Jawabanmu

2014-03-08T18:13:19+07:00
Q = m c ΔT
45000 J = 0,5 kg * 900 j/kg (x-30)
45000 J = 450 j/kg (x-30)
45000 J/450 j/kg = (x-30)
100 = x - 30
100 + 30 = x
130 derajat C = x