4.A 7075-T651 aluminum alloy specimen with a diameter of 0.500 in. and a 2.0 in. gage length was tested to fracture. The load and deformation data obtained during the test are given below. First plot the stress-strain curve associated with the data using Excel, MATLAB, etc. (your choice, but not by hand) and then determine: a. The modulus of elasticity. b. The proportional limit. c. The yield strength (0.20% offset).

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.