A 40-mm diameter bar ABC is composed of an aluminum part AB and a steel part BC (Fig. P2...

A 40-mm diameter bar ABC is composed of an aluminum part AB and a steel part BC (Fig. P2.27). After axial force P is applied, a strain gage attached to the steel measures normal strain at the longitudinal direction as . Determine (a) the magnitude of the applied force P; (b) the total elongation of the bar if each material behaves elastically. Take