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Q = m.c.(suhawal-suhakhir)
suhakhir-suhuawal = Q/m.c
× - 25= 42000/0.2.4200
× - 25= 42000/840
× - 25 = 50
× = 50+25
× = 75°c
c=4200 j/kg°c
t1= 25°c
Q=42000
ditanya=suhu akhir....???
jawab= At= Q / m x c
=42000 / 0,2 x 4200
=2
At = t2 – t1
2 = t2 – 25
2+25 =t2
27 =t2
jadi suhu akhir tetsebut adalah 27