The above square hollow bar is subjected to an axial force P. The bar is made of a metal alloy having the showing stress-strain diagram. [10 Pts] the modulus of elasticity, E, b. [10 Pts] the axial stiffness, K, c. [10 Pts] the modulus of resilience, ur, and c. [10 Pts] the modulus of resilience, ur, and

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