1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Which equation is correct about the forces

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

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


    User Avatar
    2017 Award

    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


    User Avatar
    Homework Helper

    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted