Answer:
Here, maximum stress \[={{10}^{9}}\,Pa,\,\,h=3\,km=3\times
{{10}^{3}}\,m;\] \[p(\text{water})={{10}^{3}}\,kg/{{m}^{3}}\] and \[{{h}_{1}},{{h}_{2}}\].
The
structure will be suitable for putting upon top of an oil well provided the
pressure exerted by sea water is less than the maximum stress it can bear.
Pressure due to sea water,
\[{{\text{h}}_{\text{1}}}\text{=}\frac{\text{2Scos
}\!\!\theta\!\!\text{ }}{{{\text{r}}_{\text{1}}}\text{ }\!\!\rho\!\!\text{
g}}\]
Since the pressure of sea water is less than the maximum
stress of 109 Pa, the structure will be suitable for putting upon top of the
oil well.
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