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L0 = 80 m
T0 = 28°C = 301 K
Takhir = 78°C = 351 K
Delta T = Takhir - T0 = 50 K
Alpha(koef muai panjang tembaga) = 17 × 10^-6/K
ditanya: delta L?
jawab:
delta L = L0 × Alpha × delta T = 80 m × 17 × 10-6/K × 50 K = 0.068 m