robphy's latest activity
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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
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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... -
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...
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robphy replied to the thread I want to help Physics education. What should I do?.Concerning high-school physics clubs, here are more ideas from other platforms...
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robphy reacted to Hornbein's post in the thread Favorite Mashups - All Your Favorites in One Place with Like.
If that had been released in the 70s it would have been a big hit.
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robphy replied to the thread Physics Need some advice! (making a physics YouTube channel).This is an enlightening video: “The Future of Veritasium”
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robphy replied to the thread Complementary resources to Feynman Lectures.Since this resource hasn't already been mentioned... https://www.feynmanlectures.caltech.edu/ in particular, there's "Feynman's Tips...
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robphy replied to the thread Intro Physics What is the best conceptual high school physics book?.I have used Hewitt for the past four years for a college conceptual-physics course (focusing on mechanics and waves). It is a really...
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robphy replied to the thread Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime.First, I acknowledge what you say about spacetime diagrams being confusing. So, some of my efforts have tried to develop additional...
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My favourite popular book is Geroch's "General Relativity from A to B".
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robphy replied to the thread Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime.Along the lines of @Ibix 's construction of the "perpendicular", the essential part of the construction is 1. constructing the...
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robphy reacted to Sagittarius A-Star's post in the thread Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime with Like.
The ##x'## axis rotates counter-clockwise (hyperbolic rotation of the coordinate system), see https://www.geogebra.org/m/NnrRvA46 Also...
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robphy replied to the thread Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime.Given a line, to draw a "perpendicular [to it]" in Minkowski spacetime... from my answer...
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robphy reacted to Ibix's post in the thread Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime with Like.
Draw x-t axes with a scale chosen so that ##c=1##, as you have done. Draw the path of an object moving at constant speed ##v## passing...
