Groups > sci.physics.relativity > #463342

Re: Why does gravity have to be transmitted through particles when gravity isn't a force in general relativity?

From	Odd Bodkin <bodkinodd@gmail.com>
Newsgroups	sci.physics.relativity
Subject	Re: Why does gravity have to be transmitted through particles when gravity isn't a force in general relativity?
Date	2018-07-03 15:32 +0000
Organization	Aioe.org NNTP Server
Message-ID	<phg4um$18mf$2@gioia.aioe.org> (permalink)
References	(12 earlier) <2453edc1-1cb6-42e2-b8f4-522e5d958bbe@googlegroups.com> <80150b33-e00c-4e62-b18a-0c0289842f72@googlegroups.com> <74a04d05-3f88-4afe-8c93-292a9d1f09dc@googlegroups.com> <1942464e-69bf-4ae6-9522-f84774758d65@googlegroups.com> <f417a53c-621e-4234-a215-b452efe01bf7@googlegroups.com>

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Prokaryotic Caspase Homolog <prokaryotic.caspase.homolog@gmail.com> wrote:
> On Tuesday, July 3, 2018 at 8:45:40 AM UTC-5, kenseto wrote:
>> On Monday, July 2, 2018 at 7:10:18 PM UTC-4, Prokaryotic Caspase Homolog wrote:
>>> On Monday, July 2, 2018 at 5:50:44 PM UTC-5, kenseto wrote:
>>>> On Monday, July 2, 2018 at 2:30:59 PM UTC-4, Prokaryotic Caspase Homolog wrote:
>>>>> On Monday, July 2, 2018 at 1:05:43 PM UTC-5, kenseto wrote:
>>> 
>>>>>> How is your experiment demonstrates that a single force of
>>>>>> attractive gravity can make the moon to have stable orbit around the earth?
>>>>> 
>>>>> It will demonstrate that the attractive force of a magnet can support
>>>>> stable orbits, despite your claim of June 18.
>>>>> https://groups.google.com/d/msg/sci.physics.relativity/A_X409P-bz0/w24-oVmHBQAJ 
>>>>> 
>>>>> The pendulum line substitutes for a smooth, nearly frictionless table.
>>>> 
>>>> No the heavy pendulum have momentum. That’s why the heavy pendulum at
>>>> the university can swing back and forth without loosing any momentum.
>>>> It is likely hat the magnet have little or no effect on your experiment.
>>> 
>>> You misread my answer. By "pendulum line", I meant the strand of fishing
>>> line that will support the pendulum bob.
>> 
>> I didn’t misread your answer. The pendulum bob at the university is
>> supported by a long thin steel line.
>> 
>>> 
>>> The pendulum line will substitute for an almost flat, nearly frictionless
>>> table by restricting the motions of the pendulum bob to a section of a 
>>> very shallow sphere.
>> 
>> No, the pendulum bob’s momentum will allow it to maintain its
>> motion.....so it is not due to the attractive force of the center magnet.
> 
> You forget that I have ***MEASURED*** the attractive force of the magnet 
> at different distances.
> 
> Because of the roughly inverse fifth power fall-off of magnetic attraction
> versus distance, I know that I will have to work at close distances for
> the force of magnetic attraction to dominate over gravitation, even with
> a 5 meter fishing line. Using a magnet poking through the table arrangement
> and a 1 kg weight, the force of magnetic attraction at 5 cm will be 3 times
> that of the radial force of gravity. Using the stacked washers alone,
> magnetic attraction at that distance will be 35 times that of gravity. 
> 
> The magnets underneath arrangement does not allow as much magnetic 
> attraction, but I can work with arbitrarily small orbital radii, and the
> pendulum radial attractive force ***goes down*** with decreasing radius.
> 
> Plus, I can perform measurements both ***with and without*** the magnets. 
> I presume that you know about "controlled experiments"? Or maybe you don't.   
> 
> There is no way that I can freehand launch pendulums with sufficient 
> accuracy to achieve reproducible results, so I will be building calibrated
> rubber band slingshots over the July 4 holiday.
> 
> I just finished this morning drilling an acrylic sheet for the magnet poking
> through the table arrangement. I haven't removed the protective facing
> plastic, accounting for the frosted appearance. But it will be clear after
> I remove the facing sheets. There is one magnet poking above the sheet
> resting on a spacer, and three magnets below the sheet.
> https://drive.google.com/open?id=1T17gNN-BNUqwtDROBC7VkwtcjULfF1n1
> 
> Another thing that I need to build is an open table to lay the sheet on so
> that I can photograph from below. Since the sheet is only 18" x 24", the
> legs of the table will need to be splayed out for me to crawl in and out
> easily without fear of knocking into one of the legs. I have a fair amount
> of waste wood in the garage. I won't have to spend much on new lumber.
>   _____
>  /     \
> /  -o-  \  (me underneath the table)
> 
> Unfortunately, building the table will test my woodworking skills to the
> limit. Up to now, my woodworking has been limited to regularly replacing
> sections of fence that have gotten rotten over the years and/or blown down
> by thunderstorm winds. 
> 
> I don't know if I will want to post a photograph of my table. We have
> a professional woodworker here who might have some mean things to say of
> my amateur efforts... :-)
> 

Don’t splay the legs. It makes the whole thing harder. Make a table wide
enough the you can fit comfortably between the legs. I presume that you
will have an open box frame at the top that is perhaps 36”x24”. Then just
put in a couple of joists 24” long spaced 18” apart. This is small enough
that 2x4s will make it plenty stiff, and you can buy rubber 2x4 caps for
about 75 cents each to make nonslip feet. This will consume three 8’ 2x4
boards and take about 20 minutes to hammer together. 

-- 
Odd Bodkin — Maker of fine toys, tools, tables

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