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Gravity anomalies



 
 
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  #1  
Old September 29th 03 posted to sci.physics
Cyrrex
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Posts: 5
Default Gravity anomalies

I have heard somewere that certain swiss lakes generates anomalous
gravity effects.Someone knows the names of these lakes?
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  #2  
Old September 29th 03 posted to sci.physics
Uncle Al
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Posts: 17,007
Default Gravity anomalies

Cyrrex wrote:

I have heard somewere that certain swiss lakes generates anomalous
gravity effects.Someone knows the names of these lakes?


There are zero gravity anomalies anywhere on Earth. The best you can
hope for is optical illusions and outright lies.

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
"Quis custodiet ipsos custodes?" The Net!
  #3  
Old September 29th 03 posted to sci.physics
Robert J. Kolker
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Posts: 1,291
Default Gravity anomalies



Uncle Al wrote:


There are zero gravity anomalies anywhere on Earth. The best you can
hope for is optical illusions and outright lies.


What is meant by the term gravity anomalies?

If you drop a plumb bob while standing next to Mt. Everest the plumb bob
does not point exactly to earth center. Mt. Everest exerts enough of a
pull on the bob so the direction of the plumb line is affected.

Bob Kolker


  #4  
Old September 29th 03 posted to sci.physics
Jamieson Christie
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Posts: 8
Default Gravity anomalies


There are zero gravity anomalies anywhere on Earth. The best you can
hope for is optical illusions and outright lies.


What is meant by the term gravity anomalies?

If you drop a plumb bob while standing next to Mt. Everest the plumb bob
does not point exactly to earth center. Mt. Everest exerts enough of a
pull on the bob so the direction of the plumb line is affected.


Even if you're not standing next to a mountain, the Coriolis force will
push the bob away from pointing to the centre of mass.

--
Jamieson Christie
  #5  
Old September 29th 03 posted to sci.physics
John C. Polasek
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Posts: 2,224
Default Gravity anomalies

On Mon, 29 Sep 2003 13:42:26 +0100, Jamieson Christie
wrote:


There are zero gravity anomalies anywhere on Earth. The best you can
hope for is optical illusions and outright lies.


What is meant by the term gravity anomalies?

If you drop a plumb bob while standing next to Mt. Everest the plumb bob
does not point exactly to earth center. Mt. Everest exerts enough of a
pull on the bob so the direction of the plumb line is affected.


Even if you're not standing next to a mountain, the Coriolis force will
push the bob away from pointing to the centre of mass.

--
Jamieson Christie

You need to be moving to get a Coriolus force.
  #6  
Old September 29th 03 posted to sci.physics
Jamieson Christie
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Posts: 8
Default Gravity anomalies

John C. Polasek wrote:

You need to be moving to get a Coriolus force.


Doh! I'm confusing this with something else. Sorry.
  #7  
Old September 29th 03 posted to sci.physics
meron@cars3.uchicago.edu
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Posts: 401
Default Gravity anomalies

In article , Jamieson Christie writes:

There are zero gravity anomalies anywhere on Earth. The best you can
hope for is optical illusions and outright lies.


What is meant by the term gravity anomalies?

If you drop a plumb bob while standing next to Mt. Everest the plumb bob
does not point exactly to earth center. Mt. Everest exerts enough of a
pull on the bob so the direction of the plumb line is affected.


Even if you're not standing next to a mountain, the Coriolis force will
push the bob away from pointing to the centre of mass.

No, the coriolis force will do nothing of the sort. It is only acting
on moving (relative to Earth) objects,thus it cannot change the
equilibrium point. On the other hand the centrifugal force will
indeed, in general, change the direction of the bob. None of this,
however, has anything to do with any "gravitational anomalies".

Mati Meron | "When you argue with a fool,
| chances are he is doing just the same"
  #8  
Old September 29th 03 posted to sci.physics
Robert J. Kolker
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Posts: 1,291
Default Gravity anomalies



Jamieson Christie wrote:
Even if you're not standing next to a mountain, the Coriolis force will
push the bob away from pointing to the centre of mass.


Even after correction is made for for force related to the rotation of
the earth, the plumb bob is still not pointing straight down. The
mountain is pulling on the plumb bob.

Bob Kolker

  #10  
Old September 29th 03 posted to sci.physics
pstowe{Blues}@ix.netcom.com
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Posts: 267
Default Gravity anomalies

On Mon, 29 Sep 2003 17:47:36 -0400, "Robert J. Kolker"
wrote:



Jamieson Christie wrote:
Even if you're not standing next to a mountain, the Coriolis force will
push the bob away from pointing to the centre of mass.


Even after correction is made for for force related to the rotation of
the earth, the plumb bob is still not pointing straight down. The
mountain is pulling on the plumb bob.


Semantics here are important..., the mountain is influencing the plum
bob. The mountain 'pulls' nothing...

Paul Stowe
 




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