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1

I don't have the book, so I can only speculate on what the authors are suggesting. My interpretation is that if you consider a frame accelerating with the lower particle then the acceleration of the upper particle relative to the lower particle throughout the fall is approximately given by: $$\Delta a \approx \frac{dg}{dr} \Delta r$$ where the ...

-2

I think the moon and sun do affect the weather more than we are led to believe, the moon is getting farther away and the sun is getting larger, these both must have an impact on earth. The suns solar flares and mass corona ejections also play a part. I believe small changes in the moons orbit and distance and the suns swelling has a bigger impact on the ...

6

When an object comes within the Roche limit, it breaks up because of tidal stresses - the part closest to the earth feels a stronger gravitational attraction than the furthest part. Hence, the closest part will fall a little faster than the trailing parts. As a result, "disintegration" does not mean that the body will fly apart like a bomb. Instead, it ...

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