Groups > sci.physics.relativity > #407558

Re: Apollo 11

Message-ID	<5892C52C.325F@ix.netcom.com> (permalink)
Date	2017-02-01 21:35 -0800
From	The Starmaker <starmaker@ix.netcom.com>
Newsgroups	sci.physics.relativity
Subject	Re: Apollo 11
References	<39391af7-5bea-4ba2-99cf-4448ebb67f5b@googlegroups.com> <e9888588-cef5-44e6-b184-66ee8e071c1b@googlegroups.com>

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numbernumber1964@gmail.com wrote:
> 
> Sylvia,
> 
> http://curious.astro.cornell.edu/about-us/37-our-solar-system/the-moon/the-moon-and-the-earth/28-how-do-we-know-the-mass-of-the-earth-and-the-moon-advanced
> 
> Once you know Fgrav/m, G, and R, you can rearrange equation (1):
> 
> M = (R2)*Fgrav / G*m
> 
> where M is the mass of the Earth, and plug in the numbers.
> 
> If you did not know G beforehand, you would need to determine it experimentally. The simplest way to do this is through the Cavendish experiment, in which a torsion balance is used to measure the attraction between pairs of lead weights. It actually works, too!
> 
> The Moon is a much trickier problem. The trouble is, that since in both equations (1) and (2) m appears in the same relation to F, it's not possible to use just those two equations to solve for m (the body being accelerated. Try it! The acceleration just doesn't depend on the mass of the accelerated body.). You can estimate it roughly by assuming that the Moon is just as dense as the Earth and then scaling the mass of the Earth down to the volume of the Moon:
> 
> Mmoon ~ (Vmoon/Vearth)*Mearth


"the Moon is just as dense as the Earth"????


i heard somewhere that when they landed on the moon it made the sound of
a bell...
like if it was hollow or something..

but i don't know if it is true.

Thread

Apollo 11 numbernumber1964@gmail.com - 2017-01-27 10:57 -0800
  Re: Apollo 11 JanPB <filmart@gmail.com> - 2017-01-27 16:05 -0800
    Re: Apollo 11 Juliana Auerbach <jaot@tognaenn.org> - 2017-01-28 00:18 +0000
      Re: Apollo 11 JanPB <filmart@gmail.com> - 2017-01-27 16:41 -0800
        Re: Apollo 11 Juliana Auerbach <jaot@tognaenn.org> - 2017-01-28 01:14 +0000
          Re: Apollo 11 JanPB <filmart@gmail.com> - 2017-01-28 11:33 -0800
            Re: Apollo 11 Juliana Auerbach <jaot@tognaenn.org> - 2017-01-28 20:22 +0000
          Re: Apollo 11 JanPB <filmart@gmail.com> - 2017-01-28 11:34 -0800
            Re: Apollo 11 Juliana Auerbach <jaot@tognaenn.org> - 2017-01-28 20:19 +0000
              Re: Apollo 11 JanPB <filmart@gmail.com> - 2017-01-28 17:21 -0800
                Re: Apollo 11 Juanita Forney <iatiet@oetnnrn.org> - 2017-01-30 12:33 +0000
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-01-27 16:46 -0800
  Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-01-28 12:48 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-01-28 13:16 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-01-29 13:04 +1100
    Re: Apollo 11 John Gogo <jfgogo22@yahoo.com> - 2017-02-10 17:08 -0800
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-01-28 13:24 -0800
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-01-28 13:34 -0800
  Re: Apollo 11 Thomas Heger <ttt_heg@web.de> - 2017-01-29 07:36 +0100
    Re: Apollo 11 Gary Harnagel <hitlong@yahoo.com> - 2017-01-29 03:20 -0800
      Re: Apollo 11 Thomas Heger <ttt_heg@web.de> - 2017-01-29 20:16 +0100
        Re: Apollo 11 Gary Harnagel <hitlong@yahoo.com> - 2017-01-29 12:07 -0800
          Re: Apollo 11 Thomas Heger <ttt_heg@web.de> - 2017-02-01 06:24 +0100
        Re: Apollo 11 "Paul B. Andersen" <relativity@paulba.no> - 2017-01-29 22:43 +0100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-01-29 12:05 -0800
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-01-29 15:27 -0800
    Re: Apollo 11 Gary Harnagel <hitlong@yahoo.com> - 2017-01-29 15:40 -0800
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-01-30 12:37 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-01-31 11:18 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-01-30 15:58 -0800
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-01-30 16:18 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-01-31 11:22 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-01-30 16:42 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-01-31 12:13 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-01-31 10:01 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-01 12:14 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-01-31 14:51 -0800
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-01 12:24 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-02 12:11 +1100
    Re: Apollo 11 The Starmaker <starmaker@ix.netcom.com> - 2017-02-01 21:35 -0800
      Re: Apollo 11 "David (Lord Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2017-02-01 22:05 -0800
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-01 15:39 -0800
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-02 11:37 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-03 09:40 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-02 15:22 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-03 11:52 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-03 11:55 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-04 11:44 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-03 15:25 -0800
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-04 12:49 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-05 12:07 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-05 12:16 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-06 08:35 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-06 11:49 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-07 10:58 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-07 13:32 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-08 12:49 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-08 11:13 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-09 12:34 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-09 11:11 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-10 10:53 +1100
    Re: Apollo 11 The Starmaker <starmaker@ix.netcom.com> - 2017-02-12 11:09 -0800
      Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-13 11:52 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-10 11:01 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-11 11:42 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-11 11:21 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-12 12:00 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-12 11:44 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-13 11:51 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-12 13:43 -0800
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-13 10:23 -0800
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-14 09:54 -0800
    Re: Apollo 11 Sylvia Else <sylvia@not.at.this.address> - 2017-02-15 14:26 +1100
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-14 10:49 -0800
  Re: Apollo 11 numbernumber1964@gmail.com - 2017-02-14 10:52 -0800

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