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: Mixing two liquids with equal mass, find pressure

  1. May 17, 2010 #1
    1. The problem statement, all variables and given/known data
    A mass of a liquid of density ρ is thoroughly mixed with an equal mass of another liquid of density 2ρ. No change of the total volume occurs.


    2. Relevant equations



    3. The attempt at a solution
    i tried to use ρ=[tex]\frac{m}{v}[/tex]
    then v=[tex]\frac{m}{\rho}[/tex]
    therefore v1+v2=V
    [tex]\frac{m}{\rho}[/tex]+[tex]\frac{m}{2\rho}[/tex]=v
    [tex]\frac{3m}{2\rho}[/tex]=V
    [tex]\frac{3m}{2V}[/tex]=[tex]\rho1[/tex]
    [tex]\rho1[/tex] \ [tex]\rho[/tex]
    in the end i get [tex]\rho1[/tex] = [tex]\frac{3}{2}[/tex][tex]\rho[/tex]

    but i was wrong couldnt find out the reason ><
     
  2. jcsd
  3. May 17, 2010 #2

    rl.bhat

    User Avatar
    Homework Helper

    Re: Pressure

    Total volume V = 3m/2ρ

    Total mass = 2m

    So new density ρ' = 2m/V = ....?
     
  4. May 17, 2010 #3
    Re: Pressure

    oh no
    !@#$%^&*()
    =.=
    cant think that this could be that simple ><
    but anyway its the right answer
    ths for solving it for me
     
    Last edited: May 17, 2010
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook