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 mechanics problem

  1. Apr 26, 2013 #1
    Hi I cant figure out this problem, can you please help me out?
    Thank you so much!

    http://imageshack.us/scaled/landing/515/19200619.jpg [Broken]
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Apr 26, 2013 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    welcome to pf!

    hi bostonfenway! welcome to pf! :wink:

    show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
     
  4. Apr 26, 2013 #3

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    First step, figure out the components of P.
     
  5. Apr 27, 2013 #4
    Thank you for the welcome! :)

    This is what I have done so far:

    Vertical component = Pcos30 = .866P
    Moment arm = 200cos40 = 153.2
    Moment= 132.7P (ccw)

    Horiz. comp. = Psin30 = .5P
    Moment arm = 200 sin40 = 128.6
    Moment = -64.3P (cw)

    Net moment = 68.4P
    Moment arm of P = 68.4
     
  6. Apr 27, 2013 #5

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    hi bostonfenway! :smile:

    yes that's fine!

    (btw, you can check it by seeing it's Pcos20°)

    what is worrying you about that? :wink:
     
  7. Apr 27, 2013 #6
    its right? So the answer to part a is 68.4?
    What about part b? That worries me..
     
  8. Apr 27, 2013 #7

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    yes :smile:
    What about part b? That worries me..​

    by definition, the total moment (68.4) equals the total force (200) times the moment arm :wink:
     
  9. Apr 27, 2013 #8
    Got it! Thanks tiny-tim :)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Static mechanics problem
Loading...