Rank the following hypothetical planets -- all of which have the same total mass and same radius -- from lowest moment of inertia to highest moment of inertia:

Question

1) A uniform sphere of mixed up rock and iron
2) A rocky planet with an iron core
3) A rocky planet with an iron crust
4) A uranium planet with a thick atmosphere (where the radius is measured to the top of the atmosphere)

Answer 1

1,2,3,4

Answer 2

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