A system does 72 Joules of external work, and its thermal energy increases by 54 Joules. According to the first law of thermodynamics, which of the following expressions could be used to calculate the amount of heat added to the system?

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A system does 72 Joules of external work, and its thermal energy increases by 54 Joules. According to the first law of thermodynamics, which of the following expressions could be used to calculate the amount of heat added to the system?






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