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Homework Help: A duck is floating on a lake with 25% of it's volume beneath the water

  1. Nov 19, 2012 #1
    1. The problem statement, all variables and given/known data

    A duck is floating on a lake with 25% of it's volume beneath the water. What is the average density of the duck?

    2. Relevant equations

    Not sure of going about this problem

    3. The attempt at a solution

    I know that p(rho) = m/V
     
  2. jcsd
  3. Nov 19, 2012 #2
    Re: Density?

    You need to equate the weight of the duck with the buoyant force exerted by the water on the duck.
     
  4. Nov 19, 2012 #3
    Re: Density?

    Ok well than F(buoyant) = F(duck)?
     
  5. Nov 19, 2012 #4
    Re: Density?

    Yes. :smile:

    I guess it would be better to write F(duck) as weight of duck.
     
  6. Nov 19, 2012 #5
    Re: Density?

    I'm still lost on finding the average density of the duck.
     
  7. Nov 19, 2012 #6
    Re: Density?

    Please show us your attempt so that we can help you.

    What's the buoyant force on the duck?
     
  8. Nov 19, 2012 #7
    Re: Density?

    The buoyant force is the 25% of t he duck submerged into the water?
     
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