Question $1)[40$ Pts$]$A$)$ What are the factors affecting the choice of the relation that estimates the Nu as afunction of Re and Pr$?[20$ Pts$]$B$)$ What is meant by the internal flow? Give an example. $[5$ Pts$]$C$)$ What is meant by the external flow? Give an example. $[5$ Pts$]$D$)$ What is meant by the Drag force? $[10$ Pts$]$Question $2)[50$ Pts$]$A stainless steel ball having a diameter of $25$ cm and a density of $8055$ kg$/$m$3$ and aspecific heat capacity of $480$ J$/$kg$.$K is removed from the oven at a uniform temperatureof $300$C$.$ The ball is then subjected to the flow of air at $1$ atm and $25$C with a velocityof $3$ m$/$s$.$ The surface temperature of the ball eventually drops to $200$C$.$The dynamic viscosity of air at the average surface temperature is $2\mathrm{.}76$x$10-5$ kg$/$m$.$s$.$At $1$ atm and $25$C$,$ air has a thermal conductivity of $0\mathrm{.}02551$ W$/$m$.$k$,$ a kinematicviscosity of $1\mathrm{.}562$x$10-5$ m$2/$s$,$ a dynamaic visosity of $1\mathrm{.}849$x$10-5$ kg$/$m$.$s and a Pr of $0\mathrm{.}7296.$Estimate the following.A$)$ Reynolds Number $[10$ Pts$]$B$)$ Nusselt Number $[15$ Pts$]$C$)$ Convective heat transfer coefficient $[10$ Pts$]$D$)$ Heat transfer rate $[15$ Pts$]$Question $3)[10$ Pts$]$State the assumptions for applying Bernoullis equation for a fluid flow.Question $1)[40$ Pts$]$

A$)$ What are the factors affecting the choice of the relation that estimates the Nu as a function of Re and Pr $?[20$ Pts$]$

B$)$ What is meant by the internal flow? Give an example. $[5$ Pts$]$

C$)$ What is meant by the external flow? Give an example. $[5$ Pts$]$

D$)$ What is meant by the Drag force? $[10$ Pts$]$