[latex]T_{1} = 20^{o}C[/latex] [latex]T_{2} = 0^{o}C[/latex] [latex]T_{x} = 10^{o}C[/latex] [latex]Cw_{1} = 4200 J/kg^{o}C[/latex] [latex]Cw_{2} = 2100 J/kg^{o}C[/latex] [latex]m_{1} = 20 kg[/latex] [latex]m_{2} = ?[/latex] [latex]Q_{pobrane} = Q_{oddane}[/latex] [latex]m_{1} Cw_{1} [/latex]ΔT [latex]= m_{2} Cw_{2}[/latex] ΔT [latex]m_{1} Cw_{1} (T_{1}-T_{x}) = m_{2} Cw_{2} (Tx-T_{2}) : Cw_{2}T_{x} - Cw_{2}T_{2}[/latex] [latex](m_{1} Cw_{1} T_{1} - m_{1} Cw_{1} T_{x}) : Cw_{2}T_{x} - Cw_{2}T_{2} = m_{2}[/latex] [latex](20kg cdot 4200 J/kg^{o}C cdot 20^{o}C - 20kg cdot 4200 J/kg^{o}C cdot 10^{o}C) : 2100 J/kg^{o}C cdot 10^{o}C - 2100 J/kg^{o}C cdot 0^{o}C = m_{2}[/latex] [latex]840000 J : 21000 J/kg = m_{2}[/latex] [latex]40kg = m_{2}[/latex]
