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Homework Help: Density of sphere

  1. Mar 19, 2010 #1
    1. The problem statement, all variables and given/known data

    1.express the volume in terms of the diameter d of the sphere
    2.write an equation to find the density of the sphere in terms of mass M and diameter d

    2. Relevant equations

    sphere Volume = 4 x pi x r^3 / 3
    density = mass/volume


    3. The attempt at a solution

    1. d=2r so V = d^3 x pi / 6
    2. density = M / V(=d^3 x pi /6) = 6M/pi x d^3



    but my teacher said it is wrong. what is wrong with my answer?
     
  2. jcsd
  3. Mar 19, 2010 #2

    Filip Larsen

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    Gold Member

    Assuming you had density written up in your answer like [itex]\frac{6M}{\pi d^3}[/itex] or similar (in the post above you missed some parenthesis) in I don't see anything wrong.
     
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