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: Wheelbarrow in Static equilibrium

  1. Mar 20, 2010 #1
    1. The problem statement, all variables and given/known data
    A wheelbarrow has a mass of 35.0 kg without the wheel. When empty, the center of mass is 0.400 m from the axle. A load with a mass of 55.0 kg is put in the wheelbarrow, 0.600 m from the axle. Ophelia holds the handles of the wheelbarrow, 1.20 m from the axle. She lifts the handles so that they make a 25.0° angle with the ground. What is the upward force that Ophelia applies to the handles in order to hold the wheelbarrow in that position?


    2. Relevant equations
    [tex]\Sigma[/tex]Fx=0
    [tex]\Sigma[/tex]Fy=0
    Torque=rFsin[tex]\vartheta[/tex]

    3. The attempt at a solution
    [tex]\Sigma[/tex]Fx=0 I figure there's nothing to find out here because it's fairly obvious...I think.

    [tex]\Sigma[/tex]Fy=0

    Here, I figure it's mg=Fnormal + Fophelia
    and since Ophelia is applying a torque force around the wheel:
    mg=Fnormal + rFosin[tex]\theta[/tex]

    Some problems: I don't know how to solve for Fo since Fnormal is in there too and is unknown, and I don't know how the difference in xcm should come in other than choosing axis of origin (of which I chose the wheel)
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 22, 2010 #2
    Am I not getting responses because everyone is as lost as me? Alas!
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook