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Homework Help: Air is added in to a flat tire

  1. Nov 8, 2007 #1
    [bpump add air in to the flat tire in the gas station. The compressed air is at 180 psia and 60F(+460). the tire is initially at vaccum, therefore p0=0 psia. Air is added in to the tire until it reaches Pf =32.9 psig which is (23.9+14.7=47.6 psia), then stopped . this process is adiobatic which mean Q=0. find the final tempreture Tf in R degree. then find the entropy change and internal changed for a rigid tire which has volume of 0.6 cuft. what is the system (control mass or control volume . In this cas Air is an ideal gas with cp=7/2 R
  2. jcsd
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