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Floatation in water?

  1. May 4, 2007 #1
    hi, I am after some help from a person with a understanding of water displacement principles.
    On a small scale- if an empty 5 LTR bucket is floated on a body of water, it will float, if the bucket is filled with water it sinks.
    But if the empty bucket is place upside down, thus trapping a 5Ltr volume of air, the weight required to sink the bucket is more than the weight of the 5 Ltrs of water, is this true, and is there a formula for working out the volume of Air trapped and what weight is required to sink it?
  2. jcsd
  3. May 4, 2007 #2
    No, the force is equal to the weight of 5 litters of water.
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