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Gravitational Acceleration (Gauss law)

  1. Apr 22, 2012 #1
    1. The problem statement, all variables and given/known data
    35l8ei8.jpg


    2. Relevant equations

    Just to clarify the question, the value given for R2 is the overall radius of Earth, it isn't R1-R2. (At least, that's my interpretation given that the R2 value is approx. the Earth's radius)

    3. The attempt at a solution

    Don't really know how to go about it, the approach I've tried is to use the given densities and volumes (from the radii) to find the mass of the core and the mantle. Added the masses (it computes to half the Earth's mass ) and then used
    g = GM/(R^2).

    I'm getting g = 4.1 for part i)

    All help would be much appreciated!

    Thanks :)
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 22, 2012 #2
    at least show me your problem
     
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