hej :) Do 3 kg wody o temperaturze 20*C zmieszano z 2kg piasku o temperaturze 100*C  oblicz temperature końcową mieszaniny :) 2 gim prosze o pomoc 

Cwo=800 J/kg C mo=2kg Tpo=100C Cwp=4200 kJ/kg C mp=3kg Tpp=20C Cwp mp (Tk-Tpp) = Cwo mo (Tpo-Tk) Cwp mp Tk - Cwp mp Tpp = Cwo mo Tpo - Cwo mo Tk Cwp mp Tk + Cwo mo Tk = Cwp mp Tpp + Cwo mo Tpo Tk (Cwp mp + Cwo mo) = Cwp mp Tpp + Cwo mo Tpo Tk=Cwp mp Tpp + Cwo mo Tpo / Cwp mp + Cwo mo Tk=4200 x 3 x 20 + 800 x 2 x 100 / 4200 x 3 + 800 x 2 Tk=252 000 + 160 000 / 12 600 + 1600 Tk=412 000  / 14 200 Tk≈29 C