4. (a) Illustrate the stress-strain curve in elasticity. (b)A Steel rod with Young’s modulus Y=200 GPa has a circular cross section and is 10 m long. Determine the minimum diameter if the rod must hold a 30 kN tensile force without deforming more than 5 mm. Assume the steel stays in the elastic region. Note, 1 GPa = 10^9 Pa.
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