Physics exercise: Pressure in this Fresh Water Tank

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Homework Help Overview

The discussion revolves around a physics exercise related to pressure in a fresh water tank, specifically focusing on fluid statics and the effects of trapped air when water is pumped into a sealed tank. Participants are exploring the implications of the setup and the application of momentum in this context.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants are attempting to clarify the scenario involving a sealed tank filled with air and water, questioning the role of the trapped air and its effects on pressure. There are inquiries about the diagrams and coordinate systems used in the problem.

Discussion Status

Some participants have provided insights into the nature of the problem, suggesting that it involves fluid statics and the need for clearer diagrams. There is an ongoing exploration of the scenario and its implications, with no explicit consensus reached yet.

Contextual Notes

There are mentions of missing information regarding the full problem description and the coordinate system, which may affect the understanding of the problem setup.

Vale Tum
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Homework Statement
The manhole cover of the fresh water tank is screwed on and the tank is filled to the indicated level. Determine the pressure at the bolts.
Relevant Equations
dF=P*dA ; H=550mm ; Varignon's Theorem
I did some of the exercise, but I don't know how to apply the momentum :'(

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Can you explain this some more. The lid is put on the tank (making a seal). The tank is initially filled with air, then water is pumped in, trapping a pocket of air between the water surface and the lid. Is that the scenario?

Or looking at your solution attempt a bit more, it looks like a fluid statics problem where you find the force acting at the center of pressure on the plate. Either way, I think you need clearer diagramming of where/how this plate is oriented on the tank.
 
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Not sure I understand the diagrams. Pls supply the full description of the problem and state your coordinate system.
 
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erobz said:
Can you explain this some more. The lid is put on the tank (making a seal). The tank is initially filled with air, then water is pumped in, trapping a pocket of air between the water surface and the lid. Is that the scenario?
I think that's what's happening. The air is compressed, so the solution is to find the change in pressure given the corresponding change in volume.
 

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