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m₁ = 2,5 kg
t₁ = 70°
t₂ = 30°
ta= 40°
c = 4200 J/kg°C
Dit = m₂
Jwb=
Q₁ = Q₂
m₁.c.Δt = m₂.c.Δt
m₁.c.(t₁-ta) = m₂.c.(ta-t₂)
2,5.4200.(70-40) = m₂.4200.(40-30)
2,5.4200.30 = m₂.4200.10
315000 = m₂. 42000
m₂ = 7,5 kg