Question

An engine consists of a 200 lbm cast iron block with a 40 lbm aluminum head, 40 lbm steel parts, 10 lbm engine oil and 12 lbm glycerine (antifreeze). Everything begins at 40 F and as the engine starts, it absorbs a net of 7000 Btu before it reaches a steady uniform temperature. We want to know how hot it becomes

Answer 1

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 equatio