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Homework Help: Determine the density of a planet in SI units

  1. Apr 24, 2012 #1
    1. The problem statement, all variables and given/known data
    Determine the density of fictional planet in SI units from the information

    2. Relevant equations
    Planets mass 1.28x10^22 Kg divided by radius 1.12x10^3Km = 1.14x10^25 Kg/m3

    3. The attempt at a solution
    My answer seems all wrong, the SI unit should be in Kg/m cubed. Is radius equal to the volume as I feel that this is where the calculation went wrong, or maybe what I have got is right.
  2. jcsd
  3. Apr 24, 2012 #2


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    welcome to pf!

    hi surfingian! welcome to pf! :smile:

    density is per volume :wink:
  4. Apr 24, 2012 #3
    The radius is not the volume. ##Volume=\frac{4}{3} \pi r^3##
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