Respostas

2014-07-23T16:28:45-03:00
A₀ = 4 m²
A = ?
β = 1,6 · 10⁻⁴ ⁰C⁻¹
θ₀ = 0 ⁰C
θ = 80 ⁰C

A = A₀ + A₀βΔθ = 4 + 4 · 1,6 · 10⁻⁴ · 80 = 4 + 0,512 = 4,512 m²

ΔA = 4,512 - 4,000 = 0,512 m²
2 4 2