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Homework Help: Cork in Water vs. Gravity

  1. May 18, 2010 #1
    Please help! I need this within like 15 minutes!

    1. The problem statement, all variables and given/known data
    A cork is held at the bottom of a bucket of water of depth d.

    The bucket is dropped from a height h, and simultaneously the cork is released. At the moment the bucket hits the ground, what height ill the cork have reached in the water?

    Density of water = 1*10^3 kg m^-3

    2. Relevant equations
    Don't know...

    I am in need of the equation, no numeical result.


    3. The attempt at a solution
     
    Last edited: May 18, 2010
  2. jcsd
  3. May 19, 2010 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    1. What is the upward buoyant force (relative to the water)? What is the upward acceleration of the cork (relative to the water - ignore water resistance)? What is the vertical position of the cork (relative to the water) as a function of time?

    2. What is the downward acceleration of the bucket and water? How long does the bucket take to fall to the ground?

    3. What is the position of the cork at that time?

    AM
     
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