Path: csiph.com!weretis.net!feeder8.news.weretis.net!paganini.bofh.team!not-for-mail From: The Starmaker Newsgroups: sci.physics.relativity,sci.physics Subject: Re: What has stopped rotating? Date: Sat, 02 Dec 2023 11:00:38 -0800 Organization: To protect and to server Message-ID: <656B7ED6.4A7D@ix.netcom.com> References: <7d2915f4-428c-448a-840e-b5d44b269961n@googlegroups.com> <812a6a3e-048b-4ced-a7fe-2a55f36fe376n@googlegroups.com> <34c710b8-4d52-42eb-874a-74d3e1633118n@googlegroups.com> <5ad12383-78bc-4393-b69d-c040cfe1b31an@googlegroups.com> <3d42f256-a3c1-452a-a0a3-50fed470475an@googlegroups.com> <2693c1f1-0e9b-471f-acc8-76b272950f39n@googlegroups.com> Reply-To: starmaker@ix.netcom.com Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Injection-Info: paganini.bofh.team; logging-data="427658"; posting-host="nLYg9UBeoMWa070gP9wQcw.user.paganini.bofh.team"; mail-complaints-to="usenet@bofh.team"; posting-account="9dIQLXBM7WM9KzA+yjdR4A"; Cancel-Lock: sha256:BbRhJ4SuWrMCXaS1biAVWbKVP6v7NDoNx/SyrDs+gqo= X-Antivirus: Avast (VPS 231202-2, 12/02/2023), Outbound message X-Notice: Filtered by postfilter v. 0.9.3 X-Mailer: Mozilla 3.04Gold (WinNT; U) X-Antivirus-Status: Clean Xref: csiph.com sci.physics.relativity:624964 sci.physics:883246 Paul B. Andersen wrote: > > Den 02.12.2023 03:34, skrev patdolan: > > On Friday, December 1, 2023 at 4:20:14 AM UTC-8, Paul B. Andersen wrote: > >> Den 30.11.2023 21:12, skrev patdolan: > >>>> On Wednesday, 29 November 2023 at 22:51:11 UTC+1, Paul B. Andersen wrote: > >>>>> Den 28.11.2023 20:53, skrev patdolan: > >>>>>> On Tuesday, November 28, 2023 at 2:38:09 AM UTC-8, Paul B. Andersen wrote: > >>>>>>> > >>>>>>> Second challenge: > >>>>>>> A long heavy pendulum is hanging under the ISS. > >>>>>>> A stable situation is that the pendulum is always > >>>>>>> pointing towards the centre of the Earth. > >>>>>>> > >>>>>>> Which forces are acting on the pendulum mass? > >> > >>>>> > >>>>>> Neither the sun's gravitational field nor the earth's gravitational field exerts a force on the pendulum you discribe. Because the pendulum is in free fall around both. Only Mach's mysterious trans-universe space-brace field acts on the pendulum and the ISS gyroscope. > >> > >>>>> According to Newton: > >>>>> > >>>>> The gravitational force on any object with mass m is > >>>>> always GMm/r² pointing towards the centre of the Earth. > >>>>> If the object is free falling, the gravitational > >>>>> (coordinate) acceleration will be GM/r², pointing > >>>>> towards the centre of the Earth. > >>>>> > >>>>> The CG of ISS + pendulum is moving in circular orbit, > >>>>> which means that the acceleration is perpendicular to > >>>>> the velocity, so the acceleration ω²⋅r₀ is the centripetal > >>>>> acceleration which make the ISS move in circular orbit. > >>>>> The centripetal acceleration is equal to the gravitational > >>>>> acceleration: > >>>>> ω²⋅r₀ = GM/r₀² (1) > >>>>> where ω is the angular velocity off the ISS, and r₀ is the > >>>>> distance from the CG of ISS+pendulum to the centre of the Earth. > >>>>> > >>>>> Equation (1) say that an object with angular velocity ω > >>>>> must have a distance from the centre of the Earth: > >>>>> r₀ = ∛(GM/ω²) to make the centripetal acceleration equal > >>>>> to the gravitational acceleration. > >>>>> > >>>>> The pendulum mass m is not free falling because: > >>>>> > >>>>> Its distance to the centre of the Earth is: > >>>>> r₁ = r₀-L where L is the length of the pendulum. > >>>>> So r₁ < r₀, but the angular velocity of m is the same ω, > >>>>> and r₁ < ∛(GM/ω²), which means that: > >>>>> ω²⋅r₁ < GM/r₁² (2) > >>>>> The centripetal acceleration is smaller than the gravitational > >>>>> acceleration, so the force the string is acting on > >>>>> the pendulum mass is F₁ = m⋅(GM/r₁²-ω²⋅r₁) > >>>>> > >>>>> --- > >>>>> > >>>>> An interesting point is that you could have a pendulum > >>>>> on the other side of the ISS, pointing outwards from the > >>>>> centre of the Earth. > >>>>> The force the string is acting on the mass m is: > >>>>> F₂ = m⋅(ω²⋅r₂-GM/r₂²) > >>>>> > >>>>> F₁ and F₂ are called tidal forces. > >>>>> (It's a tidal bulge on both sides of the Earth)>> No comment, Pat? > > >> > >> You claimed that there were no forces on the pendulum. > >> I showed you that you could have a pendulum on both > >> sides of the ISS, and the pendulum strings will exert > >> forces on the pendulum masses, acting towards the ISS. > >> > >> And GR predicts the same! > >> > >> Do you realise that you were wrong, but won't admit it, > >> so you ignore my post, hoping that nobody will notice > >> your failure. > >> > >> -- > >> Paul > >> > >> https://paulba.no/ > > > > > Paul, I am happy to comment on the ISS pendulum problem. But first I would like to exploit my leverage over you in this matter. I will comment in a most shocking manner if you first agree to > > > > 1) State to this forum that the source of the gyroscopic counter torque which exactly opposes any torque placed on a gyroscope to keep it from falling over, as it does when a torque is applied to a g-scope when it is not spinning, is a complete scientific mystery and has never been derived from first principles. > > > > and > > > > 2) You stipulate that no matter what he types in this forum, Tom Roberts also does not understand the gyroscopic counter-torque. > > > > Do these two things and I will comment on your pendulum. > > I accept your capitulation. > > You make no attempt to defend your claim that no forces were > acting on the pendulum mass. Instead of admitting that you > were wrong, you are trying to escape in a most ridiculous way. :-D > > Case closed. Since our moon revolves around our sun...our moon is in fact a planet. You can call it a dwarf planet and even a satelitte planet. But, it is still a planet by defintion of a planet! There are more planet moons than there are any other type of planets in our solar system. i heard nasa is going to land on planet moon next year, is that true? -- The Starmaker -- To question the unquestionable, ask the unaskable, to think the unthinkable, mention the unmentionable, say the unsayable, and challenge the unchallengeable.