Boron oxide $($B$2$O$3)$ is produced by a melting process at $750C.$ The molten oxide is flowing down on an inclined surface angle with the vertical is $50\backslash$deg having a width, W of $2$ m $.$ The thickness, the molten oxide can be $6$ mm maximum.

The density of the oxcide is given by $(\frac{g}{c}m3]=1\mathrm{.}347+\frac{157\mathrm{.}9}{T}[K]$

and the viscosity by equation

Where $(-lnA)=12\mathrm{.}3$ and $B=13\mathrm{.}2$

Determine

a$)$ the average velocity of the flow $(\frac{m}{s}),$

b$)$ It ahis a Inminar fow?

d$)$ the volumetric Aow rate $(\frac{m^3}{s}),$

d$)$ the mass flow rate $(k\frac{g}{s}).$

e$)$ the shear stress

he mean residence time of B$2$O$3$ on the plane.