Can Dark Matter and Black Holes be Associated in Earth's Rotation?

[OmCheeto]

Thanks OmCheeto
But going back to my question, the thought that jumped into my mind, was affecting the speed of Earth's rotation in archseconds, not bringing it to a stop.
As silly as that site is, it was in the first steps of my learning something new, that i have never given any real thought to before ( i'll not bore anyone with the thought of how to put an affect into play)
But again thanks for your answer.

You didn't have the Indonesian earthquake of 2004 in mind did you?
I was also curious why it had an effect on the Earth's rotation.

They have what seems to be a satisfactory explanation here:

http://www.uwgb.edu/DutchS/PLATETEC/RotationQk2004.HTM
The 2004 Indonesian Earthquake and Earth's Rotation

Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay
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change in length of day: -2.676 microseconds
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How exactly did the earthquake change the Earth's rotation speed? It seems to have done so because the earthquake involved plate convergence, and effectively reduced the Earth's equatorial circumference by a few millimeters while pushing denser material into the earth, like an ice skater pulling in her arms. That would also reduce the Earth's equatorial radius a fraction of a millimeter. The overall fault slip was 10-20 meters, but some of that was directed north-south, so the east-west compression was smaller.
...

 

[DaveC426913]

That website is not only silly, it is wrong. Following their instructions won't change the Earth's rotation rate one bit. There will be a slight change (very slight!) in the Earth's rotation rate when the car accelerates. The car will not change the rotation rate one bit while the car is driving at a constant velocity. Eventually the car comes to a stop. This also changes the Earth's rotation rate, and the change is exactly opposed to the initial change. End result: zero change.

At first I was going to question your conclusion that the stopping of the vehicle would provide an accelerative force. I had to re-read to see that they are, indeed, using the brakes to stop. It seemed to me the idea had some merit if they allowed the vehicle to roll to a stop by friction.

But no, it doesn't matter. Friction is still a force opposing the rotation. To be otherwise would mean you could grab a merry-go-round and come up to speed without the merry-go-round slowing down.

 

[D H]

People could change the Earth's rotation rate by driving a lot of cars to the tops of mountains and leaving them there. This would change the Earth's rotation rate for the exact same reason that the Java earthquake changed the Earth's rotation rate. To conserve angular momentum, the rotation rate must decrease if the inertia tensor is increased.

 

[OmCheeto]

People could change the Earth's rotation rate by driving a lot of cars to the tops of mountains and leaving them there. This would change the Earth's rotation rate for the exact same reason that the Java earthquake changed the Earth's rotation rate. To conserve angular momentum, the rotation rate must decrease if the inertia tensor is increased.

I think a more practical way to do it would be to pump the Earth's mantle up a space elevator and let it solidify into a Dyson ring. hmmmmm... might increase the plate tectonic activity for a while. could be deadly to all life on earth. hmmm... Why do we want to change the Earth's rotation?

 

[RonL]

Here's some good information, helps me a little.
Tiny changes can produce drastic results, we need special instruments to measure some changes.
Now for something very visual, watch the rear wheels of a dragster when the starting light turns green, spin rate really makes a difference.
If climate change is caused by a slowing of Earth's rotational speed, my question would be, (can), and how much rocket force, would produce an increase of any magnitude, if they were placed at proper angles and spaced around the globe at maximum elevations, and fired at the same time. I can't do the math (yet) but i do believe that thoughts like this can lead to some thoughts that might prove worthwhile.

http://www.nasa.gov/home/hqnews/2005/jan/HQ_05011_earthquake.html

 

[DaveC426913]

I think a more practical way to do it would be to pump the Earth's mantle up a space elevator and let it solidify into a Dyson ring.

This would be a tad moe difficult for citizen participation.

Which also answers your other question:

Why do we want to change the Earth's rotation?

Because it's a cheap and fun way to spend a Sunday afternoon!