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= 30m (1+0,000011/°C.(40'C-10'C))
= 30m (1+0,000011/°C.30'C)
= 30m (1+0,00033)
= 30m + 0,0099m
L2 = 30,0099m
ΔL = L2 - L1
= 30,0099m - 30m
ΔL = 0,0099m
Jadi , jarak antara 2 rel adalah 0,0099 x 2 = 0,0198m
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