The stress-strain diagram for a material can be approximated by the two line segments. If a bar having a diameter of \(80 \mathrm{~mm}\) and a length of \(1.5 \mathrm{~m}\) is made from this material, determine the critical load provided the ends are pinned. Assume that the load acts through the axis of the bar. Use Engesser's equation.

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(MPa) 1100 200 0.001 -e (mm/mm) 0.007