1. Calculate the quantity of heat energy which must be transferred to 2.25 kg of brass toΒ
raise its temperature from 20 β to 240 β if the specific heat of brass is 394 J.kg-K.
2. Find the change in temperature produced by 10 kJ of heat energy added to 500 gΒ
copper. Specific heat of copper 0.39 kJ/kg-K.
3. Explain why, for a gas, the specific heat at constant volume has a different valueΒ
from the specific heat at constant pressure.
An ideal gas is contained in a cylinder fitted with a piston. Initially the temperature of theΒ
gas is 15β. If the mass of the gas is 0.035 kg, calculate the quantity of heat energyΒ
required to raise the temperature of the gas to 150 β when:
(a) The piston is fixed;
(b) The piston moves and the pressure is constant.
For the gas, ππ£ = 676 J/kg-K and ππ = 925 J/kg-K.