Calculating Pressure in a Swimming Pool: Total Force and Absolute Pressure

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Homework Help Overview

The discussion revolves around calculating the total force and absolute pressure at the bottom of a swimming pool, as well as the pressure against the side of the pool near the bottom. The problem involves understanding the concepts of pressure in fluids and the role of atmospheric pressure in these calculations.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore whether atmospheric pressure should be included in the calculation of absolute pressure and discuss the relationship between pressure at different points in the fluid. Questions arise about when to consider atmospheric pressure in calculations.

Discussion Status

Participants are actively questioning the wording of the problem and the definitions of absolute versus gauge pressure. Some guidance has been offered regarding the inclusion of atmospheric pressure, but there is no explicit consensus on the approach to take.

Contextual Notes

There is some confusion regarding the definitions and applications of pressure types, particularly in relation to the problem's requirements. Participants are considering the implications of fluid behavior in their reasoning.

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Homework Statement


(a) What are the total force and the absolute pressure on the bottom of a swimming pool 22.0 m by 8.5 m whose uniform depth is 2.0 m? (b) What will be the pressure against the side of the pool near the bottom?

For a), the absolute pressure, I am not sure if I need to add atmospheric pressure? I am little confused with when to include atmospheric pressure. b) To find the pressure against the side of the pool, I need to use total force/Area (height*width)?
Thanks for help.
 
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a, is poorly worded - I would guess that absolute pressur eincludes one atmosphereof air pressure as well.
b, The pressure on the side of the pool is the same as the pressure downwards at that point - because water is a fluid.
 
mgb_phys said:
a, is poorly worded - I would guess that absolute pressur eincludes one atmosphereof air pressure as well.
b, The pressure on the side of the pool is the same as the pressure downwards at that point - because water is a fluid.

okay. But can you tell me when do we usually include atmospheric pressure?
 
MIA6 said:
okay. But can you tell me when do we usually include atmospheric pressure?

When the total pressure is comparable to the atm pressure (slightly subjective), or when specifically told in the problem.
 
I think you can add the ATM pressur to gauge pressur If you whant apsolute p .
to calculat total force = apsolute p * Area
 

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