1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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:

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook