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anonymous

  • one year ago

which of the following circumstances leads to a loss of internal energy of a system? A. 600 J of heat is removed from a system that has 700 J of work done on it B. 600 J of heat is removed from a system that has 600 J of work done on it C. 100 J of heat is added to a systsem that has 600 J of work done of it D. 100 J of heat is added to a system that does 600 J of work

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  1. Michele_Laino
    • one year ago
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    here we have to apply this formula, namely the first principle of thermodynamics: \[Q = \Delta U + W\]

  2. anonymous
    • one year ago
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    ok! how do we do that?

  3. Michele_Laino
    • one year ago
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    we have to pick the case for which \Delta U < 0

  4. anonymous
    • one year ago
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    ok! not sure which that would be :(

  5. Michele_Laino
    • one year ago
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    for example, I consider the case A: there we have: Q= -600 and W= -700 so substituting, we get: \[\begin{gathered} - 600 = \Delta U - 700 \hfill \\ \Delta U = 100Joules \hfill \\ \end{gathered} \] so the answer can not be case A

  6. anonymous
    • one year ago
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    ohh i see so should it be choice C? :/

  7. Michele_Laino
    • one year ago
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    case B: Q=-600, W= -600, so \Delta U=0 so it is not case B

  8. anonymous
    • one year ago
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    yes:)

  9. Michele_Laino
    • one year ago
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    case C;: Q= +100, W= -600 so: \Delta U= 700 so it is not case C

  10. anonymous
    • one year ago
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    ohh oops :P so it is choice D?

  11. Michele_Laino
    • one year ago
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    yes! since case D: Q= 100, and W= 600, so: \Delta U = 100-600=-500 which is negative

  12. anonymous
    • one year ago
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    ooh yay!! thank you!!

  13. Michele_Laino
    • one year ago
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    thank you!! :)

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