Why didn't Bernoulli's equation work for other values of water height?

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In summary, the conversation discusses a large tank of water with a hose connected to it, and the relationship between the water height and the compressed air pressure inside the tank. It also mentions using Bernoulli's equation to calculate the speed of water flow from the hose at different heights, and the troubleshooting of incorrect answers for parts b and c. The speaker ultimately figures out the issue and reorganizes the equation to solve the problem.
  • #1
CollectiveRocker
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A large tank of water has a hose connected to it. The tank is sealed at the top and has compressed air between the water surface and the top. When the water height h has the value 3.5 m , the absolute pressure p of the compressed air is 4.20 * 10^5 Pa. Assume that the air above the water expands at cosntant temperature, and take the atmospheric pressure to be 1.0 * 10^5 Pa. a) What is the speed with which water flows out of the hose when h = 3.50 m? b) and c) just give other values to plugs in for the height. Now the question I have is: Can't i just use Bernouilli's equation? On the first one i did and got the right answer, but on part b and c i didn't, so what is the problem?
 
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  • #2
Perhaps if you gave more details of what you did for parts b and c we could help you. Your troubles could simply be unit conversion how could we know when we do not have enough information.
 
  • #3
Basically all i did was to plug the different heights in, the exact same place i did in part a), but i still got the wrong answer. Am i using the wrong procedure?
 
  • #4
Any ideas fellas?
 
  • #5
I could really use some help guys. If you have any ideas, they would be helpful.
 
  • #6
Oh duh, I figured it out. Just had to reorganize the Bernouiili Equation.
 

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