Ile energii podczas oziębienia o 40°C odda woda o masie 500 g?

[latex]Dane:\ Delta T = 40 ^oC\ m = 500 g = 0,5 kg\ c_w = 4200 frac{J}{kg*^oC}\ \ Q_{oddane} = c_wmDelta T = 4200*0,5*40 = 84000 J = 84 kJ[/latex]