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Fluid mechanics,wooden block in water and oil

  1. Jan 15, 2012 #1
    1. The problem statement, all variables and given/known data
    A cubical block of wood, 10 cm on a side, is placed in a
    glass cup whose higher end is open to the atmosphere. The
    wood is in equilibrium at the interface between water and oil
    with wood’s lower surface 2 cm below the interface. The
    density of oil is 790 kg/m3.
    a) What is the (absolute) pressure at the lower and upper face of
    the wood block?
    b) What are the mass and density of the block?


    2. Relevant equations

    fb=p liquid * v sinked*g
    p object * v object = p liquid * v sinked
    P1= Po+ p*h*g
    3. The attempt at a solution
    0.02*1 + 790*x = p wood*(2+x) =m
    does it say edge of the wood is 10 cm? my english is not very good and if it is 10 cm, i can find m.
    but still i have no idea about the pressure part.
    my exam is tomorrow. any help is appreciated :(
     
  2. jcsd
  3. Jan 15, 2012 #2
    here s the pic of question
     

    Attached Files:

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