1. Not finding help here? Sign up for a free 30min 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!

Help with algebraic equation

  1. Oct 9, 2007 #1
    Basic Tension question- 5 kg block hanging from a string with one side at 30 degrees and the otherside at 45 degrees.

    Fnet,x=t1x-t2x=0
    Gravity assumed at 10 m/s2 (in the book)



    I got to:
    T1(cos 30)-T2(Cos45)=0 for the total forces in the x direction and
    T1(sin 30) + T2(sin 45)-(50 N)= 0 for the y direction

    I know im supposed to use algebra but i never was very good with numbers. How I got into AP physics, I'll never know! Thanks in advance!
     
  2. jcsd
  3. Oct 9, 2007 #2
    doing good. you have two unknowns in one equation. how about some rearranging to evaluate for one T and using some substitution?

    Hint: What is T1 equal to? (not asking for the tension value)
     
  4. Oct 9, 2007 #3
    hmmm t1= t2 (cos 45)/cos 30)

    So now I have T2((cos45)/(cos30))-T2Cos45

    For which I get .8164965809 hmmmmm where did i go wrong
     
  5. Oct 9, 2007 #4
    Close, but not quite. You're right:

    T1 = T2(cos45)/(cos 30)

    now take this and use it for the T1 in the other equation, then solve for T2. You should be good to go.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Help with algebraic equation
  1. Algebra Help (Replies: 6)

Loading...