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ΔT = 2 K
Q = 8,4 kJ = 8400 J
Cw = 4200[J/kg×⁰K]
Rozw.:
Q = m × Cw × ΔT
m = Q / Cw × ΔT = 8400 J / 4200[J/kg×⁰K]× 2⁰K = 1kg