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Force acting on pipe

  1. Mar 22, 2016 #1
    1. The problem statement, all variables and given/known data
    why the author gave the change in velocity as (25- 25cos115) , shouldn't it be final - initial velocity , which is (25cos115 -25) ?

    2. Relevant equations


    3. The attempt at a solution
     

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  2. jcsd
  3. Mar 23, 2016 #2

    haruspex

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    I agree. At that point, the author is calculating the force the vane exerts on the water, which with positive to the right should be negative.
     
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