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Buoyance of an object

  1. Jun 10, 2009 #1
    1. The problem statement, all variables and given/known data

    A 7.56 cm diameter sphere with a mass of 137.1 g is neutrally buoyant in a liquid. What is the density of the liquid?

    2. Relevant equations

    B-mg=0
    B=V*density*g

    3. The attempt at a solution

    B=mg
    V*density*g=mg
    denisty=M/V
    denisty= .1371 kg/(4/3*PI*r^2) because its a sphere

    What am I doing wrong?
     
  2. jcsd
  3. Jun 10, 2009 #2
    any ideas? It seems easy but it is not turning out correct.
     
  4. Jun 10, 2009 #3

    Doc Al

    User Avatar

    Staff: Mentor

    Double-check that volume formula.
     
  5. Jun 10, 2009 #4
    Last edited by a moderator: Apr 24, 2017
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