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A₀ = 10 x 5 = 50 cm²
α = 1,8 x 10⁻⁵/°C
ΔT = 70 - 20 = 50 °C
ditanya
pertambahan luas keping tembaga (ΔA)
jawab :
ΔA = A₀ β ΔT
ΔA = A₀ 2α ΔT
ΔA = 50(2(1,8 x 10⁻⁵))(50)
ΔA = 0,09 cm²