Which of the following statements is true?
A. In an isobaric system, no flow work can be added or removed, because flow work is equal to PAv and in an isobaric system P=0.
B. In a closed system, no flow work is added or removed, because no material is entering or leaving the system.
C. In applying the equation W_EC= -??PdV, the P always stands for the pressure inside the system.
D. In applying the equation W_EC= -??PdV, the P always stands for the pressure outside the system.
E. None of the above are true.
A. Incorrect. The word isobaric means that pressure is constant, not that pressure is 0.
B. Correct. A closed system can have shaft work or expansion work added or removed, but not flow work.
C. Incorrect. The P stands for the pressure opposing the motion. If the system is expanding, the pressure opposing the motion is the pressure outside the system.
D. Incorrect. The P stands for the pressure opposing the motion. If the system is being compressed, the pressure opposing the motion is the pressure inside the system.
E. Incorrect. Check again. One of the statements is true.
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