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Underwater upthrust problem

  1. Dec 5, 2004 #1
    would there be an upthrust or not if a perfectly smooth object was on a perfectly smooth ocean floor?

    I expect that since there is no water beneath the object there is no pressure to provide an upthrust, there would only be pressure above the object creating a downward force!?
  2. jcsd
  3. Dec 5, 2004 #2
    If you're saying there is no room for even a molecule to get between the object and the ocean floor, then the object is actually a part of the ocean floor. And in that case, I think you're right - the 'object' would be held down by the water pressure.
  4. Dec 5, 2004 #3
    and if there would be room for just one molecule?
    Does the fact that they are perfectly smooth mean that there is no room for the molecules?
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