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Finding Mass of an Object [Fluid Mechanics]

  1. Dec 14, 2008 #1
    A cube of wood having an edge dimension of 20.0 cm and a density of 650kg/m^3 floats on water. a) what is the distance from the horizontal top surface of the cube to the water level?
    b)what mass of lead should be placed ont eh cube so that the top of the cube will be just level with the water?

    A is 7.0cm
    B is 2.80kg

    Vfluid/Vobject= Dobject/Dfluid

    I figured out how do to the first part but im having trouble trying to find out part B.
    I know you have to use V=m/d but the problem is I can't seem to find volume.
  2. jcsd
  3. Dec 14, 2008 #2

    Doc Al

    User Avatar

    Staff: Mentor

    What's the volume of a cube?
  4. Dec 14, 2008 #3
    sorry its 8000cm^3
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