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A steel rod is stretched between two rigid walls and carries a tensile load of 5000 N at 20C. If the allowable stress is not

A steel rod is stretched between two rigid walls and carries a tensile load of 5000 N at 20°C. If the allowable stress is not to exceed 130 MPa at -20°C, what is the minimum diameter of the rod? Assume ? = 11.7 µm/(m·°C) and E = 200 GPa.

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