Recent content by JesseCoffey

  1. J

    Schools Grad School Advice -- Physics MS or PhD?

    Hello, First this may be pretty long and i apologize and appreciate any guidance. I tend to give way to much information, so the straight to the point questions: How important is it to take the non-required but recommended for graduate students courses as an undergrad? Namely Modern Optics...
  2. J

    Efficiency of an Ideal-Gas Cycle: How is it Derived?

    thanks, that makes me feel better. can you explain to me exactly why we take the absolute value? Just so i can understand it and apply it to future problems. thanks again. I think I understand. Work is actually equal to the sum of the heat. By me stating Qin - Qout I am taking the...
  3. J

    Efficiency of an Ideal-Gas Cycle: How is it Derived?

    Ok, so I tried 3 different ways and started to post my questions on here, and while posting one of my questions, I think I answered it myself. I stated that I wasnt sure how to relate the change in T to p and V, but I forgot about the ideal gas equation. So I just solved for Q's like before...
  4. J

    Efficiency of an Ideal-Gas Cycle: How is it Derived?

    Using Qh for heat absorbed and Ql for heat lost I was using the equation as: n = w/Qh = (Qh +Ql)/Qh = 1 + Ql/Qh. Ql being from (i) and Qh being from (ii). Q = 0 from (iii). Qh = ∫Cv dT Ql = ∫Cp dt + ∫pdV For adiabatic ΔQ = 0 so ΔU = W. Since, you are ending where you started ΔU for the...
  5. J

    Efficiency of an Ideal-Gas Cycle: How is it Derived?

    Homework Statement A possible ideal-gas cycle operates as follows: (i) from an initial state (p1,V1) the gas is cooled at constant pressure to (p1,V2); (ii) the gas is heated at constant volume to (p2,V2); (iii) the gas expands adiabatically back to (p1,V1). Assuming constant heat...
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