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Archimedes Principal

  1. Nov 14, 2007 #1
    1. The problem statement, all variables and given/known data
    A spherical aluminum ball of mass 1.48 kg contains an empty spherical cavity that is concentric with the ball. The ball just barely floats in water.
    A. Calculate the outer radius of the ball.

    B. Calculate the radius of the cavity

    2. Relevant equations
    Buoyant Force = density of fluid * Volume of object *g

    3. The attempt at a solution
  2. jcsd
  3. Nov 15, 2007 #2

    Shooting Star

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    If the ball barely floats in water, then it's effective density must be vey nearly equal to water. So, equate the mass of the ball to the buoyant force. Also, vol of water = vol of the ball.
  4. Nov 15, 2007 #3

    Shooting Star

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    You'll need the density of Al.
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