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!

Adding Vectors

  1. May 20, 2013 #1
    I am curious if I am setting this problem up right.

    Three forces act on the bracket. Determine the magnitdue and direction theta of F2 so that the resultant force is directed along the positive u axis and has a magnitude of 50lb.



    This is how i set it up. If this set up is correct I am having trouble evluating the tan(25+theta) part. If there is an easier way please help.
  2. jcsd
  3. May 20, 2013 #2
    sorry for the verticle photo.
  4. May 20, 2013 #3


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    You could use the angle sum identity for tangent: ##\displaystyle \ \tan(\alpha + \beta) = \frac{\tan \alpha + \tan \beta}{1 - \tan \alpha \tan \beta}\ .##

    But I think it would be better to solve for tan(25° + θ), then take the arctan of both sides to get a numerical result for 25° + θ . (Make sure that's in degrees.) Subtract 25° from that.
    Last edited by a moderator: May 6, 2017
  5. May 20, 2013 #4
    ahhhhh ok thanks, ill try this in the morning.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Threads - Adding Vectors Date
Adding Vectors: Problem 2 Jun 17, 2017
Adding Vectors Jun 17, 2017
Adding Vectors using Cefore Method Nov 16, 2016