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m = 2 kg
Q = 168 kJ = 168000 J
c_w = 4200J/kg*K
szukane:
delta T = ?
Q = c_w * delta T * m
delta T = Q/(c_w * m)
delta T = (168000 J)/(4200J /kg*K * 2 kg) = (168000 J)/(8400 J/K) = (1680 J)/(84 J/K) = 20 K = 20 C
Zmiana temperatury w K jest równa zmianie w C