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Homework Help: Submerged object/density

  1. Dec 12, 2007 #1
    1. The problem statement, all variables and given/known data
    an alloy of copper and gold displaces 1.935 cm^3 of water. It has a mass of 33.44g. If gold has a density of 19.3g/cm^3 and copper has a density of 8.9g/cm^3, what is the percent of gold by mass in the object


    2. Relevant equations
    mg=pVg


    3. The attempt at a solution

    m alloy= p alloy*V alloy
    p alloy = m/V =33.44/1.935 =17.3g/cm^3
    i am stuck at this point i found the density of the alloy what do i do next?
     
  2. jcsd
  3. Dec 12, 2007 #2

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    What happened to the copper part?
     
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