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v = 0,5 liter
t1 = 30'c
t2 = 80'c
c = 4200J/kg'c
Ditanya: Q....?
1 liter setara dgn 1 kg
0,5 liter = 0,5 kg
Q = m.c.(t2 - t1)
Q = 0,5 . 4200 . (80-30)
Q = 105.000 J
Q = 105 kJ