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Explanation for hydrodynamic problem

  1. Jan 9, 2017 #1
    • New member advised that an attempt at a solution is required for all homework help requests.
    1. The problem statement, all variables and given/known data
    See the photo of the problem in the attachment

    2. Relevant equations
    Bernoulli equation and continuity equation

    3. The attempt at a solution
    I don't know from where to begin , i only can get the velocity of fluid when it reaches the hole
     

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    Last edited: Jan 9, 2017
  2. jcsd
  3. Jan 9, 2017 #2

    haruspex

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    You must have been taught something on the topic. Any standard equations relating to fluid flow?
     
  4. Jan 9, 2017 #3
    Yeah , bernoulli equation and continuity equation.
     
  5. Jan 9, 2017 #4

    haruspex

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    You should have listed those under Relevant Equations in the template.
    So try applying Bernoulli's. What do you get?
     
  6. Jan 9, 2017 #5
    Only the velocity of fluid at the hole , i don't know what to do i don't know any other information of how to get the distance x that the fluid will cover
     
  7. Jan 9, 2017 #6

    haruspex

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    That's a good start. (Next time, please show how far you got in your initial post, otherwise you risk having your post deleted.)
    If you throw an object horizontally at a known speed and known height, can you figure out where it will land?
     
  8. Jan 9, 2017 #7
    I think it's by laws of motion !
     
  9. Jan 9, 2017 #8

    haruspex

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    Yes, specifically, motion under constant acceleration. What equations do you know for that?
     
  10. Jan 9, 2017 #9
    D=Vot+1/2at^2
     
  11. Jan 9, 2017 #10

    haruspex

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    Right. How can you apply that here?
     
  12. Jan 9, 2017 #11
    That the problem I've faced , i don't know how to apply it here
     
  13. Jan 9, 2017 #12

    haruspex

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    What facts do you know in this problem regarding speeds, time, distances and accelerations?
     
  14. Jan 9, 2017 #13
    I only know the distance from the hole to ground y is 30 cm and the velocity of fluid when it reaches the hole , i only don't know the time when it reaches ground and the acceleration of fluid .
     
  15. Jan 9, 2017 #14

    haruspex

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    What is causing it to accelerate, once it has left the tank?
     
  16. Jan 9, 2017 #15
    Only gravity i think
     
  17. Jan 9, 2017 #16

    haruspex

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    Right, so you know the vertical and horizontal (0) accelerations.
    Apply your equation for both directions.
     
  18. Jan 9, 2017 #17
    So i can get the time from the y-direction equation and put it in the x-direction equation so i can get the distance x , is that right ?!
     
  19. Jan 10, 2017 #18

    haruspex

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    Right!
     
  20. Jan 10, 2017 #19
    But why you assumed that the horizontal acceleration = 0 , if i didn't know that it equals 0 i can't solve it , so i need to understand why it equals 0
     
  21. Jan 10, 2017 #20

    haruspex

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    What force is there to accelerate it horizontally?
     
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