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2.9 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

2.9 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 * 10 ^ 6 psi for steel and 10 * 10 ^ 6 psi for aluminum

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