0 Members and 1 Guest are viewing this topic.
(Am I The only one who worries about anyone in zero G who thinks that taping 3 CD players together at right angles is ter than taping them together with the axes aligned?)Anyay, you are missing the point, and I suspect it's deliberate.Imagine that the CD player has an IR remote control and is running on batteries.You set it in front of you in zero G then, using the remote control, you press "play".What happens?
We have been here before. We discussed it, never came to a conclusion a few months back.
The 3 CD players at 0:49s when the CDs are not spinning inside. There is an external impulse to the system of connected 3 CD players when they are not running.The system center of mass moves/translates at velocity v1.
The CDs are spinning inside at 0:55s.
There is an external impulse (it appears to be the same magnitude, but off center) to the system of connected 3 CD players when the are running (CDs are spinning inside).The system does not start to rotate. The system wobbles.
The system center of mass does not move/translates at velocity v1 (magnitude).
The system center of mass is resisting the straight line motion/translation.
Do we have an agreement that the system demonstrates different attributes, the system behaves differently due to the internal motion of inner parts even thought the total net angular momentum is the same before the external impulse?
do you agree there is a difference in the system response to the impulse as I described it?
If all is well balanced (ideal) then the discs will spin inside and the structure of CD players stays as is.
(Am I The only one who worries about anyone in zero G who thinks that taping 3 CD players together at right angles is better than taping them together with the axes aligned?)
One observation that nobody has mentioned, is that the earth's core spins faster than the surface of the earth. This was discovered in 1996 but has been ignored by the status quo, since too much credit would have required a complete revision of current earth theory.
If we accept this data as true, then we need to revise the earth sciences since no models anticipated this,
Quote from: Jaaanosik on 12/10/2020 18:19:31If all is well balanced (ideal) then the discs will spin inside and the structure of CD players stays as is.Would you like a second guess?It's related to this bitQuote from: Bored chemist on 12/10/2020 17:47:20(Am I The only one who worries about anyone in zero G who thinks that taping 3 CD players together at right angles is better than taping them together with the axes aligned?)
taping them together with the axes aligned
Anyay, you are missing the point, and I suspect it's deliberate.Imagine that the CD player has an IR remote control and is running on batteries.You set it in front of you in zero G then, using the remote control, you press "play".What happens?
The 3 pseudovectors need to form a plane.
Quote from: Jaaanosik on 13/10/2020 19:55:03The 3 pseudovectors need to form a plane.That's about the one thing that three orthogonal vectors can't possibly do.
So, anyway, you forgot to answer this bitQuote from: Bored chemist on Yesterday at 17:47:20Anyay, you are missing the point, and I suspect it's deliberate.Imagine that the CD player has an IR remote control and is running on batteries.You set it in front of you in zero G then, using the remote control, you press "play".What happens?
Well, four CD players forming a tetrahedron would be even funnier.But I would still like you to answer the question you keep ignoring.Quote from: Bored chemist on 13/10/2020 21:08:17So, anyway, you forgot to answer this bitQuote from: Bored chemist on Yesterday at 17:47:20Anyay, you are missing the point, and I suspect it's deliberate.Imagine that the CD player has an IR remote control and is running on batteries.You set it in front of you in zero G then, using the remote control, you press "play".What happens?
But I would still like you to answer the question you keep ignoring.
Quote from: Bored chemist on 13/10/2020 22:49:04But I would still like you to answer the question you keep ignoring.He did indeed answer the question, albeit a very wrong one. Jano apparently has no clue how to do vector arithmetic. Lacking his literacy in the language of mathematics, I'm not bothering to continue. Have fun.Some errors:His 4-CD tetrahedron would have zero net angular momentum and would thus exhibit zero gyroscopic effects.No pair of sides of a regular tetrahedron meet at a 60° angle, nor do the axes passing through their centers.The angle (called a dihedral angle) is about 70.5°.
60 degrees was for the triangular prism, 3 CD players, not the tetrahedron and the 4 CD players.I did not talk about any angles in regards to the tetrahedron.
I answered in the post #333.
the discs will spin inside and the structure of CD players
But I would still like you to answer the question you keep ignoring.Quote from: Bored chemist on Yesterday at 21:08:17So, anyway, you forgot to answer this bitQuote from: Bored chemist on Yesterday at 17:47:20Anyay, you are missing the point, and I suspect it's deliberate.Imagine that the CD player has an IR remote control and is running on batteries.You set it in front of you in zero G then, using the remote control, you press "play".What happens?
Quote from: Jaaanosik on 13/10/2020 23:26:48I answered in the post #333.No, you did not.I was talking about just one single CD player.You were talking about more than one.Quote from: Jaaanosik on 12/10/2020 18:19:31 the discs will spin inside and the structure of CD playersNo please stop trying to evade the question.Quote from: Bored chemist on 13/10/2020 22:49:04But I would still like you to answer the question you keep ignoring.Quote from: Bored chemist on Yesterday at 21:08:17So, anyway, you forgot to answer this bitQuote from: Bored chemist on Yesterday at 17:47:20Anyay, you are missing the point, and I suspect it's deliberate.Imagine that the CD player has an IR remote control and is running on batteries.You set it in front of you in zero G then, using the remote control, you press "play".What happens?
Three CD players would behave as one CD player if the axes are aligned and they spin in the same direction.
The CDs would spin inside and the CD players would spin in the opposite direction in ideal conditions.The total net momentum would be 0.
Quote from: Jaaanosik on 14/10/2020 00:46:0160 degrees was for the triangular prism, 3 CD players, not the tetrahedron and the 4 CD players.I did not talk about any angles in regards to the tetrahedron.My apologies: You did say prism. My mistake there. What's the point of arranging them in that pattern? Why do you think the guy in the video didn't choose to do that? Why is something with no angular momentum 'ideal'? What benefit do you expect from it, or from the tetrahedral arrangement? You'd not be able to tell if they were running or not in either case. Might as well just tape three decks of cards together in a prism arrangement.OK, I made a second mistake in reading what you said. You didn't answer BC's question in post 333 since it is preceded by 'if ideal', which apparently means a different arrangement than the 1-CD or 3-orthogonal cases that he was asking about. So you answered a different question. My apologies to BC this time for that mis-read.