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A steel rod with a cross-sectional area ...

A steel rod with a cross-sectional area of `150 mm^(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 `alpha=11.7mu m//m^(@)C` and `Y=200GN//m^(2)`)

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