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ΔL = 15 9 10^-5 20
ΔL = 2700 10^-5
ΔL = 0,027 m
ΔL = 2,7 cm
α = 0,00009/°C
ΔΤ = 54-34 = 20°C
Dit : ΔL ?
= Lo x α x ΔΤ
= 15 x 0,00009 x 20
= 0,027 m
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