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m1*Cw*Δt₁ = m2*Cw*Δt₂
Cw się skraca ciepło właściwe wody
m1 = 0,3 kg m2 = 0,2 kg
Δt₁ = 90 - tk
Δt₂ = tk - 20
0,3(90-tk) = 0,2(tk-20)
0,3*90 - 0,3tk = 0,2tk - 0,2*20
27-0,3tk = 0,2tk - 4
-0,5tk=-31
tk=62 C