A steel wire has a length of 2 m at 20°C. Its length becomes 2.01 m at 120°C.
Calculate coefficient of linear expansion α of the material of wire
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Answer:
L = L0 + L0 a T where
L0 = initial length, L = final length
a = coefficient of linear expansion, T = change in temperature
(L / L0 - 1) / T = a
(.01 / 2) / 100 = a = 5 * 10E-5 / deg C
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