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m₁= 150 kg
t₁= 90°C
t₂= 10°C
ta= 40°C
Dit= m₂
Jwb=
Q₁=Q₂
m₁.c.Δt=m₂.c.Δt
m₁.(t₁-ta)=m₂.(ta-t₂)
150.(90-40)=m₂.(40-10)
150.50=m₂.30
7500= m₂.30
m₂=250 kg