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Rate of Sink-Rate of Float

  1. Yes

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  2. No

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  3. A Point on the downward surface would accelerate faster

    0 vote(s)
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  4. A sphere would sink faster

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Multiple votes are allowed.
  1. Oct 26, 2009 #1
    1. The problem statement, all variables and given/known data

    80 m2 Surface Area; 1,519,875 Pascals Pressure; 640 m3 Volume:
    2 m x 8 m x 40 m Dimensions; Mass 650,000 kg; and there is 250,000 liters of water inside.

    If I let go of the container and allow it to sink what will be the velocity of sinking?
    If I pump out 20,000 liters of water so that the container is now buoyant how fast will it rise to the surface?



    2. Relevant equations
    Weight = mg 650,000 kg * 9.8 m/s = 6374323 N
    P =F/A 6374323 N / 80 m2
    650,000 kg - 20,000 kg = 630,000 kg
    640 m3 of water = 640,000 kg
    Mass of Object - Apparent Mass when submerged = Density of Water x Volume



    3. The attempt at a solution
    650,000 kg - 640,000 kg = +10,000 kg = 10,000/640,000 = 1.6% * 9.8 m/s = .15 m/s upward or downward velocity depending on whether there is 250,000 liters inside or 230,000 liters inside
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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