Sagittarius A-Star's latest activity
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Sagittarius A-Star reacted to A.T.'s post in the thread Undergrad Question about Parallel Transport with
Informative.
Right, the longer part of the great circle is a saddle. It's easier to remember that each part is a path of stationary length. -
Sagittarius A-Star reacted to PAllen's post in the thread Undergrad Question about Parallel Transport with
Like.
No, not longest distance - you can deviate from a non minimal great circle path and make it longer - by any amount with squiggles. In... -
Sagittarius A-Star reacted to A.T.'s post in the thread Undergrad Question about Parallel Transport with Informative.
... or longest distance, if you go in the opposite direction. The general property is that geodesics are paths of stationary distance.
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Sagittarius A-Star reacted to A.T.'s post in the thread Undergrad Axial angular momentum calculation with Like.
Using the wedge product (bi-vector) instead of the cross product (pseudo-vector) avoids the issues pseudo-vectors have under mirror...
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Sagittarius A-Star replied to the thread Undergrad Axial angular momentum calculation.Yes. In this case, the cross product must be replaced by the wedge product. ##\mathbf L = \mathbf r \wedge \mathbf p##
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Sagittarius A-Star reacted to cianfa72's post in the thread Undergrad Axial angular momentum calculation with Like.
Better, I'd say the angular momentum is a bi-vector -- https://en.wikipedia.org/wiki/Angular_momentum
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Sagittarius A-Star reacted to A.T.'s post in the thread Undergrad Can a Gyroscope in a Satellite Detect Orbit? with Like.
Another potential reason: Gyroscopes use only electric energy, which can be obtained via solar panels. For thrusters you would need to...
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Sagittarius A-Star replied to the thread Undergrad Can a Gyroscope in a Satellite Detect Orbit?.They try to avoid the use of thrusters and use control moment gyroscopes most of the time, to not disturbe micro-gravity experiments...
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Sagittarius A-Star reacted to pervect's post in the thread Undergrad Can a Gyroscope in a Satellite Detect Orbit? with Like.
As far as I know, this is just due to the ISS being deliberately locked to a constant orientation relative to the Earth, for practical...
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Sagittarius A-Star replied to the thread Undergrad Can a Gyroscope in a Satellite Detect Orbit?.The gyroscope in the video is spinning about it's axis (even while it's housing is not spinning), but it is difficult to see. How this...
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Sagittarius A-Star replied to the thread Undergrad Can a Gyroscope in a Satellite Detect Orbit?.It's the ISS, which rotated, not the gyroscope axis: Source...
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Sagittarius A-Star replied to the thread Undergrad Is this another "paradox" or a veritasium mistake?.In theses notes is also mentioned, that Johann Georg von Soldner calculated the gravitational deflection of light as it passes the sun...
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Sagittarius A-Star reacted to PeterDonis's post in the thread Undergrad Is this another "paradox" or a veritasium mistake? with Like.
To be more precise: the global bending of light when passing close by a massive object, i.e., the angle between its incoming path at...
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Sagittarius A-Star reacted to pervect's post in the thread Undergrad Is this another "paradox" or a veritasium mistake? with Like.
It would be bent twice as much by a mass. But I don't think not on an elevator. I don't have a reference for this statement, but I...
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Sagittarius A-Star reacted to Greg Bernhardt's post in the thread Announcement RIP Vanadium 50 with
Sad.
I have some solemn news to report. Many in the community had been wondering where the prolific @Vanadium 50 has been. V50 hasn't posted...