How do you find internal energy of U=Q+W?

AI Thread Summary
To find the internal energy using the equation U=Q+W, it's essential to focus on the change in internal energy as a process quantity. In a thermally isolated system or during rapid processes, Q can be considered zero. For slower processes at a known temperature, internal energy can be calculated based on temperature and the type of gas involved. The work done in the system is provided as Wac=21000J, Wbc=0, and Wab=91000J. Understanding these principles is crucial for accurately determining internal energy in various thermodynamic scenarios.
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i figured out that
Wac=21000J
Wbc=0
Wab=91000J

how do you find internal energy of U=Q+W?
 

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It is the CHANGE of Internal Energy that is a process quantity,
related to other process quantities like Work and Heat.
If this is a "thermally isolated system" or the steps happen "quickly",
then you treat Q = 0 . If it happens "slowly" or at known Temperature,
then you know T and should calculate I.E. from T (depending on the kind of gas)
 

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