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Lt = Lo + ΔL --> ΔL = Lo.α.ΔT
= 80.0,000017. (78-28)
= 0,068 m ----> pertambahan panjangnya
7. pd grafik :
Lo = 100 cm
Lt = 100,18 --> ΔT = 90
ΔL = Lt - Lo
= 100,18-100
= 0,18 cm
ΔL = Lo.α.ΔT --> α = ΔL / Lo.ΔT
= 0,18 / 100. 90
= 0,00002 /C