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L1 = 80 cm
T1 = 30°C
T2 = 75°C
dit: L2?
jawab:
ΔT = T2 - T1
= 75-30
= 45°C
ΔL = α x L1 x ΔT
= 0,00017/°C 80 cm 45°C
= 0,612 cm
ΔL = L2-L1
0,612 = L2 - L1
L2 = 80 + 0,612
= 80,612 cm