Correct exaggerated drawing of tides

  • Thread starter twain
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  • #1
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Hi. Some books explain tides as a result of the gravitational pull of the moon with an exaggerated drawing like A below.

It seems to me that A is not correct, but B and C are more like it. Because the moon pulls all water towards it, not just one side.

Which is correct and WHY?
 

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  • #2
D H
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A is correct.
 
  • #3
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Check here for a discussion:
http://en.wikipedia.org/wiki/Tide

You can also try "tidal effects" in general relativity, but thatmay be more complex a discussion.
 
  • #4
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That seems a long read. Where does it say A is correct?
 
  • #5
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Let me just rephrase the question: Is the radius of the ocean the same on both sides and WHY?
 
  • #6
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That seems a long read. Where does it say A is correct?
Anyone who can't be bothered to read through relatively short passages like the wiki referred to would be best advised to try a non technical subject instead.

I scrolled down the wiki and within the first 15% came across a diagram, identical to A with a simple and easy explanation attached.

What more do you want?
 
  • #7
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I scrolled down the wiki
In other words you did not READ the wiki, thank you for agreeing with me that it is too long a read.

What more do you want?
I do not see the answer to the following below.

Is the radius of the ocean the same on both sides and WHY?
Having now read the whole part about that diagram, it does not give a reason why the equipotential surface of the tidal force should have two bulges. Let alone two bulges of equal height from the center.
 
  • #8
Cleonis
Gold Member
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Check here for a discussion:
http://en.wikipedia.org/wiki/Tide
Having now read the whole part about that diagram, it does not give a reason why the equipotential surface of the tidal force should have two bulges. Let alone two bulges of equal height from the center.
I agree that the wikipedia article about 'tide' does not offer explanation for the fact that planetary tidal effects give rise to two tidal bulges, on opposite sides of the planet.

However, there is also the wikipedia article about 'tidal force'.
The page with the two-panel diagram http://en.wikipedia.org/wiki/File:Tidal-forces.png" [Broken] specifically explains the dual bulge.
 
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