An engine consists of a 100 kg cast iron block with a 20 kg aluminum head, 20 kg steel parts, 5 kg engine oil and 6 kg glycerine (antifreeze). Everything begins at 5°C and as the engine starts we want to know how hot it becomes if it absorbs a net of 7000 kJ before it reaches a steady uniform temperature.
Energy Eq.: U2 − U1= 1Q2 − 1W2
Process: The steel does not change volume and the change for the liquid is
minimal, so 1W2 ≅ 0.
So sum over the various parts of the left hand side in the energy equation
