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Re: Newton not entirely right

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Dne 29/09/2015 v 03:32 Peter Riedt napsal(a):
> On Tuesday, September 29, 2015 at 12:09:54 AM UTC+8, Odd Bodkin wrote:
>> On 9/28/2015 1:26 AM, Peter Riedt wrote:
>>>
>>> Newton's law of universal gravitation is incomplete. It considers gravity a force of attraction
>>> but it does not account for celestial bodies that cannot complete the descent to their primary.
>>
>> Orbiting bodies would not follow ellipses if they weren't attracted. 
>> They would travel in straight lines. Attraction doesn't require that the 
>> two bodies end up in contact. What makes you think they would?
>>
>>
>> -- 
>> Odd Bodkin --- maker of fine toys, tools, tables
> 
> It would be nice if there was a precise explanation and formula at what point
> a descent changes into an ellipse instead of an impact and how bodies of different mass acquire the different velocities required to keep them at different distances from the sun.
> 
Formulas of an ellipse, parabola and hyperbola are well known,
being solution of differential equation
based on gravitation law.

Type of the curve and its parameters depends on
( potential + kinetic energy ) / mass ratio,
(ellipse for negative, hyperbole for positive, parabola for zero )
the initial velocity and position.

Impact occurs for any of these curves,
when perihelium of the curve lays below the Sun surface.

I.e. when the minimum distance of the curve
to its focus point is smaller than the Sun radius.

-- 
Poutnik ( the Czech word for a wanderer )

Knowledge makes great men humble, but small men arrogant.

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Newton not entirely right Peter Riedt <riedt1@yahoo.co.uk> - 2015-09-27 23:26 -0700
  Re: Newton not entirely right Dirk Van de moortel <dirkvandemoortel@hotspam.not> - 2015-09-28 16:00 +0200
    Re: Newton not entirely right kefischer <emoneyjoe@iglou.com> - 2015-09-28 11:49 -0400
      Re: Newton not entirely right mlwozniak@wp.pl - 2015-09-29 01:13 -0700
        Re: Newton not entirely right kefischer <emoneyjoe@iglou.com> - 2015-09-29 14:48 -0400
          Re: Newton not entirely right pnalsing@gmail.com - 2015-09-29 13:19 -0700
            Re: Newton not entirely right kefischer <emoneyjoe@iglou.com> - 2015-09-29 16:56 -0400
              Re: Newton not entirely right pnalsing@gmail.com - 2015-09-29 14:06 -0700
                Re: Newton not entirely right kefischer <emoneyjoe@iglou.com> - 2015-09-29 17:43 -0400
                Re: Newton not entirely right Kent Beeler <kenbee@jefffast.au> - 2015-09-29 21:59 +0000
                Re: Newton not entirely right pnalsing@gmail.com - 2015-09-29 15:39 -0700
                Re: Newton not entirely right kefischer <emoneyjoe@iglou.com> - 2015-09-29 19:44 -0400
                Re: Newton not entirely right pnalsing@gmail.com - 2015-09-29 19:37 -0700
                Re: Newton not entirely right kefischer <emoneyjoe@iglou.com> - 2015-09-30 00:27 -0400
                Re: Newton not entirely right pnalsing@gmail.com - 2015-09-29 21:42 -0700
                Re: Newton not entirely right kefischer <emoneyjoe@iglou.com> - 2015-09-30 02:57 -0400
                Re: Newton not entirely right pnalsing@gmail.com - 2015-09-29 21:44 -0700
                Re: Newton not entirely right kefischer <emoneyjoe@iglou.com> - 2015-09-30 02:58 -0400
                Re: Newton not entirely right Odd Bodkin <bodkinodd@gmail.com> - 2015-09-30 07:56 -0500
                Re: Newton not entirely right Odd Bodkin <bodkinodd@gmail.com> - 2015-09-30 07:32 -0500
          Re: Newton not entirely right mlwozniak@wp.pl - 2015-09-29 22:45 -0700
  Re: Newton not entirely right Odd Bodkin <bodkinodd@gmail.com> - 2015-09-28 11:09 -0500
    Re: Newton not entirely right Peter Riedt <riedt1@yahoo.co.uk> - 2015-09-28 18:32 -0700
      Re: Newton not entirely right kefischer <emoneyjoe@iglou.com> - 2015-09-28 21:57 -0400
        Re: Newton not entirely right Peter Riedt <riedt1@yahoo.co.uk> - 2015-09-28 19:39 -0700
          Re: Newton not entirely right Gary Harnagel <hitlong@yahoo.com> - 2015-09-28 20:10 -0700
      Re: Newton not entirely right Poutnik <poutnik4nntp@gmail.com> - 2015-09-29 07:07 +0200
        Re: Newton not entirely right Peter Riedt <riedt1@yahoo.co.uk> - 2015-09-28 22:51 -0700
          Re: Newton not entirely right Poutnik <poutnik4nntp@gmail.com> - 2015-09-29 08:20 +0200
      Re: Newton not entirely right Sylvia Else <sylvia@not.at.this.address> - 2015-09-29 16:32 +1000
      Re: Newton not entirely right Helmut Wabnig <hwabnig@.- --- -.dotat> - 2015-09-29 09:51 +0200
      Re: Newton not entirely right Odd Bodkin <bodkinodd@gmail.com> - 2015-09-29 07:38 -0500

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