Question: A long, rectangular copper bar under a tensile load P hangs from a pin that is supported by two steel posts (see figure). The copper

A long, rectangular copper bar under a tensile load P hangs from a pin that is supported by two steel posts (see figure). The copper bar has a length of 2.0 m, a cross-sectional area of 4800 mm2, and a modulus of elasticity Ec =120 GPa. Each steel post has a height of 0.5 m, a cross-sectional area of 4500 mm2, and a modulus of elasticity Es = 200 GPa.

(a) Determine the downward displacement of the lower end of the copper bar due to a load P =180 kN.

(b) What is the maximum permissible load Pmax if displacement d is limited to 1.0 mm?

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