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A vertical steel bar of uniform section carries a load P = 315 kN at its long end. The length of the bar is 240 m and its unit weight is 76.7 kN/m³. Determine the cross-sectional area of the bar and its elongation. Also, determine the limit length for which a prismatic section cannot be used. The permissible stress in the bar is 70 MPa. Consider E = 80 GPa.
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