Odpowiedzi

2010-03-31T17:05:18+02:00
X * [10°C - (-15°C)] * 4200J/kg*°C = 2,5kg * (40°C - 10°C) * 4200J/kg*°C
X * 25°C * 4200J/kg*°C = 2,5kg * 30°C * 4200J/kg*°C
105000x J/kg = 315000J /105000J/kg
x = 3 kg
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