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Groups > sci.physics > #610855
| From | Sylvia Else <sylvia@not.at.this.address> |
|---|---|
| Newsgroups | sci.physics |
| Subject | Re: Calculating G |
| Date | 2016-12-30 21:43 +1100 |
| Message-ID | <ecms2rFflm7U1@mid.individual.net> (permalink) |
| References | <adbb9ff0-c60d-49d8-bb55-b114c60dc8c0@googlegroups.com> <ecjobeFn4dqU1@mid.individual.net> <fce81be3-6fca-46cb-8418-c11f5855e2f6@googlegroups.com> <eclunfF9711U2@mid.individual.net> <359717ca-d507-47fe-8486-2fa8086b049f@googlegroups.com> |
On 30/12/2016 8:11 PM, Peter Riedt wrote: > On Friday, December 30, 2016 at 10:22:43 AM UTC+8, Sylvia Else wrote: >> On 29/12/2016 11:21 PM, Peter Riedt wrote: >>> On Thursday, December 29, 2016 at 2:21:38 PM UTC+8, Sylvia Else >>> wrote: >>>> On 29/12/2016 1:13 AM, Peter Riedt wrote: >>>>> Calculating G >>>>> >>>>> The constant G was anticipated by Newton but first accurately >>>>> determined in the laboratory by Henry Cavendish in 1798. It has >>>>> the value G=6.674E-11m3kg−1s−2 (cubic meters per kilogram second >>>>> squared). >>>>> >>>>> G can be derived from elements of a star by the formula >>>>> G=gstar*rstar^2/Mstar >>>>> >>>>> gstar rstar Mstar G Sun 273.97 696,000,000 1.99E+30 >>>>> 6.674E-11 ACa 200.18 853,992,000 2.19E+30 6.674E-11 ACb 332.10 >>>>> 602,040,000 1.80E+30 6.674E-11 AC c 1695.00 98,136,000 >>>>> 2.45E+29 6.674E-11 >>>>> >>>>> gstar = surface acceleration in m/sec rstar = radius in m Mstar = >>>>> mass in kg >>>> >>>> How are you going to get the mass and surface acceleration of the >>>> star? >>>> >>>> Sylvia. >>> >>> I got the mass of the sun and Alpha Centauri A, B, C from sources >>> available on the Internet: >> >> Are you for real? How do you think they ended up on the Internet? >> >> Sylvia. > > What is your point? > The mass of the sun that's on the Internet was calculated by applying the measured value of G to the orbits of the planets. So calculating G using the mass of the sun obtained from the Internet is actually calculating G from G. The other masses are either derived similarly from orbital speeds, or are derived from brightness based on stellar physics. Surface accelerations are calculated from the mass and G and measured radius. As always, your attempts to calculate G are completely circular. There is no known way of calculating it, other than from the measured attraction between masses that are known accurately by means other than orbital mechanics. Sylvia.
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Calculating G Peter Riedt <riedt1@yahoo.co.uk> - 2016-12-28 06:13 -0800
Re: Calculating G Poutnik <poutnik4nntp@gmail.com> - 2016-12-28 15:40 +0100
Re: Calculating G Poutnik <poutnik4nntp@gmail.com> - 2016-12-28 15:41 +0100
Re: Calculating G Peter Riedt <riedt1@yahoo.co.uk> - 2016-12-28 22:10 -0800
Re: Calculating G "hanson" <hanson@quick.net> - 2016-12-28 22:29 -0800
Re: Calculating G Poutnik <poutnik4nntp@gmail.com> - 2016-12-29 08:07 +0100
Re: Calculating G Peter Riedt <riedt1@yahoo.co.uk> - 2016-12-29 16:53 -0800
Re: Calculating G Alan Folmsbee <omnilobe@gmail.com> - 2016-12-28 09:27 -0800
Re: Calculating G Sylvia Else <sylvia@not.at.this.address> - 2016-12-29 17:21 +1100
Re: Calculating G Peter Riedt <riedt1@yahoo.co.uk> - 2016-12-29 04:21 -0800
Re: Calculating G Wally W. <ww84wa@aim.com> - 2016-12-29 09:11 -0500
Re: Calculating G "hanson" <hanson@quick.net> - 2016-12-29 06:34 -0800
Re: Calculating G noTthaTguY <abu.kuanysh05@gmail.com> - 2016-12-29 15:40 -0800
Re: Calculating G Peter Riedt <riedt1@yahoo.co.uk> - 2016-12-29 16:52 -0800
Re: Calculating G Peter Riedt <riedt1@yahoo.co.uk> - 2016-12-29 16:59 -0800
Re: Calculating G Odd Bodkin <bodkinodd@gmail.com> - 2017-01-03 12:19 -0600
Re: Calculating G noTthaTguY <abu.kuanysh05@gmail.com> - 2017-01-03 12:43 -0800
Re: Calculating G Sylvia Else <sylvia@not.at.this.address> - 2016-12-30 13:22 +1100
Re: Calculating G Peter Riedt <riedt1@yahoo.co.uk> - 2016-12-30 01:11 -0800
Re: Calculating G Sylvia Else <sylvia@not.at.this.address> - 2016-12-30 21:43 +1100
Re: Calculating G "hanson" <hanson@quick.net> - 2016-12-30 06:48 -0800
Re: Calculating G Peter Riedt <riedt1@yahoo.co.uk> - 2016-12-30 14:43 -0800
Re: Calculating G Sylvia Else <sylvia@not.at.this.address> - 2016-12-31 11:35 +1100
Re: Calculating G Peter Riedt <riedt1@yahoo.co.uk> - 2016-12-30 17:06 -0800
Re: Calculating G Sylvia Else <sylvia@not.at.this.address> - 2016-12-31 12:40 +1100
Re: Calculating G Peter Riedt <riedt1@yahoo.co.uk> - 2016-12-30 23:22 -0800
Re: Calculating G Sylvia Else <sylvia@not.at.this.address> - 2016-12-31 20:28 +1100
Re: Calculating G "reber g=emc^2" <herbertglazier0@gmail.com> - 2016-12-31 11:07 -0800
Re: Calculating G "hanson" <hanson@quick.net> - 2016-12-31 11:16 -0800
Re: Calculating G "reber g=emc^2" <herbertglazier0@gmail.com> - 2016-12-31 13:22 -0800
Re: Calculating G "hanson" <hanson@quick.net> - 2016-12-31 15:36 -0800
Re: Calculating G Sylvia Else <sylvia@not.at.this.address> - 2017-01-01 11:49 +1100
Re: Calculating G Odd Bodkin <bodkinodd@gmail.com> - 2017-01-03 15:09 -0600
Re: Calculating G Peter Riedt <riedt1@yahoo.co.uk> - 2017-01-03 16:22 -0800
Re: Calculating G noTthaTguY <abu.kuanysh05@gmail.com> - 2017-01-03 16:57 -0800
Re: Calculating G Odd Bodkin <bodkinodd@gmail.com> - 2017-01-04 10:22 -0600
Re: Calculating G Peter Riedt <riedt1@yahoo.co.uk> - 2017-01-05 16:02 -0800
Re: Calculating G Odd Bodkin <bodkinodd@gmail.com> - 2017-01-06 07:09 -0600
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