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Joined: Apr 2007
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Quote:
Take a bucket of water and spin it around, water stays in the bucket. Why? Centrifical force, not gravity. What's the difference?


Well, for one thing, we are standing on the OUTSIDE of the earth. Try spinning your bucket so the opening is on the outside and see how much water stays in.

It's one thing to deny evolution, but denying gravity? Even the Inquisition has never done that.

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Wolf
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Quote:
Take a bucket of water and spin it around, water stays in the bucket. Why? Centrifical force, not gravity. What's the difference?


Gravity acts unless bucket is at 90degrees from vertical line. This is simple vector analysis.

Centrifugal force comes because of rotating motion.

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Originally Posted By: cdmohatta
Centrifugal force comes because of rotating motion.


Doesn't the earth rotate?

Originally Posted By: cdmohatta
can we get serious with what i posted?
Is the world real?
or it is our imagination?
For a dead person there is no world!


Originally Posted By: cdmohatta
Because the world has been called a product of our imagination. Right?


Originally Posted By: cdmohatta
there is some sense in this. The world is in our imagination.


CD, you tell me that spinning a bucket is simple vector analysis and you think the world is our imagination. You can see, feel, smell and hear the world. That is simple reality.

Last edited by amadeus1220; 07/13/07 05:25 PM.

Vance Rowe
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Jellyfish
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Quote:
Originally Posted By: cdmohatta
Centrifugal force comes because of rotating motion.


Doesn't the earth rotate?


OK, some grade-school physics here.

Centrifugal force (a force pushing outward from a rotating object) is an illusion. It does not exist. It is an expression of inertia.

What does exist is centripetal force, that is a force that pushes inwards towards the center. Inertia is the tendency for a moving object to continue moving in a straight line. Centripetal force exerted through a medium such as a car seat, or the bottom of a bucket, alters your motion from a striaght line to a curve. This force pressing on you is the equvalent feeling of you pressing on it, thus the illusion of "centrifugal" force.

Now in the case of the earth, there is no appreciable centripetal force, since there isn't a good medium to transfer it. Thus you will weigh less on a rotating earth than one that is standing still, and you will weigh less at the equator than at one of the poles.


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Wolf
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The gravity between earth and sun?

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Once upon a time, I, Chuang Chou, dreamt I was a butterfly, fluttering hither and thither, to all intents and purposes a butterfly. I was conscious only of my happiness as a butterfly, unaware that I was Chou. Soon I awaked, and there I was, veritably myself again. Now I do not know whether I was then a man dreaming I was a butterfly, or whether I am now a butterfly, dreaming I am a man.


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