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
Stacey Warren - Expert brainly.com
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here we have to apply this formula, namely the first principle of thermodynamics:
\[Q = \Delta U + W\]
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ok! not sure which that would be :(
for example, I consider the case A:
there we have:
Q= -600 and W= -700 so substituting, we get:
- 600 = \Delta U - 700 \hfill \\
\Delta U = 100Joules \hfill \\
so the answer can not be case A
ohh i see so should it be choice C? :/
Q=-600, W= -600, so \Delta U=0
so it is not case B
Q= +100, W= -600
so: \Delta U= 700
so it is not case C
ohh oops :P so it is choice D?
yes! since case D:
Q= 100, and W= 600, so:
\Delta U = 100-600=-500 which is negative