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Homework Help: Energy into a rigid container>Find T2 and P2

  1. Feb 11, 2010 #1
    1. The problem statement, all variables and given/known data
    A Fan draws electricity at a rate of 1.5kW.
    The fan is in a well insulated rigid container of air with volume 60 m^3.
    Initial pressure and Initial Volume are: P1 = 1 atm, T1 = 27 degrees C.
    After 30 minutes, assume Ideal Gas behavior, determine the final Temp and final Pressure.


    2. Relevant equations

    ΔE = Q - W
    PV=nRT
    ΔU=mc(T2-T1)?


    3. The attempt at a solution

    I calculated the energy into the system to be 2700.8 kJ after 30 minutes. Since there is no ΔKE or ΔPE, ΔE = ΔU = 2700.8 kJ. Since it is well insulated, Q = 0. So W = -2700.8 kJ.

    I am having trouble linking the relationship between Energy and Temperature/Volume. I am not sure what other equations to use, so I am making no progress on this problem.
     
    Last edited: Feb 11, 2010
  2. jcsd
  3. Feb 11, 2010 #2
    Does anyone have some advice. I will take anything that points me in the right direction, lol.
     
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