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Fluids Problem help invovling floating

  1. Nov 9, 2011 #1
    1. The problem statement, all variables and given/known data
    A racquetball with a diameter of 5.6 cm and a mass of 42 g is cut in half to make a boat for American pennies made after 1982. The mass and volume of an American penny made after 1982 are 2.5 g and 0.36 cm3. How many pennies can be placed in the racquetball boat without sinking it? (The density of water is 1000 kg/m3.)



    2. Relevant equations
    FB = mobjectg


    3. The attempt at a solution
    I've tried finding the densities of both objects and equating it to 1000 to find the number of pennies, but it didn't work. What else should I do?
     
  2. jcsd
  3. Nov 9, 2011 #2

    gneill

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    Staff: Mentor

    What's the buoyant force on a racquetball submerged to half its diameter?
     
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