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T0 = 20 C
T = 70 C
L0 = 40 cm
α = 0,000011/C
dit : L ?
dijawab :
L = L0 x (1+αxΔT)
= 40 x (1 + 0,000011 x (70-20))
= 40 x (1 + 0,000011 x 50)
= 40 x (1 + 0,00055)
= 40,022 cm