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Homework Help: Force exerted normal to the plate

  1. Apr 12, 2016 #1
    1. The problem statement, all variables and given/known data
    A jet of water , 50mm diameter , with a velocity of 18m/s , strikes a flat plate inclined at 25 degree to the axis of jet as shown in figure, Determine the normal force , P exerted on the plate when plate is stationary .

    2. Relevant equations


    3. The attempt at a solution
    6ffCbqU.jpg
    in the diagram attached , i found that the angle between the water velocity make an angle of 65 degree to the normal of the plate ,
    so my ans is F = ρA(v)(v cos theta) = 1000(pi)( [(50x10^-3) / 2 ] ^2 ) (18^2)(cos 65) = 278.7 N , is my working correct ? i dont have the ans
     

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    Last edited: Apr 12, 2016
  2. jcsd
  3. Apr 12, 2016 #2

    haruspex

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    Your algebraic expression looks right but I don't get same answer (about 4% less). Check your arithmetic.
     
  4. Apr 12, 2016 #3
    my ans is 268.8N
     
  5. Apr 12, 2016 #4

    haruspex

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    That is what I get.
     
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