robphy's latest activity
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robphy replied to the thread History Biographies, History, Philosophy of Physics.Here's a 2025 interview with Abhay Ashtekar (Penn State), split into parts. (I was especially interested in his stories with Robert... -
So are we! :welcome:
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robphy reacted to jedishrfu's post in the thread High School True static equilibrium and effects on time with
Like.
MENTOR NOTE: This thread has been split into two parts. This part discusses the Static Equilibrium and is now closed, while the... -
robphy replied to the thread Undergrad Light clock treating horizontal and vertical motion differently?.And so, a model (motivated by physically observed phenomena) and a set of tools to analyze the model lead to testable predictions, which...
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robphy replied to the thread Undergrad Light clock treating horizontal and vertical motion differently?.The Michelson-Morley apparatus is essentially a [typical] transverse light-clock (whose light-signal is perpendicular to the direction...
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robphy reacted to Ibix's post in the thread Undergrad Light clock treating horizontal and vertical motion differently? with Like.
You can't - that would contradict the second postulate.
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robphy replied to the thread Undergrad Light clock treating horizontal and vertical motion differently?.In special relativity, there is no such reference frame (that is equivalent to that of a typical ["timelike"] observer) where light is...
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robphy reacted to Herman Trivilino's post in the thread High School Relativistic simultaneity and effects on time with Like.
My thoughts are just the opposite. I think it's the very first thing that ought to be introduced. Of course only qualitatively at first...
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robphy reacted to Astronuc's post in the thread Tungsten Cubes for STEM Education — Looking for Feedback with Like.
I had the same thoughts. Without other cubes of different metals, e.g., Mo, Fe, Cu, Al, there a limited uses for a single cube. One...
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robphy replied to the thread Tungsten Cubes for STEM Education — Looking for Feedback.Is it just Tungsten, or are there other metals available (in the same size)? These could be useful for measurements of mass and volume...
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robphy reacted to Herman Trivilino's post in the thread High School Relativistic simultaneity and effects on time with Like.
In my experience this definitely takes a great deal of time and effort. Reading something like Spacetime Physics by Taylor and Wheeler...
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robphy reacted to SiennaTheGr8's post in the thread High School Need tips to understand Relativistic Energy in Special Relativity with Like.
You can also derive ##d \gamma = \gamma^3 (\vec \beta \cdot d \vec \beta)## fairly easily and use that to do a change of variables...
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robphy reacted to Hornbein's post in the thread Music Cover songs versus the original track, which ones are better? with Like.
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Good afternoon, This is not Paul, but rather his son Robert. I am very sad to write here that my dad passed away on Saturday...
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robphy replied to the thread Music Cover songs versus the original track, which ones are better?.https://en.wikipedia.org/wiki/Psycho_Killer (1977) https://en.wikipedia.org/wiki/Talking_Heads Talking Heads - Psycho Killer (Earliest...
