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m₁c₁ΔT = m₂c₂ΔT
m₁c₁(tk-t1) = m₂c₂(t2-tk)
dane:
woda zimna(20*C)
m1= 60l= 60kg
c= 4200
t1= 20*C
woda gorąca:
m2= 30l= 30kg
c= 4200
tk = 40*C
m₁c₁(tk-t1) = m₂c₂(t2-tk)
c₁ = c₂ --> można skrócić
m₁(tk-t1) = m₂(t2-tk)
60 * (40 - 20) = 30 * (t2 - 40)
1200 = 30t2 - 1200
2400 = 30t2
t2 = 80*C