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How to determine whether a system is closed or not?

  1. Nov 25, 2013 #1
    physicgtg.png

    I know the definition of an open/closed system but I am still confused:

    1) Why isn't C a closed system?

    2) I know that a simple system's state is defined by just 2 properties (when the system is in equilibrium) but how do we eliminate the wrong answers and determine the correct answer in this question?

    3) The independent variable = the thing you change (as far as I know) but that doesn't lead me any closer to the correct answer..

    Cheers
     
  2. jcsd
  3. Nov 25, 2013 #2
    C isn't a closed system because exhaust gases are entering and leaving the car exhaust (piping).
     
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