anonymous
  • anonymous
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
Physics
chestercat
  • chestercat
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Michele_Laino
  • Michele_Laino
here we have to apply this formula, namely the first principle of thermodynamics: \[Q = \Delta U + W\]
anonymous
  • anonymous
ok! how do we do that?
Michele_Laino
  • Michele_Laino
we have to pick the case for which \Delta U < 0

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anonymous
  • anonymous
ok! not sure which that would be :(
Michele_Laino
  • Michele_Laino
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
anonymous
  • anonymous
ohh i see so should it be choice C? :/
Michele_Laino
  • Michele_Laino
case B: Q=-600, W= -600, so \Delta U=0 so it is not case B
anonymous
  • anonymous
yes:)
Michele_Laino
  • Michele_Laino
case C;: Q= +100, W= -600 so: \Delta U= 700 so it is not case C
anonymous
  • anonymous
ohh oops :P so it is choice D?
Michele_Laino
  • Michele_Laino
yes! since case D: Q= 100, and W= 600, so: \Delta U = 100-600=-500 which is negative
anonymous
  • anonymous
ooh yay!! thank you!!
Michele_Laino
  • Michele_Laino
thank you!! :)

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