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m₁ = 1 kg
cw = 4200 J/kg * C
m₂ = 0,65 kg
cw₂= 380 J/kg * C
t₁ = 20 C
t₂ = 100 C
Δt = 100 C - 20 C = 80 C
szukane: Q
Q = Q₁ + Q₂
Q = m₁ * cw₁*Δt + m₂ * cw₂*Δt
Q = Δt ( m₁ * cw₁ + m₂*cw₂)
Q = 80 C ( 1 kg *4200 J/kg * C + 0,65 kg *380 J/kg * C )
Q = 80 C * 4447 J/C
Q = 355760 J = 355,76 kJ