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Amount of styrofoam submerged

  1. Nov 14, 2011 #1
    I'm trying to find how much of a cube of styrofoam is submerged in water without measuring because the amount is very small.

    Capture.JPG

    If I have a block of styrofoam with a mass of 10g and a density of 0.018g/cm3
    How much of the styrofoam will be submerged?
     
  2. jcsd
  3. Nov 14, 2011 #2
    MY guess would be 1mm, 10g of water has a volume of 10cm^3, so the same volume of styrofoam to displace same volume of water would be .1cm *10 cm * 10cm
     
  4. Nov 14, 2011 #3
    I'm a little bit confused. Can you explain that again more thoroughly?
     
  5. Nov 14, 2011 #4
    So the weight of the styrofoam is 10g, to float, it must displace 10g of water

    The density of water is 1g/cm^3 so 10g of water has a volume of 10cm^3. That is the volume of water to be displaced by an equal volume of styrofoam, since the block has a 100cm^2 bottom, it will take a height of 1mm to reach the desired volume.
     
  6. Nov 14, 2011 #5
    Wow, simple. thanks!
     
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