Which of the following is the sign convention that results from the above definitions [Solved]

answer is B

Finally I cant find what you are asking

Finally I cant find what you are asking

However ,
: work done on the system by the outside world is positive .
heat added to the system by the outside world is also positive
: thermal energy change of the system. is also positive .

W Q = Eth. is the first law of thermo dynamics .
===========================
A) W is positive when the system is compressed, and Q is positive when heat is added to the system.

answer is B

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