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t₁= 28°C
t₂= 78°C
Δt= t₂-t₁
Δt= 50°C
l₀= 80 m
Dit = Δl
Jwb=
Δl= l₀.α.Δt
Δl=80.α.50
Δl= 400α
untuk α kamu cari ditabel 7,1 seperti yang ada pada soal