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L0 = 20 cm
α = 10⁻⁴/C
T0 = 30 C
T = 80 C
DIT : ΔL ?
DIJAWAB :
ΔL = α x L0 x ΔT
= 10⁻⁴ x 20 x (80-30)
= 10⁻⁴ x 20 x 50
= 10⁻⁴ x 1000
= 0,1 cm