Pressure due to uneven water distribution in connecting pipe

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Homework Help Overview

The discussion revolves around understanding pressure differences in a system of connecting pipes with uneven water distribution. The original poster expresses confusion regarding the relationship between pressure at different points in the system, particularly between points C and D, and how a specific value of 15h is derived in relation to atmospheric pressure.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between pressure at points C and D, questioning how the pressure difference is calculated and the significance of the value 15h. There are attempts to clarify the role of atmospheric pressure in this context.

Discussion Status

Some participants have provided guidance on analyzing the pressure at various points in the system, suggesting a step-by-step approach. However, there remains a lack of consensus on the derivation of the value 15h, indicating ongoing exploration of the topic.

Contextual Notes

The discussion includes references to a diagram that is not visible in the thread, which may limit the understanding of the problem setup. There is also an indication that the original poster is seeking a formula but has not yet established clarity on the concepts involved.

rwooduk
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Homework Statement


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Homework Equations


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The Attempt at a Solution


Im confused by this question, just looking at the diagram without any maths you can see what would happen. C and D would want to reach equilibrium and be at the same level so the pressure down on D would be the difference in heights of the fluid. ie. 12 h times p g. but the equation says 15 not sure how they arrived at that? could anyone here help please? i am trying to get the formula given
 
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The 15h in the answer relates the pressure at D to atmospheric pressure. You are right that the pressure at D is related to the pressure at C by 12h.
 
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TSny said:
The 15h in the answer relates the pressure at D to atmospheric pressure. You are right that the pressure at D is related to the pressure at C by 12h.

Many thanks for the reply! ok so the pressure at D, is the atmospheric pressure minus (because it acts in the opposite direction) the pressure due to unequilibrium? I still can't see where the 15 comes from, please could you expand a little? thanks again
 
See if you can work your way through the system point by point. Find P at A, then B, then C, then D. (You can probably skip A.)
 
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TSny said:
See if you can work your way through the system point by point. Find P at A, then B, then C, then D. (You can probably skip A.)

ok will try that, thanks again!
 

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