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Physics
Special and General Relativity
Frame Dragging: Q&A for Time Travelers
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[QUOTE="stefan r, post: 6008757, member: 615251"] ω is greek letter "omega". It is [URL='https://en.wikipedia.org/wiki/Radian_per_second']radians per second[/URL] which equals 9.55 rpm. A lot of cars have a gauge that reads thousands of rpm. Multiply that number by around 100. J is the [URL='https://en.wikipedia.org/wiki/Angular_momentum']angular momentum[/URL]. I think it is the same as L if you disregard particle [URL='https://en.wikipedia.org/wiki/Spin_(physics)']spin[/URL]. Alina Zagitova does a beautiful demonstration of angular momentum in this [URL='https://www.youtube.com/watch?v=TlXCk1LDlC0']video[/URL]. at end of 2:57 she kicks and then pulls her arms and legs into her center in 2:58. In 2:59 she has arms out and leg fully extended for the landing and then hops and pulls everything in for the rotations in 3:00. They have a slow motion freeze frame image at 6:04. At 4:18 she is adds angular momentum by kicking in a diagonal camel spin. She then does a sit spin(4:22) and an I-spin(4:26) using that angular momentum. She gets a full 6 seconds of spin and chews up the ice because most of her mass is directly above the skate when her foot is above her head. If you understand and can talk about figure skating you probably understand angular momentum good enough for any casual conversation or for science fiction writing. I do not have any experience traveling through time. My impression was that a person would already become molecular soup if they get close enough to a black hole for the difference to matter. If you hand wave [URL='https://en.wikipedia.org/wiki/Spaghettification']spaghettification[/URL] then you can hand wave the spin too. Just assume classical mechanics in science fiction unless it is convenient to do otherwise. G is the [URL='https://en.wikipedia.org/wiki/Gravitational_constant']gravitational constant[/URL]. [/QUOTE]
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Frame Dragging: Q&A for Time Travelers
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