Extracted text: A 14 mm diameter steel (E - 213 GPa) rod (2) is connected to a 23-mm wide by 11-mm thick rectangular aluminum (E - 60 GPa) bar (1), as shown. Assume l-0.7m and L-142 m. Determine the force Prequired to stretch the assembly 6.9 mm. (1) (2) kN.