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ΔT = (100°C - 30°C) = 70°C
α = 1,1 × 10⁻⁷ /°C
β = 2α => 2 . (1,1 × 10⁻⁷) = 2,2 × 10⁻⁷
dit: A?
jwb: ΔA = A₀.β.ΔT
ΔA = 0,09.(2,2 × 10⁻⁵).70
ΔA = 1,386 × 10⁻⁴ m² = 0,0001386 m²
A = A₀ + ΔA
A = 9 + 0,000001368
A = 9,0001368 m²
Jadi, luas besi setelah memuai adalah 9,0001368 m² (A)
Semoga membantu :)