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Homework Help: Buoyant Force question

  1. Mar 27, 2007 #1
    1. The problem statement, all variables and given/known data

    A 0.5 kg block of wood is floating in water. What is the magnitude of the buoyant force acting on the block.

    2. Relevant equations

    :confused: :confused: :confused:

    B=Buoyant force: W=weight; fl=fluid; m=mass; V=volume; DEN=density;

    There are a couple of equations that our professor gave us, but I am totally confused how to use them.

    B=Wfl & Wfl=Wm & Vm>Vfl & DENflVfl=DENmVm

    3. The attempt at a solution

    I have figured weight of the mass--W=mg, which is 4.9N

    Looking at the first two equations, I would lean toward the thought that 4.9N is the answer, but that seems too easy. Am I making this more complicated than it needs to be, or I am truly as confused as I feel?
  2. jcsd
  3. Mar 27, 2007 #2


    User Avatar
    Science Advisor
    Homework Helper

    Sometimes questions are easy. You are correct - after all the block is floating.
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