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!

Static Equilibrium and tension

  1. Apr 13, 2007 #1
    1. The problem statement, all variables and given/known data
    A 10-m uniform beam of weight 100 N is supported by two ropes at its ends. If a 400 N person sits at 2.0 m from the left end of the beam, what is the tension in the left rope?

    I thought the answer would be:
    3. The attempt at a solution
    100*5 + 400*7 = T*10
    3300 = T*10

    T = 330 N

    But it's not correct. What am I doing wrong?

    A book weighs 6 N. When held at rest above your head the net force on the book is? I say -6 N. Is this correct?

  2. jcsd
  3. Apr 13, 2007 #2
    Ah simple math error. It's 370.
    Any feedback for the other question? I have another topic about the same subject that is actually more urgent. Thanks!
  4. Apr 13, 2007 #3
    -6 sounds like a good answer?
  5. Apr 13, 2007 #4
    The force exerted by your head on the book is 6 N. I would not call this the net force though. The net force on the book is 0 because it is *at rest*.
  6. Jan 17, 2009 #5
    ya i think you are right
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Static Equilibrium and tension