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Velocity of water in water hose

  1. Apr 8, 2016 #1
    1. The problem statement, all variables and given/known data
    in this problem , the author assume that velocity inside the hose is very low , near to 0 . but , it's not stated in the question , it's the anaylsis of the author . How do we know that the velocity of water in hose is close to 0 , if it is not mentioned earlier?

    2. Relevant equations


    3. The attempt at a solution
     

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  3. Apr 8, 2016 #2

    billy_joule

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    Because the question implies it. Draw a diagram and it should show itself.
     
  4. Apr 8, 2016 #3
    i still dont understand , can you explain ?
     
  5. Apr 8, 2016 #4

    billy_joule

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    The question states the hose is mainly closed and only a thin jet remains. Apply the continuity equation, if the jet outlet area is much smaller than the hose area then velocity in the hose must be close to zero.
     
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