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Homework Help: What is the buoyant force acting on the rock?

  1. Jun 27, 2007 #1
    A rock with a volume of 0.2m3 is fully sumberged in water with density of 1000kg/m3. What is the buoyant force acting on the rock?

    Assume that gravity acts on the system
    0.2m3*9.81m/s2 = 1.96
    buoyant force = 1000kg/m3*1.96
    = 1960N
  2. jcsd
  3. Jun 27, 2007 #2


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    Homework Helper
    Gold Member

    Check the units of your answer. You do not have the correct expression for buoyant force. The buoyant force on an object also depends upon the volume submerged:

    [tex]F_b=\rho g V[/tex] where V is the volume submerged.
  4. Jun 27, 2007 #3
    Ok, i get it now. makes it a lot clearer.
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