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m₁= 400 gr= 0,4 kg
t₁= 90°C
m₂= 300 gr= 0,3 kg
t₂=10°C
Dit=ta
Q₁=Q₂
m.c.Δt=m.c.Δt
m₁.(t₁-ta)=m₂.(ta-t₂)
0,4(90-ta)=0,3(ta-10)
36-0,4ta=0,3ta-3
0,7ta= 39
ta= 55,7°C