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Water pressure on base of cube

  1. Oct 2, 2013 #1
    "A cube of wood of side 4cm floats in fresh water with 1:4 showing above the surface.
    Calculate a) the water pressure on the base of the cube and b) the density of the wood"

    All I can work out is that the density of fresh water is 1000kgm^-3 and the area of the base is 1.6 x 10^-5 m.

    Please can someone help?? I don't know where to start...
     
  2. jcsd
  3. Oct 2, 2013 #2
    How deep (below surface) is the bottom of the cube?
     
  4. Oct 2, 2013 #3
    3cm?
     
  5. Oct 2, 2013 #4

    arildno

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    Right!

    Remember that the hydrostatic water pressure strictly depends on the vertical, that is, it doesn't matter whether you calculate the pressure directly BENEATH the cube, or anywhere else along the horizontal line lying 3 cm below the surface.
     
  6. Oct 2, 2013 #5
    OK, now calculate the pressure at this depth.
     
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