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Buoyant forces problem

  1. Dec 14, 2014 #1
    1. The problem statement, all variables and given/known data
    Calculate the buoyant force on a solid object made of copper and having a volume of 0.2 m^3 if it is submerged in water.
    2. Relevant equations
    B = pVg

    3. The attempt at a solution
    I followed the above equation and did
    B = (8.92 x 10^3 kg/m^3)(0.2 m^3)(9.8 m/s^2)
    B = 1.74 x 10^4
    The correct answer is 1.96 x 10^3
     
  2. jcsd
  3. Dec 14, 2014 #2

    mfb

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    Staff: Mentor

    Why do you use the density of copper?
     
  4. Dec 15, 2014 #3
    I'm not sure it's just part of the formula. p = density
     
  5. Dec 15, 2014 #4

    mfb

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    Staff: Mentor

    A density, sure, but not the one of copper.
     
  6. Dec 24, 2014 #5
    Ok thanks! I figured it out.
     
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