1. The problem statement, all variables and given/known data http://img183.imageshack.us/img183/3628/jetlf0.jpg [Broken] http://img393.imageshack.us/img393/1759/jet2iu4.jpg [Broken] 2. Relevant equations 3. The attempt at a solution H = U + pV is the enthalpy, and hence the enthalpy per unit mass is h = U/m + pV/m which I have simplified to 7/2 RT/M I am then able to derive the expression in part b). Part c) though I'm very confused about, and then moving onto d) I'm pretty lost. I realise that in part say, to get change in T = 2Mq/7R, I can either set vf = vi = 0, or just simply vf = vi works too (where vf is final velocity and vi initial velocity). If someone could just point me in the right direction, that'd be awesome. For part d) dQ = 0 as its adiabatically compressed. Work done on the gas is p dV, and so dU = dQ + dW = pdV. p isn't constant, so I tried to rewrite as dU = nR dT (going for the long shots here hoping it will take me somewhere). Seeing as I seem to be going completely along the wrong lines, I'm not going to carry on.. Any help is appreciated, thanks.