| Topic: |
Science > Physics |
| User: |
"Michael Lodman" |
| Date: |
08 Mar 2006 11:54:28 PM |
| Object: |
potential energy |
Stupid question: does the expanding universe create, destroy or do nothing
relative to the amount of gravitational potential energy in the "system"?
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| User: "Mac D." |
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| Title: Re: potential energy |
09 Mar 2006 03:27:03 AM |
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Michael Lodman wrote:
Stupid question: does the expanding universe create, destroy or do nothing
relative to the amount of gravitational potential energy in the "system"?
Good question, gravitational potential energy in the system is always
equal. Because the gravitational force is derived from mass, and the
amount of mass in the universe is constantly changing, the answer is
no. If mass is converted to energy, such as heat and light, then of
course that has no gravity.
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| User: "Sam Wormley" |
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| Title: Re: potential energy |
09 Mar 2006 01:38:31 PM |
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Mac D. wrote:
Michael Lodman wrote:
Stupid question: does the expanding universe create, destroy or do nothing
relative to the amount of gravitational potential energy in the "system"?
Good question, gravitational potential energy in the system is always
equal. Because the gravitational force is derived from mass, and the
amount of mass in the universe is constantly changing, the answer is
no. If mass is converted to energy, such as heat and light, then of
course that has no gravity.
Is not the total mass-energy (source of gravitation) of the universe
fixed for all time?
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| User: "Dave Lister" |
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| Title: Re: potential energy |
09 Mar 2006 02:40:59 PM |
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Sam Wormley <swormley1@mchsi.com> wrote in
news:Xu%Pf.810645$x96.782685@attbi_s72:
Mac D. wrote:
Michael Lodman wrote:
Stupid question: does the expanding universe create, destroy or do
nothing relative to the amount of gravitational potential energy in
the "system"?
Good question, gravitational potential energy in the system is always
equal. Because the gravitational force is derived from mass, and the
amount of mass in the universe is constantly changing, the answer is
no. If mass is converted to energy, such as heat and light, then of
course that has no gravity.
Is not the total mass-energy (source of gravitation) of the
universe fixed for all time?
As objects are spread out, the force between them falls, as does the
potential energy: U = -GMm/r
--
Elect a Crook - Vote Republican
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| User: "Mac D." |
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| Title: Re: potential energy |
09 Mar 2006 03:29:30 AM |
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Sorry, "gravitational potential energy in the system is always equal"
is not true. Ooops.
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