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mechanics help? (newton's shell theorem)

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    hi so i'm stuck on part c of this question, it's not related to the other questions so i only screenshotted part c.

    I just can't understand how the theorem can be applied to a scenario involving the earth as the earth isn't a hollow shell?

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    (Original post by Alex621)
    hi so i'm stuck on part c of this question, it's not related to the other questions so i only screenshotted part c.

    I just can't understand how the theorem can be applied to a scenario involving the earth as the earth isn't a hollow shell?

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Views: 24
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    You can consider the earth to be made up of an infinite number of hollow spherical shells though and since they all have the centre at the exact same point, you can model the entire mass as being concentrated there.
 
 
 
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