In the First Law of Thermodynamics $\Delta$ U = Q + W),the Variables Q and W Stand

question 68

Multiple Choice

In the first law of thermodynamics ( $\Delta$ U = Q + W) ,the variables Q and W stand for

• A) the heat flow out of the system and the work done on the system.
• B) the heat flow out of the system and the work done by the system.
• C) the heat flow into the system and the work done by the system.
• D) the heat flow into the system and the work done on the system.