A long rectangular copper bar under a tensile load P hangs from a pin that is supported by two steel posts as shown in figure below. The copper bar has a length of 2.0 m, a rectangular cross section of 20 mm x 200 mm, and a modulus of elasticity Ecu = 100 GPa. Each steel post has a height of 0.5 m, a rectangular cross section of 20 mm x 250 mm, and a modulus of elasticity Es = 200 GPa. Steel post A Copper- bar a.) Determine the downward displacement d of the lower end of the copper bar with respect to the base support of the steel post at point A due to a load P = 150 kN. (20 marks) b.) What is the maximum permissible load Pmax if the displacement d is limited to 1.0 mm? (5 marks)

A cylindrical bar of steel 9.9 mm (0.3898 in.) in diameter is to be deformed elastically by application of a force along the bar axis. Determine the force that will produce an elastic reduction of 3.0×10-3 mm (1.181 ×10-4 in.) in the diameter. For steel, values for the elastic modulus (E) and Poisson's ratio (v) are, respectively, 207 GPa and 0.30. i N