How much heat is needed to heat from 10 to 40 with a brass weight of 100 grams?

The amount of heat for heating the considered brass weight can be calculated by the formula: Q = C * m * Δt = C * m * (t2 – t1), where C is the specific heat capacity of brass (400 J / (kg * K)); m is the mass of the considered brass weight (100 g = 0.1 kg); t2 – final temperature of weight heating (40 ºС); t1 – initial temperature of the weight (10 ºС).

Let’s calculate: Q = 400 * 0.1 * (40 – 10) = 400 * 0.1 * 30 = 1200 J (1.2 kJ).

Answer: 1.2 kJ of heat was spent on heating the brass weight.