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Grabber - statics example

  1. Feb 10, 2017 #1
    Hello,

    We should get the length x , when the grabber can just hold the box.

    yTBz.png

    I made two moment equations:

    e[czech]{babel}%20M_{1}=\frac{G}{2\mu%20}*\sqrt{(l_{1}+l_{2})^{2}+(\frac{b}{2})^{2}}\end{align*}.gif

    yle\begin{align*}\usepackage[czech]{babel}%20M_{2}=\frac{G}{2}*\sin%20\alpha%20*%20x\end{align*}.gif

    Then I put them together into one equation: mathtex.gif

    And from that equation I found out x: mathtex.gif


    Unfortunately the result seems to be wrong. Can you please help me? Where I made the mistake?
     
  2. jcsd
  3. Feb 11, 2017 #2
    i think the frictional force balance the wight of the box.we have to give the normal force on the box that give rise to the friction by giving a torque to the grabber
     
  4. Feb 11, 2017 #3
    I finally got it. Here is the solution.

    Ehpw.png
     
  5. Feb 12, 2017 #4
    Yes,that is the correct answer:smile:
     
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