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Homework Help: Where does a body weigh lightest?

  1. Oct 28, 2012 #1
    1. The problem statement, all variables and given/known data

    Hot oil, Hot water, Cold Oil, Cold water

    2. Relevant equations

    Upthrust according to flotation principle

    3. The attempt at a solution

    It will weight lightest when Upthrust by the fluid is highest, which should be cold water.

    Answer given was " cold oil".
     
  2. jcsd
  3. Oct 28, 2012 #2

    CWatters

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    I think you're right and the answer is wrong. Oil floats on water because it's less dense.
     
  4. Oct 28, 2012 #3

    rcgldr

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    Only some forms of oil are denser than water, and a person's body weight doesn't change because it's floating, it's just that buoyancing is providing some countering upwards force, which would make this a trick question.
     
  5. Oct 28, 2012 #4
    This was not meant to be a trick question, I am sure.
     
  6. Oct 28, 2012 #5

    CWatters

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    Most types of oil float on water so pretty sure the given answer is wrong.
     
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