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Which equation is correct about the forces

  1. Apr 6, 2013 #1
    1. The problem statement, all variables and given/known data
    2rtzt.jpg

    The books answer is "D", no clue why though, Any one can explain?
    Thank you
     
  2. jcsd
  3. Apr 6, 2013 #2

    mfb

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    Staff: Mentor

    [strike]If you add those 15N and F, the resulting force has to have the same angle theta relative to the horizontal axis. If you draw a triangle there, you directly get the relation.[/strike]

    Edit: Oh crap, Curious3141 is right. I did not check the result, just saw that you get the tan there.
    And strictly speaking, there is a "N" missing as well.
     
    Last edited: Apr 6, 2013
  4. Apr 6, 2013 #3

    Curious3141

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    All the given options are wrong. The correct answer is ##\displaystyle 15 = F\tan \theta##, which is not one of the given options, even though "D" is closest.
     
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