Show how the differential form of the \(\mathrm{x}\)-component momentum equation [Equation (2.70a)] can be expressed using the substantial derivative:

\[ \frac{\partial(ho u)}{\partial t}+abla \circ(ho u \boldsymbol{V})=-\frac{\partial p}{\partial x}+ho f_{x}+\left(F_{x}\right)_{v i s c o u s} \]

Next, show how your result above can be generalized for the full momentum conservation equation (in differential form):

\[ \frac{\partial(ho \boldsymbol{V})}{\partial t}+abla \circ(ho \boldsymbol{V} \boldsymbol{V})=-abla p+ho \boldsymbol{f}+\boldsymbol{F}_{\text {viscous }} \]