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kalor jenis air = 4200 J / Kg °C
massa = 100 g = 0,1 kg
ΔT = perubahan suhu = 40 - 10 = 30 °C
Q = m x c air x ΔT
= 0,1 x 4200 x (40-10)
= 420 x 30
= 12600 J
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