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m1CwΔt1 = m2CoΔt2
Cw=4200
m1 = 10 kg
Δt1 = 30 - tk
m2=1kg
Co=130
Δt2 = 300 - tk
tk=?
10×4200×(tk-30) = 1×130×(300-tk)
42000tk -42000×30 = 130×300 - 130×tk
42130tk=39000+1260000
42130tk=1299000
tk=30,83 C temperatura końcowa
zatem woda ogrzeje się o 0,83 stopnia