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m=250g=0.25dag
t= 100C-20C=80C
Szukane:
Ew= ?
Cw=4200 J/kg * C
Ew= Cw * t * m= 4200 J/kg *C * 80 C *0. 25 kg = 84000 J
Odp Woda stygnąc odda 84000 J