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: Simple factoring that i can't do

  1. Feb 7, 2008 #1
    I need to solve for T1. the problem is a tension problem with a chandelier, but i have found all the equations to solve for the T1. I solve for T1 but the computer says its wrong. here are the equations and my answer. please help


    (T1*cos(x1))/cos(x2) = (mg - T1*sin(x1))/sin(x2)

    i keep getting

    (cos(x2)mg)/2(sin(x2)cos(x1)+cos(x2)sin(x1)) = T1

    x's are angles. someone pleas ehelp
     
    Last edited: Feb 7, 2008
  2. jcsd
  3. Feb 7, 2008 #2
    well i got (0.5*mg*sin(x2))/cos(x1))=T1.
     
  4. Feb 7, 2008 #3
    can anyone verify this because i only get one shot left
     
  5. Feb 7, 2008 #4
    hmmm, im sorry bout that, do you know what they mean by multiplicative factor?
     
  6. Feb 7, 2008 #5
    i don't know but i haven't entered in your answer yet. i just want to make sure because i only have one chance left
     
    Last edited: Feb 7, 2008
  7. Feb 7, 2008 #6
    someone please help me
     
  8. Feb 7, 2008 #7
    i get:
    T1 = mg / (cos(x1)*tan(x2)+sin(x1))

    let me know if its correct.
     
  9. Feb 7, 2008 #8
    AFG34, you got it right. thanks

    cna i ask how you did that?
     
  10. Feb 7, 2008 #9
    first you multiply both sides by sin(x2); this gets rid of the fraction in the right side, and the left side reduces to T1*cos(x1)*tan(x2). Then you just bring the Tensions to one side and factor them out.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook