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: Statics questions

  1. Sep 15, 2012 #1

    hjkklm

    User Avatar

    The units are different.
    One is the force unit, and one is the length unit.
    Then how to find the h?

    Question is attached in the file

    thanks
     

    Attached Files:

    hjkklm, Sep 15, 2012
  2. jcsd
    Phys.org - latest science and technology news stories on Phys.org
  3. Sep 15, 2012 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    Please provide your best attempt so far - that way we can give you the help you personally need.
     
    Simon Bridge, Sep 15, 2012
  4. Sep 15, 2012 #3

    hjkklm

    User Avatar

    I intend to find the all forces and then find the length through the force quantity.
    I will find the forces component firstly. x-component=150cosθ N (h cm), y-component=150sinθ N (40cm)
    150cosθ N= 170N <----but it is math error or no solution

    Then I can't find, help please.
     
    hjkklm, Sep 15, 2012
  5. Sep 15, 2012 #4

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    ... you tried to do too many steps at once.
    Start by drawing free body diagrams for the collar and the weight - separately.
    Don't forget the tension in the cable.

    If the angle between the rod and the cable (off the collar) is A, then you can express the trig functions in terms of things you know: eg. tan(A)=40/h.
     
    Simon Bridge, Sep 15, 2012
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook