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Question about work

  1. Jul 16, 2013 #1
    Hello, i have one question about work,
    Does work must be mechanical ?
    or we can change of some energy that is not mechanical (like internal or chemical)
    call work ?
     
  2. jcsd
  3. Jul 16, 2013 #2

    jtbell

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    Staff: Mentor

    Yes. If an energy transfer between two objects is caused by a difference in their temperatures, we call it heat, otherwise we call it work. Chemical work is an example of non-mechanical work.
     
  4. Jul 16, 2013 #3
    Ok thanks, then i have new question,
    If it says that is change of internal energy 1/3 of total work,
    in total work i should count sums of every energy changes ?
     
  5. Jul 17, 2013 #4

    jtbell

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    Staff: Mentor

    I'm sorry, I don't understand the question. Can you re-phrase it in other words, or quote the problem or text that you're reading?
     
  6. Jul 17, 2013 #5
    Ok, if it says that change of internal energy is part(for example 1/3) of TOTAL work executed over system(body). Does it mean that is TOTAL work indeed sums of every single work(mechanical work+internal energy change+...) ? If u understand me
     
    Last edited: Jul 17, 2013
  7. Jul 19, 2013 #6
    Can anyone answer ?
     
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