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  4. Do gravitational waves propagate faster than light waves?
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Do gravitational waves propagate faster than light waves?

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Offline Bill S

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Re: Do gravitational waves propagate faster than light waves?
« Reply #80 on: 11/01/2011 19:30:48 »
Quote from: JP
“There is no additional force required to create or maintain the bending”……… “Causing the distortion in the first place would require energy”.

Is it me, or is there a contradiction here?   [???]
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Offline Geezer

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Re: Do gravitational waves propagate faster than light waves?
« Reply #81 on: 11/01/2011 21:47:48 »
Quote from: Bill S on 11/01/2011 19:30:48
Quote from: JP
“There is no additional force required to create or maintain the bending”……… “Causing the distortion in the first place would require energy”.

Is it me, or is there a contradiction here?   [???]

I don't see a contrdiction.  For example, it required energy to put the Moon in orbit around the Earth (possibly as the result of a collision with another large object) but once the Moon began to orbit the Earth, regardless of the model you choose, no additional energy or force is required.

The graviational effect is similar to a piece of string that connects the two objects.

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Offline Bill S

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Do gravitational waves propagate faster than light waves?
« Reply #82 on: 12/01/2011 01:38:54 »
Let's focus in a little.

"no additional force required to create...the bending"

"Causing the distortion in the first place would require energy"

Still no contradiction?   It's late at night, I might not be thinking straight.   [:P] 
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Do gravitational waves propagate faster than light waves?
« Reply #83 on: 12/01/2011 02:02:01 »
My point was this:

You need to put a mass there to create the bending initially.  E=mc2, so that matter is energy.  Therefore you need energy to create the bending.  But that mass is all the energy you need (if we assume you somehow created the mass from energy at that point, so you didn't need to push it there).

Once the mass is there no further energy needs to be put in and the bending will stay forever.
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