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Re: What has stopped rotating?

Cross-posted to 2 groups.

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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.

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Re: What has stopped rotating? Richard Hertz <hertz778@gmail.com> - 2023-11-24 09:37 -0800
  Re: What has stopped rotating? Richard Hertz <hertz778@gmail.com> - 2023-11-24 14:25 -0800
    Re: What has stopped rotating? "Paul B. Andersen" <relativity@paulba.no> - 2023-11-27 20:48 +0100
      Re: What has stopped rotating? patdolan <patdolan@comcast.net> - 2023-11-27 11:50 -0800
        Re: What has stopped rotating? "Paul B. Andersen" <relativity@paulba.no> - 2023-11-28 11:40 +0100
          Re: What has stopped rotating? patdolan <patdolan@comcast.net> - 2023-11-28 11:53 -0800
            Re: What has stopped rotating? "Paul B. Andersen" <relativity@paulba.no> - 2023-11-29 22:53 +0100
              Re: What has stopped rotating? Maciej Wozniak <maluwozniak@gmail.com> - 2023-11-30 11:00 -0800
                Re: What has stopped rotating? patdolan <patdolan@comcast.net> - 2023-11-30 12:12 -0800
                Re: What has stopped rotating? "Paul B. Andersen" <relativity@paulba.no> - 2023-12-01 13:22 +0100
                Re: What has stopped rotating? patdolan <patdolan@comcast.net> - 2023-12-01 18:34 -0800
                Re: What has stopped rotating? "Paul B. Andersen" <relativity@paulba.no> - 2023-12-02 12:39 +0100
                Re: What has stopped rotating? The Starmaker <starmaker@ix.netcom.com> - 2023-12-02 11:00 -0800
                Re: What has stopped rotating? "mitchr...@gmail.com" <mitchrae3323@gmail.com> - 2023-12-02 11:08 -0800
                Re: What has stopped rotating? Prokaryotic Capase Homolog <prokaryotic.caspase.homolog@gmail.com> - 2023-12-02 15:23 -0800
                Re: What has stopped rotating? Physfitfreak <Physfitfreak@gmail.com> - 2023-12-02 18:23 -0600
                Re: What has stopped rotating? The Starmaker <starmaker@ix.netcom.com> - 2023-12-02 20:02 -0800
                Re: What has stopped rotating? Physfitfreak <Physfitfreak@gmail.com> - 2023-12-02 22:35 -0600
                Re: What has stopped rotating? Maciej Wozniak <maluwozniak@gmail.com> - 2023-12-04 18:27 -0800

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