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How to apply bernoullie's equation

  • #1

Homework Statement


A jet of water having velocity v = 10m/s and stream cross section = 2cm^2 hits a flat plate perpendicularly, with water splashing out parallel to plate. Find the force that plate experiences.
density of water d=1000kg/m^3

Homework Equations


0.5dv^2 = p


The Attempt at a Solution


on applying berno.. i calculated pressure and then used force = pressure*area
but answer is wrong why?
 

Answers and Replies

  • #2
31
0
You say "the answer is wrong"; we need a bit more information. What calculations have you carried out and what answers have you obtained?
 
  • #3
i calculated pressure = 50000 Area = 2cm^2
force = 50000*(2/10000)=10N
but the answer is 20N
 
  • #4
31
0
Well your equation seems correct and with the values as given so does your answer... My concern is with the description of the area in the question as stated. Is it possible that the questioner intended to write that as an area of [itex]2^2[/itex] cm[itex]^2[/itex] = 4 cm[itex]^2[/itex]? That would account for the factor of two.
 
  • #5
no the data is correct i think "with water splashing out parallel to plate" is the key point to he problem and this is where i make a mistake while applying Bernoulli
any clue
 
  • #6
it is 2 sq-cm
 
  • #7
concept of impulse is involved
 

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