What is the Speed of Water Supplied from a Tank to a Main?

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SUMMARY

The discussion centers on calculating the speed of water supplied from a large open tank through a pipe system using Bernoulli's equation. The problem involves a 50 cm diameter output pipe connected 10 m above a water main with a 6 cm diameter, and a gauge pressure of 9.8 E4 Pa in the water main. The expected speed of the water is 0.5 m/s, but the user struggles to derive this result using the equations provided. The key equations mentioned include Bernoulli's equation and the principle of flow rate (Av = constant).

PREREQUISITES
  • Understanding of Bernoulli's equation
  • Knowledge of fluid dynamics principles
  • Familiarity with flow rate calculations
  • Basic algebra for solving equations
NEXT STEPS
  • Review Bernoulli's equation applications in fluid mechanics
  • Study flow rate calculations using the continuity equation
  • Practice problems involving pressure and velocity in fluid systems
  • Explore the effects of pipe diameter on flow speed
USEFUL FOR

This discussion is beneficial for students studying fluid dynamics, engineers working with hydraulic systems, and anyone interested in practical applications of Bernoulli's principle in real-world scenarios.

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Homework Statement


A very large open water tank has a 50 cm diameter output pipe connected 10 m above the water main which is 6 cm in diameter. If the gauge pressure in the water main reads 9.8 E4 Pa what is the speed at whic the water is supplied?


Homework Equations



Bernoulli's equation and maybe flow rate Av = constant

The Attempt at a Solution



When I use these two equations in combination, I never get the answer I'm supposed to get, 0.5 m/s
 
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I think you can use P1 + \rhoVg + \frac{1}{2}\rhoV12 = P2 + \rhoVg + \frac{1}{2}\rhoV22Also this isn't "advanced" :p
 
I didn't think it was advanced either, until I couldn't get the right answer. ..I thought there was an "advanced" answer to what seemed like a simple question :P

Sorry to waste your time.

But I already knew which equation to use, so this doesn't help. Can someone please tell me the actual numbers to plug in? For example, if I use Av constant to put v1 in terms of v2 and solve for v2, it doesn't give me the desired answer of 0.5 m/s. I can't see what I'm doing wrong and I need a fresh perspective.
 

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