Sign conventions for heat and work. Heat, q , gained by a system and work, w , d

Question

Sign conventions for heat and work. Heat, q, gained by a system and work, w, done on a system are both positive quantities, corresponding to "deposits" of internal energy into the system. Conversely, heat transferred from the system to the surroundings and work done by the system on the surroundings are both "withdrawals" of internal energy from the system.

1. Suppose a system receives a "deposit" of work from the surroundings and loses a "withdrawal" of heat to the surroundings. Can we determine the sign of ? E for this process?

A. yes, it is positive

B. yes, it is negative

C. no, we need to know the magnitudes of q and w

Explanation / Answer

C. no, we need to know the magnitudes of q and w

because DE = q + W

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