Question $2$

$($a$)$ An impermeable wall, $7\mathrm{.}5m$ long, supports a $5m$ depth of water $($Figure $2).$

Determine the total hydrostatic force on the wall and the overturning moment

about the base of the wall. $[6$ marks$]$

$($b$)$ Draw a sketch of a Pitot tube and explain what it is and how it works. If a

Pitot tube gave a reading of $H=0\mathrm{.}3m$ in a water pipe what further information

can be deduced from this? $[6$ marks$]$

$($c$)$ A prefabricated component of an offshore structure is being towed out to

sea to the construction site. The component, shown in Figure Q$2$c$,$ is

rectangular and measures $8\mathrm{.}9m4\mathrm{.}2m$ in plan. It has an average density of

$710k\frac{g}{m^3}$ and its centre of gravity is located at half its height. Calculate the

depth of immersion, $h,$ and determine whether the component will float stably.

The density of seawater can be taken as $1,035k\frac{g}{m^3}.[8$ marks$]$