What amount of heat is released when 3 kg of cast iron cools down at 50 ° C?

Task data: m (mass of cooled cast iron) = 3 kg; Δt (change in cast iron temperature) = 50 ºС.

Reference values: Сч (specific heat capacity of cast iron) = 540 J / (kg * K).

The amount of heat released during cooling of 3 kg of cast iron is determined by the formula: Q = Сч * m * Δt.

Let’s perform the calculation: Q = 540 * 3 * 50 = 81 * 10 ^ 3 J (81 kJ).

Answer: When 3 kg of cast iron cools down, 81 kJ of heat will be released.