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 length of \(1.5 \mathrm{~m}\) is made from this material, determine the critical load provided one end is pinned and the other is fixed. Assume that the load acts through the axis of the bar. Use Engesser's equation.

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