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α = 0,00002 /°C
lо = 40 cm
ΔT = 70 - 20 = 50°C
Dit :
Lt....?
Dij :
Lt = Lo x ( 1 + α x ΔT )
Lt = 40 x ( 1 + 0,00002 x 50 )
Lt = 40 x ( 1 + 0,001 )
Lt = 40 x 1,001
Lt = 40,04 cm
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