How much does the internal energy of a brass piece with a mass of 100 kg

How much does the internal energy of a brass piece with a mass of 100 kg decrease if it is cooled by 20 “C? Specific heat capacity of brass 380J / (kg *” C)

Task data: m (mass of the taken brass part) = 100 kg; Δt (change in temperature of the brass part during cooling) = 20 ºС.

Reference values: according to the condition Cl (specific heat of brass) = 380 J / (kg * K).

The decrease in the internal energy of the taken brass part is calculated by the formula: ΔQ = Сl * m * Δt.

Let’s make a calculation: ΔQ = 380 * 100 * 20 = 760 * 10 ^ 3 J (760 kJ).

Answer: The internal energy of the taken brass part will decrease by 760 kJ.