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Rate of river flow

  1. Sep 29, 2016 #1
    1. The problem statement, all variables and given/known data
    You want to swim straight across a river that is 76 m wide. You find that you can do this if you swim at an angle of θ = 28° from the upstream direction at a constant rate of 1.5 m/s relative to the water. At what rate does the river flow? The angle θ is measured from the river bank (directly upstream is θ = 0° while directly across the river is θ = 90°).
    (a) 1.8 m/s (b) 1.3 m/s (c) 1.6 m/s (d) 0.70 m/s (e) 2.1 m/s

    Answer:b

    2. Relevant equations
    /

    3. The attempt at a solution
    1.5 sin28° = 0.70m/s

    How can obtain answer b?

    Thanks
     
  2. jcsd
  3. Sep 29, 2016 #2

    gneill

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    Staff: Mentor

    How did you formulate your solution attempt? Did you make a sketch? If so, can you share it?
     
  4. Sep 29, 2016 #3
    Oh thanks...
    I just discover my drawing is wrong...
    The answer is by v cos theta
     
  5. Sep 29, 2016 #4

    gneill

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    Staff: Mentor

    Okay! It's great that you worked it out yourself!
     
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