Halc's latest activity
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Halc replied to the thread Undergrad The paradox of symmetrical time dilation.This is wrong. He may compute this, but it is not what he sees. Both observers see the other clock run slow when they see the clocks... -
Halc reacted to Astronuc's post in the thread Undergrad M31-2014-DS1, slow disappearance of a massive star with
Informative.
I heard a report of an unusual disappearance of a massive star in the Andromeda (M31) galaxy. M31-2014-DS1 was a supergiant How it was... -
Halc replied to the thread Undergrad Linear vs rotary motion.It measures a proper rotation rate, which is observer invariant. The axis orientation is also proper, effectively 'thataway', which...
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Halc replied to the thread Undergrad Linear vs rotary motion.One of the more precise methods is to use a ring laser gyroscope, which leverages the Sagnac effect to determine rotation rate and axis...
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Halc replied to the thread Undergrad Linear vs rotary motion.Indeed. It takes more coordinates to define a rotating frame (in say Minkowskian spacetime) that it does to define an inertial one...
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Halc replied to the thread Undergrad Linear vs rotary motion.Good example of why proper acceleration is absolute. As for rotation, I suppose it is because the physics of a rotating frame is...