Example question on pressure of liquids


by jayadds
Tags: liquids, pressure
jayadds
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#1
Mar16-12, 04:38 AM
P: 42
This question seemed a bit abstract to me, maybe some of you could come up with an answer with explanation?

When designing a dam should one consider the horizontal extent of the water behind the dam or the vertical depth of the water? Justify your answer.

Thanks.
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Hassan2
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#2
Mar16-12, 04:57 AM
P: 404
Hi Jayadds,

Do you mean the length of the dam wall?
jayadds
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#3
Mar16-12, 05:26 AM
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Quote Quote by Hassan2 View Post
Hi Jayadds,

Do you mean the length of the dam wall?
Yes, I mean the length of the dam wall as well as the thickness.

Hassan2
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#4
Mar16-12, 05:44 AM
P: 404

Example question on pressure of liquids


Quote Quote by jayadds View Post
Yes, I mean the length of the dam wall as well as the thickness.
I'm not an expert in this field but according to my limited knowledge, the length of the wall does matter because the total force on the wall is proportional to area and the area is proportional to the wall length as well as to the water depth ( thickness). But a more detailed explanation is about stress and strain of the wall under the forces. Long dams are build oval-shaped or in other curved surfaces to resist the forces.
tiny-tim
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#5
Mar16-12, 07:23 AM
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hi jayadds!
Quote Quote by jayadds View Post
When designing a dam should one consider the horizontal extent of the water behind the dam
i think that means, how far away the water extends from the dam
Lsos
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#6
Mar16-12, 09:56 AM
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Depth determines pressure, not volume. This means that whether you're at the bottom of the ocean or at the bottom of a narrow well, as long as the water depth is the same, the pressure and force on you will also be the same.
boneh3ad
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#7
Mar16-12, 10:05 AM
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Quote Quote by tiny-tim View Post
hi jayadds!


i think that means, how far away the water extends from the dam
This.

And to answer the original question with another, just think about it a bit. What affects the pressure, how deep you are or how much water you have around you?


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