1. The problem statement, all variables and given/known data Is this equation correct for the 1st Law of Thermodynamics for an Open System (Control Volume): Q - W + min(h + 1/2(c^2) + gz)in - mout(h + 1/2(c^2) + gz)out = Δ(U 1/2(c^2) + gz). 2. Relevant equations None really. 3. The attempt at a solution This isn't so much an assignment question as a possible discrepancy in the notes. I would've thought this Δ(U 1/2(c^2) + gz) should be Δ(U 1/2(mc^2) + mgz), am I correct in thinking that or not? Thanks.