A steel bar AD (see figure) has a cross-sectional area o
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A steel bar AD (see figure) has a cross-sectional area of 0.40 in.2 and is loaded by forces P1 2700 lb, P2 1800 lb, and
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A steel bar AD (see figure) has a cross-sectional area of 0.40 in.2 and is loaded by forces P1 2700 lb, P2 1800 lb, and P3 1300 lb. The lengths of the segments of the bar are a 60 in., b 24 in., and c 36 in. (a) Assuming that the modulus of elasticity E 30 106 psi, calculate the change in length d of the bar. Does the bar elongate or shorten? (b) By what amount P should the load P3 be increased so that the bar does not change in length when the three loads are applied?
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