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m = 1 kg ΔT = ? Q = mcwΔT
cw = 4200 J/kg C
Q = 84 kJ = 84000 J
Q = mcwΔT
ΔT = Q/mcw
ΔT = 84000 J / kg· 4200 J/kg °C
ΔT = 20 °C
woda ogrzeje się o 20 °C