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Surface tension

  1. Sep 7, 2009 #1
    1. The problem statement, all variables and given/known data

    An ant weighs 5 mg and requires 0.5 mm of edge to "walk on water" with the aid of surface tension. How much edge is required for a human who weighs 50 kg?

    2. Relevant equations



    3. The attempt at a solution

    I'm assuming that the relationship between area and weight is linear in this case. Is this a correct assumption?? If so, then I know how to work the problem.
     
  2. jcsd
  3. Oct 7, 2009 #2
    yes,are directly proportional to weight
     
  4. Nov 28, 2010 #3
    CAn you explain meaning of edge, I've never used this term in surface tension problems.
    And in my view surface tension can't bear 50kg force.
     
  5. Nov 28, 2010 #4

    Doc Al

    User Avatar

    Staff: Mentor

    Think of 'edge' as the perimeter of an area.
    Wouldn't that depend on how much 'edge' you have? (That's the point of the exercise.)

    (Note that you are responding to a post that is over a year old.)
     
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