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= t0 : 28 drjt
= t1 : 78 drjt
= L0 : 80 m
Ditanya = ΔL ?
Jawab = ΔL = L0 x α x Δt
= 80 m x 0,000017/° C x 50 drjt C
= 0,068m
jadi, pertambahan panjangnya 0, 068m