Answer:
To calculate the heat given out by the piece of brass, we can use the formula:
Q = mcΔT
Where:
Q = heat given out
m = mass of brass = 150g = 0.15kg
c = specific heat capacity of brass = 560 J/kgK
ΔT = change in temperature = (35°C - 90°C) = -55°C (note that the temperature change is negative because the brass is cooling)
Substituting the values, we get:
Q = (0.15 kg) x (560 J/kgK) x (-55°C)
Q = -4,620 J
Therefore, the piece of brass gives out 4,620 J of heat when it cools from 90°C to 35°C.