Initial data: m (mass of cooled iron) = 500 g = 0.5 kg; Q (thermal energy released during cooling of iron) = 3 kJ = 3 * 10 ^ 3 J.
Reference data: C (specific heat capacity of iron) = 460 J / (kg * K).
The change in the temperature of iron during cooling can be determined from the formula: Q = C * m * Δt, whence Δt = Q / (C * m).
Let’s calculate: Δt = 3 * 10 ^ 3 / (460 * 0.5) = 13 ºС.
Answer: The temperature of iron will decrease by 13 ºС.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.