Problem: Write an equation that expresses the first law of thermodynamics in terms of heat and work. Under what conditions will the quantities q and w be negative numbers?

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We are being asked to write an expression for internal energy in terms of heat and work, and identify the conditions where q and w will be negative

The internal energy (ΔE or ΔU) of a system can be calculated from the heat and work of the system. The relationship between internal energy, heat, and work is shown in the following equation

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Write an equation that expresses the first law of thermodynamics in terms of heat and work. 

Under what conditions will the quantities q and w be negative numbers?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the First Law of Thermodynamics concept. You can view video lessons to learn First Law of Thermodynamics. Or if you need more First Law of Thermodynamics practice, you can also practice First Law of Thermodynamics practice problems.