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l₀ = 50 cm
l = 50,068 cm
α = 0,000017/°C
l = l₀ (1 + α Δt)
50,068 = 50 (1 + 0,000017 . Δt)
50,068 = 50 + 0,00085 Δt
0,068 = 0,00085 Δt
Δt = 0,068/0,00085
Δt = 80 °C
7.V = 10 x 2 x 2 cm³ = 40 cm³
t₀ = 0 °C
t = 100 °C => Δt = t - t₀ = 100 °C
α = 0,000012/°C => γ = 3α = 0,000036/°C
v = v₀ (1 + γ Δt)
v = 40 (1 + 0,000036 . 100)
v = 40 (1 + 0,0036)
v = 40 x 1,0036
v = 40,144 cm