How much heat will a brick weighing 2 kg give when cooling from 80 to 30 s.

Initial data: m (brick mass) = 2 kg; tн (brick temperature before cooling) = 80 ºС; tк (final brick temperature) = 30 ºС.

Reference data: C (specific heat of brick) = 880 J / (kg * K).

The amount of heat that the brick will give up when cooled is calculated by the formula: Q = C * m * (tн – tк).

Let’s calculate: Q = 880 * 2 * (80 – 30) = 880 * 2 * 50 = 88,000 J or 88 kJ.

Answer: When cooled, a brick will give off 88 kJ of heat.