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L0 = 100 cm
T0 = 25 C
T = 50 C
α = 0,000019
dit : L ?
maka :
Δl = α x L0 x ΔT
= 0,000019 X 100 X (50-25)
= 0,000019 x 2.500
= 0,0475
L = L0 + ΔL
= 100 + 0,0475
= 100,0475 cm
Lt = Lo + Lo x a x delta t
Lt = 100 + 100x0,000019x25
Lt = 100 + 0,0475
Lt = 100,0475 cm