gone insane or there was some hidden complication and got completely lost,