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m₁= 1kg
t₁= 80°C
m₂= 4 kg
t₂= 30°C
Dit= ta
Jwb=
Q₁=Q₂
m₁.c.Δt=m₂.c.Δt
m₁.(t₁-ta)=m₂.(ta-t₂)
1.(80-ta)= 4(ta-30)
80-ta= 4ta- 120
5 ta= 200
ta= 40°C