1. The problem statement, all variables and given/known data Argo, in its gas form, is insterted into a spinner, with a rythm of 80.0 kg/min = 1.33 kg/s, temperature 800 C (= 1073.15 K), and pressure 1.50 MPa. It's decompressed adiabatically, and "escapes" the spinner with pressure 300 kPa. a) Temperature when it "escapes" ? b) Maximum Power of the spinner? c) Hypothesize that the spinner works as a machine that completes a "closedcircle" when a gas is inserted. What's the maximum efficiency of this machine? 2. Relevant equations p = m/V PVγ = constant TVγ-1 = constant PV = nRT ec = 1 - Tc/Th γ = 1.67 (from the book) p = 1784 kg/m3 3. The attempt at a solution a) That one I've solved: >Gas is inserted with a rythm of 1.33 kg/s. So, mi = 1.33 kg. >p = m/V = 1784 kg/m3 >Therefore, Vi = 7.45 * 10-4 m3 >PiViγ = PfVfγ <=> ... <=> Vf = 1.95 * 10-3 m3 >TiViγ-1 = TfVfγ-1 <=> ... <=> Tf = 563 K The book's answer is 564 K, but to it flactuates between using Tk = Tc + 273.15 and Tk = Tc + 273,and it plays fast and loose with the Significant Digits. Not to mention that with Tf = 564 K, (c)'sresultis still not in line with the book's. b) That's where I'm stuck. I know that Power is given through P = W/Δt, but I've got no clue one how to find the Work. I figured I'd do this: W = ∫ViVfPdV, with P = PiViγ/Vγ, but I got a wholly different result. c) The machine will have a maximum efficiency if it works like a Carnotone, so: ec = 1 - Tc/Th = 1 - 563 K/1073.15 K = 0.475 = 47.5 % Any help is appreciated!