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Buoyant Force

  1. Jan 17, 2012 #1
    So I'm in a general physics class and the teacher asked us to find the percentage of a sphere immerses in water and I can't seem to figure out how to find the percentage. I was wondering if there's an equation to use or what to find the answer. Thanks.
     
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  3. Jan 17, 2012 #2

    Simon Bridge

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    Welcome to PF.
    When you get stuck like this, try thinking of a similar situation you do know the answer to.

    Hint: you know ice floats approximately 90% submerged? (nine-tenths)

    What is the density of ice divided by the density of liquid water?
    What is that as a percentage?
     
  4. Jan 17, 2012 #3
    Okay that makes sense. In this same question, it asks to draw a free body diagram to find all the forces. I only found the buoyant force and the gravity force and those don't allow me to have two densities. So did I do the FBD wrong and I'm missing some forces or do I rearrange archimedes' principle to substitute another density? Hope this makes sense.
     
  5. Jan 17, 2012 #4

    Simon Bridge

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    Is the buoyant force related to the densities?
     
  6. Jan 17, 2012 #5
    I'm assuming so that way I can solve for the percentage.
     
  7. Jan 18, 2012 #6

    Simon Bridge

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    So if you have a buoyant force in your free body diagram, that accounts for the two densities right?
     
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