Question: Consider an infinitesimally small fluid element moving along with the flow. Apply the first law of thermodynamics to this model. Which of these statements is correct?
Options
A : The rate of change of the total energy is equal to the rate of heat addition and work extraction
B : The rate of work extraction is equal to the rate of heat addition and the rate of change of the total energy
C : The rate of heat addition is equal to the rate of work extraction and the rate of change of the total energy
D : The rate of change of the total energy is equal to the rate of work extraction
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