Gravitation: Uneven Core Densities Physics help please!!!?

Tony

New member
One geological model for a distant planet has a shell of depth R and mass 4M surrounding a core of radius R and mass of M. Make M = 4.3 X 1024 kg and R = 6.4 X 106 m. .
a)What is the acceleration due to gravity a distance R from the center of this planet?
m/sec2

b)What is the acceleration due to gravity a distance 3R from the center of this planet?
m/sec2

c)What is the acceleration due to gravity a distance 5R from the center of this planet?
m/sec2
 
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