$($e$)$ In a wind tunnel test, the drag of a circular tube, $0\mathrm{.}1$ m diameter and $1$ m high, is measured

as $4\mathrm{.}5$ N $.$ The flow speed is $8\frac{m}{s}.$ What is value of the drag coefficient?

$[5$ marks$]$

$($f$)$ State the no$-$slip condition.

$[5$ marks$]$

$($g$)$ What is Eddy $($or Turbulent$)$ viscosity?

$[5$ marks$]$

$($h$)$ In terms of strain, how are the stresses in a fluid flow different from the stresses

within a solid?