A steel rod with a cross-sectional area of 150mm^2 is stretched between two fixed points. The tensile load at 20°C is  5000N. (a) What will be the stress at -20°C? (b) At what temperature will the stress be zero? Assume  (E=200x10^9N/m^2, α=11.7 um/cm°C)

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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A steel rod with a cross-sectional area of 150mm^2 is stretched between two fixed points. The tensile load at 20°C is  5000N. (a) What will be the stress at -20°C? (b) At what temperature will the stress be zero? Assume  (E=200x10^9N/m^2, α=11.7 um/cm°C) 

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