1.

Let \(\hat{u}\) be the specific internal energy of a system moving along with the flow with a velocity \(\vec{V}\). What is the time rate of change of the total energy of the system per unit mass?

A. \(\hat{u}+\frac{1}{2}\vec{V}.\vec{V}\)
B. \(\frac{D}{Dt}(\hat{u}+\frac{1}{2}\vec{V}.\vec{V})\)
C. \(\frac{\partial}{\partial t}(\hat{u}+\frac{1}{2}\vec{V}.\vec{V})\)
D. \(\frac{D}{Dt}(\hat{u}+\vec{V}.\vec{V})\)
Answer» C.


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