Odpowiedź :
[tex]c = 4200\frac{J}{kg\cdot ^{o}C}} \ - \ cieplo \ wlasciwe \ wody[/tex]
3.
[tex]dane:\\m = 10 \ kg\\T_1 = 60^{o}C\\T_2 = 40^{o}C\\\Delta T = T_1 - T_2 = 60^{o}C - 40^{o}C = 20^{o}C\\szukane:\\Q = ?\\\\Rozwiazanie\\\\Q = c\cdot m\cdot \Delta t}\\\\Q = 4200\frac{J}{kg\cdot ^{o}C} \cdot 10 \ kg \cdot20^{o}C \\\\Q = 840 \ 000 \ J = 840 \ kJ[/tex]
4.
[tex]dane:\\Q = 1 \ 260 \ J\\m = 25 \ dag = 0,25 \ kg\\\Delta T = 6^{o}C\\szukane:\\c = ?\\\\Rozwiazanie\\\\c = \frac{Q}{m\cdot \Delta T}\\\\c = \frac{1260 \ J}{0,25 \ kg\cdot6^{o}C}=\frac{1260 \ J}{1,5 \ kg\cdot^{o}C} = 840\frac{J}{kg\cdot^{o}C}[/tex]
6.
[tex]dane:\\Q = 1 \ 260 \ kJ = 1 \ 260 \ 000 \ J\\T_1 = 60^{o}C\\T_2 = 30^{o}C\\\Delta T = 60^{o}C - 30^{o}C = 30^{o}C\\szukane:\\m = ?\\\\Rozwiazanie\\\\Q = c\cdot m\cdot \Delta T \ \ /:(c\cdot \Delta T)\\\\m = \frac{Q}{c\cdot \Delta T}\\\\m = \frac{1260000 \ J}{4200\frac{J}{kg\cdot ^{o}C}\cdot30^{o}C} = 10 \ kg[/tex]
7.
[tex]dane:\\Q = 1 \ 260 \ kJ = 1 \ 260 \ 000 \ J\\m = 10 \ kg\\szukane:\\\Delta T = ?\\\\Rozwiazanie\\\\Q = c\cdot m\cdot \Delta T \ \ /:(c\cdot m)\\\\\Delta T = \frac{Q}{c\cdot m}\\\\\Delta T = \frac{1260000 \ J}{4200\frac{J}{kg\cdot ^{o}C}\cdot10 \ kg} = 30^{o}C[/tex]
8.
[tex]dane:\\m_1 = m_2 = m = 4 \ kg\\T_1 = 10^{o}C\\T_2 = 40^{o}C\\szukane:\\T_{k} = ?\\\\Rozwiazanie\\\\Q_{pobrane} = Q_{oddane}\\\\m_1c(T_{k}-T_1) = m_2c(T_2-T_{k})\\\\m_1 = m_2 = m\\\\mc(T_{k}-T_1) = mc(T_2 - T_{k}) \ \ /:mc\\\\T_{k}-T_1 = T_2-T_{k}\\\\T_{k}+T_{k} = T_1+T_2}\\\\2T_{k} = T_1 + T_2 \ \ /:2\\\\T_{k} = \frac{T_1+T_2}{2}\\\\T_{k} = \frac{10^{o}C + 40^{o}C}{2} = 25^{o}C\\\\Odp. \ C.[/tex]