1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Piston Temperature Problem

  1. Aug 7, 2011 #1
    1A Jaguar XK8 convertible has an eight-cylinder engine. At the beginning of its compression stroke, one of the cylinders contains 498 cm^3 of air at atmospheric pressure (1.01 x 10 ^5 Pa) and a temperature of 27.0 C. At the end of the stroke, the air has been compressed to a volume of 46.3 cm^3 and the gauge pressure has increased to 2.8 x 10 ^6 Pa . What is the final temperature?


    pv=nrt

    T0=300K
    P0=1.01 x 10 ^5 Pa
    V0=498 cm^3

    Tf=?
    Pf=2.8 x 10 ^6 Pa .
    Vf=46.3 cm^3




    So I set a a proportionality and I get Tf=Pf * Vf* T0/( P0 * V0)

    plug in the values and get about 773 K or 500 celsius but my answer is wrong.
     
    Last edited: Aug 7, 2011
  2. jcsd
  3. Aug 7, 2011 #2

    rock.freak667

    User Avatar
    Homework Helper

    gauge pressure is the actual pressure - atmospheric pressure.

    i.e. gauge pressure = absolute pressure - atmospheric pressure

    you need to get Pf in absolute pressure so add atmospheric to it.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook