/sci/ - Science & Math » Thread #14073448

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A big boat floats in the ocean

Anonymous Sat 08 Jan 14:50:50 2022 No.14073448 View Reply Original Report

Quoted By: >>14073477 >>14073484 >>14073610 >>14075377 >>14075401 >>14075706

What is the pressure at the bottom of the water column? Does the boat weight make ir heavier?

Anonymous

Anonymous Sat 08 Jan 2022 14:59:25 No.14073477 Report

Quoted By: >>14073512 >>14073527

>>14073448
No, the pressure is the same, if it wasn't water would be flowing out from under the boat which it obviously doesn't do.

Anonymous

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Anonymous Sat 08 Jan 2022 15:00:23 No.14073484 Report

Quoted By: >>14073512 >>14073681

>>14073448
are you the same retarded OP from the other thread who can't comprehend the idea of stacking weight?

Anonymous

Anonymous Sat 08 Jan 2022 15:06:28 No.14073512 Report

Quoted By: >>14073527

>>14073484
No.
>>14073477
Why is it the same? Theres more weight above the water column.

Anonymous

Anonymous Sat 08 Jan 2022 15:09:40 No.14073527 Report

Quoted By:

>>14073512
not really, weight is still the same at the bottom
boat merely displaces its own submerged weight in water, so pressure stays constant at the bottom of the water column
>>14073477
no

Anonymous

Anonymous Sat 08 Jan 2022 15:29:09 No.14073600 Report

Quoted By:

What if the depth of the water was only one cm greater than the bottom of the boat?

Anonymous

Anonymous Sat 08 Jan 2022 15:31:16 No.14073610 Report

Quoted By: >>14073615

>>14073448
Yes. The boat will cause added pressure. But it's not all vertical. It's spread all around the boat.

Anonymous

Anonymous Sat 08 Jan 2022 15:32:51 No.14073615 Report

Quoted By:

>>14073610
this, if there is room to spare water moves and pressure remains relatively constant at the bottom.

Anonymous

Anonymous Sat 08 Jan 2022 15:49:00 No.14073681 Report

Quoted By:

>>14073484
It is the same anon who admitted to asking these kinds of questions all the time and blaming /sci/ for being unable to give him straight answers. He may be mentally ill.

Anonymous

Anonymous Sat 08 Jan 2022 17:51:16 No.14074144 Report

Quoted By: >>14075326 >>14075380 >>14075385

Whatif the boatis not in the ocean but in a pool? Would we see a significant increase of pressure at the bottom? Would it be uniform or some distribution field

Anonymous

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Anonymous Sat 08 Jan 2022 22:08:45 No.14075326 Report

Quoted By: >>14075682

>>14074144
Water is not good at bearing pressure. It would rather move out of the way than take any. Water level in the pool will be therefore increase by volume of submerged hull but water pressure will remain same in entire pool. Now if it was something more solid and dense...

Anonymous

Anonymous Sat 08 Jan 2022 22:26:13 No.14075377 Report

Quoted By:

>>14073448
>Does the boat weight make it heavier
no

Anonymous

Anonymous Sat 08 Jan 2022 22:27:21 No.14075380 Report

Quoted By: >>14075385

>>14074144
>put boat in pool
>water level rises
>pool surface needs to bear more weight now, obviously, but now it is spread over more area
>pressure is identical
this is why

Anonymous

Anonymous Sat 08 Jan 2022 22:28:29 No.14075385 Report

Quoted By:

>>14075380
>>14074144
hydraulic pressure under a free surface is proportional to depth and nothing else

Anonymous

Anonymous Sat 08 Jan 2022 22:32:34 No.14075401 Report

Quoted By: >>14075465 >>14075505

>>14073448
Technically yes.
But the pressure goes up everywhere.
The water displaced by the boat raises the water level slightly everywhere.
It is this higher water level that adds pressure.
For the water column under the boat, you can just pretend the boat isn't there and just do the calculation as if the column height is the new water level.

Anon

Anon Sat 08 Jan 2022 22:46:48 No.14075465 Report

Quoted By:

>>14075401
This anon has it right.

Anonymous

Anonymous Sat 08 Jan 2022 22:52:45 No.14075505 Report

Quoted By: >>14075537 >>14075551 >>14075594 >>14075641

>>14075401
>For the water column under the boat, you can just pretend the boat isn't there and just do the calculation as if the column height is the new water level.
bullshit, the weight of the boat has to be added though proportionally the weight of the water is the bulk of the pressure

Anonymous

Anonymous Sat 08 Jan 2022 22:58:52 No.14075537 Report

Quoted By:

>>14075505
> the weight of the boat has to be added
weight of the boat is already added trough water level increase

Anonymous

Anonymous Sat 08 Jan 2022 23:01:11 No.14075551 Report

Quoted By:

>>14075505
Run the numbers in a simple case with a cubical boat, and you should get the same results.

Anonymous

Anonymous Sat 08 Jan 2022 23:10:33 No.14075594 Report

Quoted By:

>>14075505
buoyancy is hard :(

Anonymous

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Anonymous Sat 08 Jan 2022 23:24:05 No.14075641 Report

Quoted By:

>>14075505
>NOOOO THIS CANNOT BE

Anonymous

Anonymous Sat 08 Jan 2022 23:32:10 No.14075682 Report

Quoted By: >>14075794

>>14075326
If the water level in the pool rises, then the pressure at the bottom of the pool will increase proportional to the weight of the boat distributed over the area of the pool though...

Anonymous

Anonymous Sat 08 Jan 2022 23:35:34 No.14075706 Report

Quoted By:

>>14073448
>What is the pressure at the bottom of the water column? Does the boat weight make ir heavier?

draw a line across the boat at the water level, the total boat weighs exactly the same as all the volume of the boat that is under this line would weigh if it was filled with water..

>why?
because the water would make it sink deeper if the boat would weigh more, or rise up if it weighs less, the water seeks an equilibrium like a scale does.

Anonymous

Anonymous Sat 08 Jan 2022 23:52:27 No.14075794 Report

Quoted By: >>14075813 >>14075832

>>14075682
>then the pressure at the bottom of the pool will increase proportional to the weight of the boat distributed over the area of the pool though
>conflating weight and force with pressure, again
No, anon. You may compute the pressure at the bottom of the pool based on the height of the water column above it alone. The rise of the surface of the pool in its container already accounts for the "extra weight"
Specifically, the pressure increase is NOT proportional to the weight of the boat, it is proportional to change in surface elevation which is a function of the potentially very complicated geometry of the container of the liquid. This isn't proportional at all.

Anonymous

Anonymous Sat 08 Jan 2022 23:57:28 No.14075813 Report

Quoted By: >>14075830

>>14075794
Yeah you're right. My bad. Wasn't thinking.

Anonymous

Anonymous Sun 09 Jan 2022 00:00:36 No.14075830 Report

Quoted By:

>>14075813
genuinely amazed that someone on /sci/ would actually admit when they are wrong. cheers.

Anonymous

Anonymous Sun 09 Jan 2022 00:00:52 No.14075832 Report

Quoted By: >>14075850 >>14075922 >>14075979

>>14075794
>No, anon. You may compute the pressure at the bottom of the pool based on the height of the water column above it alone. The rise of the surface of the pool in its container already accounts for the "extra weight"
The water column directly below the boat is shorter than any column adjacent to it, yet the pressure is the same?

Anonymous

Anonymous Sun 09 Jan 2022 00:04:23 No.14075850 Report

Quoted By:

>>14075832
>The water column directly below the boat is shorter than any column adjacent to it
wrong

Anonymous

Anonymous Sun 09 Jan 2022 00:17:33 No.14075922 Report

Quoted By:

>>14075832
>The water column directly below the boat is shorter than any column adjacent to it, yet the pressure is the same?

Yes. Fluids don't care about columns and geometry. Pressure in fluid is the same at any point at the same depth.

Anonymous

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Anonymous Sun 09 Jan 2022 00:27:32 No.14075979 Report

Quoted By:

>>14075832
The boat displaces its own mass in water so it's equivalent to the case where the "indentation" made by the boat is just filled with more water. See diagram.

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