Determine how much heat is needed to heat a brick weighing 2 kg

Determine how much heat is needed to heat a brick weighing 2 kg from 20 degrees to 120 degrees. the specific heat capacity of the brick is 750 J / kg.

Given:

m = 2 kilograms is the mass of the brick;

T1 = 20 degrees Celsius – the initial temperature of the brick;

T2 = 120 degrees Celsius – the temperature to which the brick must be heated;

c = 750 J / (kg * C) is the specific heat capacity of the brick.

It is required to determine Q (Joule) – the amount of heat for heating the brick.

Q = c * m * dT = c * m * (T2 – T1) = 2 * 750 * (120 – 100) = 2 * 750 * 100 = 150,000 Joules = 150 kJ.

Answer: to heat the brick, you need an amount of heat equal to 150 kJ.