Air bermasa 60 gram bersuhu 90 drajat Celcius dicampur dengan air bermasa 150 gram sehingga suhu akhir campuran 40 drajat Celcius. Suhu awal air yang bermasa 150 gram adalah......
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m₁.c₁.(T₁-T)=m₂.c₂.(T-T₂)
60.1.(90-40)=150.1(40-T₂)
2.50=5(40-T₂)
20=40-T₂
T₂=20°C