Quiz_4_Solution - J F;~t LoLJ;5 V~~lc.t~~ ~ La n S era 0...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Name: Sdu.tO'\ ME 302 Quiz 4 1) (10 pts) An inventor has designed a compressed air engine for an automobile. A tank of compressed air is used to turn an air-powered motor, which provides power to the wheels of the car. The same inventor has also made an air compressor using the same technology as the air motor. The inventor then proposes attaching the air compressor to the output shaft of a compressed air motor so that the tank of compressed air will remain continually pressurized while providing power to the wheels of the car. What do you think about the combined device shown below? Would you invest your money in it? If it is a perpetual motion machine, what type is it (PMM1, PMM2, or PMM3)? You MUST justify your answers and show a control volume of the overall system to receive full credit. ~- -- , - Tank \ . Wwheel - / Ambient Air at b::,~t rn 0,,, -=. ,v1~t (Gir motor CO/'. onl, expcl\ J 1'1:> otN\'O~fheri(. pre~u(e.)
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: J F;~t LoLJ ;5 V~~lc.t~~ ~ La n S era 0 t;OI"'\ f.. ener~ j--, No) r vo/(J yYJt /r/l)e$t ill ,ot I ond IS PMM1.' 2) (3 pts) True [email protected]: p 8 r Q = ss 3) (3 pts) True [email protected]: For an irreversible heat engine, ni« = 1 -~~ = ~ T for ~('~: lot e. of) IY 4) (4 pts) Heat transferred at a finite temperature difference is always irreversible. Physically explain the one nontrivial situation (Q "* 0) where heat transfer is totally reversible. 1/ 6T ;-5 ;n(;f\I'~~;1Y'Io1 (lit, fjT ~ A-T)-ry Go/:;. at S:y-n fur ked" '1'(",,< k~ c\e(:v"6 :,,<10';' S~ -:: Q (1_ 1..\ ~~~,,:::O if. Q~o "0(' if d- . . J ':t: O or Tt;-T£.-:t. .dl fl. . TH) I~ IN . 5) (5 pts) In terms of cyclic integrals, explain why (8 Q ) is a property, but PdV is not. r rev {or On Y prop e,. ..ry...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern