1. A 4-mm-diameter steel wire, 3.2 m long, carries an axial tensile load P. Find the maximum safe value of P if the allowable normal stress is 280 MPa and the elongation of the wire is limited to 4 mm. Use E = 200 GPa.
2. The compound bar ABCD has a uniform cross-sectional area of 0:25 in: 2 When the axial force P is applied, the length of the bar is reduced by 0.018 in. Determine the magnitude of the force P. The moduli of elasticity are 29 × 106 psi for steel and 10 × 106 psi for aluminum.
