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T₁ = 100 C = 373 K
T₂ = 20 C = 293 K
cw = 4200 J / kg*K
delta T = 373 K - 293 K = 80 K
Q = m * delta T * cw
Q = 0,2 kg * 80 K * 4200 J / kg*K = 67200 J
Odp. Kubek odda 67200 J ciepła.