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Homework Help: AP physics- finding buoyant force!

  1. Oct 19, 2013 #1
    1. The problem statement, all variables and given/known data

    A cubic meter of some material has a mass of 8600 kg. The block of material is lowered into a lake by a strong cable until the block is completely submerged. Find buoyant force on the block.

    2. Relevant equations

    Fb= p x V x g.
    p= density of fluid, density of water is 1 g/cm^3.
    V= displaced volume
    g=9.8 m/s

    3. The attempt at a solution
    So far I have Fb= 1g/cm^3 x V x 9.8 m/s. I need to find V or the volume displaced by the cube in water. How do I do this? Any help would be appreciated! Thanks!
  2. jcsd
  3. Oct 19, 2013 #2
    Have you tried using Fb=Fg?
  4. Oct 19, 2013 #3
    What is the equation for Fg?
  5. Oct 19, 2013 #4
    8600 kg x 9.8 m/s^2? Yes tried this, says it is wrong. My answer needs to be in newtons
  6. Oct 20, 2013 #5


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