Fluid mechanics,wooden block in water and oil

  • Thread starter hannam
  • Start date
  • #1
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Homework Statement


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?


Homework Equations



fb=p liquid * v sinked*g
p object * v object = p liquid * v sinked
P1= Po+ p*h*g

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 :(
 

Answers and Replies

  • #2
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here s the pic of question
 

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