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Homework Help: Basic Fluids Problem with Density

  1. Jan 20, 2009 #1
    1. The problem statement, all variables and given/known data

    A typical mud is compsed of 76 wt% sand and 24 wt% water. What is the density?

    2. Relevant equations

    No relevant equations but density of sand is 951 kg/m^3 and 1 kg/m^3 for water.

    3. The attempt at a solution
    Just multiplied the density by the percentage and added them up. Dont know if its correct. Answer came out to be 723 kg/m^3
  2. jcsd
  3. Jan 21, 2009 #2


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    Homework Helper

    That's incorrect. That's the wrong density for water, plus your current approach is incorrect. There are probably relevant equations in your text book. Keep looking. Or, you can derive it yourself.
  4. Jan 21, 2009 #3


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    The trick here is that they give you the pecentages in weight. Assume that your mixture is 1 kg. From here given the percentages, you can get the weight of each part; this will simply be the percentage. Now given the density of each part and the weight, you can find the volume.

    Given the weight (1 kg) and the volume, you can get the final mixture's density.
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