Sagittarius A-Star's latest activity
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Sagittarius A-Star reacted to FactChecker's post in the thread Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime with
Like.
This is now my favorite video explanation of the Minkowski diagram. It is great that a school like Stanford makes this available on the... -
Sagittarius A-Star replied to the thread Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime.Derivation of the Lorentz transformation in Minkowski spacetime diagrams:
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Sagittarius A-Star replied to the thread Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime.The ##x'## axis rotates counter-clockwise (hyperbolic rotation of the coordinate system), see https://www.geogebra.org/m/NnrRvA46 Also...
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Sagittarius A-Star reacted to PeterDonis's post in the thread Undergrad Revisiting the Light Clock with Like.
You're wrong because you're using the wrong tools for the job you're trying to do. You haven't done what I strongly advised you to do in...
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Sagittarius A-Star replied to the thread Undergrad Revisiting the Light Clock.The usual light clock does not contain sources of light located on a flat inclined surface. Both mirrors are oriented horizontally. I...
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Sagittarius A-Star replied to the thread Undergrad Revisiting the Light Clock.This doesn't exist. But you can for example approximate locally a (small) segment of a spherical wave-front by a plane, because the...
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Sagittarius A-Star reacted to A.T.'s post in the thread Undergrad Revisiting the Light Clock with Like.
That's nice. But what is missing, is a systematic approach: 1) Define the full scenario in one frame. 2) Use the full Lorentz...
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Sagittarius A-Star reacted to weirdoguy's post in the thread Undergrad Revisiting the Light Clock with Like.
Besides all above, I think that your attitude towards this problem is what holds you back, even at the subconsious level. You are wrong...
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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...
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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...