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Homework Help: Volume and Bulk Modulus

  1. Jan 17, 2009 #1
    1. The problem statement, all variables and given/known data


    Part A
    What is the pressure at a depth of 5000 in the ocean? Given rho_water=1,030 kg/m^3
    pTotal=p_0 + rho*g*h=5.06×107


    Part B
    What is the fractional volume change of seawater at this pressure? Given B=0.2*10^10
    dV/v=p/-B =−2.53×10−2



    Part C
    What is the density of seawater at this pressure? (This is the question that I don't understand)



    2. Relevant equations

    (1)pTotal=p_0 + rho*g*h
    (2)dV/v=p/-B
    (3)p=F/A

    3. The attempt at a solution
    Part C: The liquid is incompressible. So. I guessed that the density of the liquid is still 1,030 kg/m^3 at a depth of 5,000m. And, I don't know why my answer was considered wrong.
     
  2. jcsd
  3. Jan 17, 2009 #2

    LowlyPion

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    Homework Helper

    You determined the volume change from the bulk modulus.

    But what is density? weight/volume?

    So what was occupying a m³ is now occupying less volume
    ... so isn't the density now greater since you can now squeeze more into a m³?
     
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