robphy's latest activity
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robphy replied to the thread Cover songs versus the original track, which ones are better?.Black Sabbath (1970) https://en.wikipedia.org/wiki/Black_Sabbath_(song) https://en.wikipedia.org/wiki/Black_Sabbath_(album)... -
robphy replied to the thread Undergrad How does reciprocal time dilation work?.This comment complements the recent comment by @Matterwave , as well as directly connect to your recent calculation. This is exactly...
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robphy replied to the thread Undergrad How does reciprocal time dilation work?.A geometric analogy may be useful here. Consider two radius vectors to a circle, then consider their tangent-lines. (See below.) An...
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robphy replied to the thread Cover songs versus the original track, which ones are better?.Run to the Hills (1982) https://en.wikipedia.org/wiki/Run_to_the_Hills https://en.wikipedia.org/wiki/Iron_Maiden (1982) Run To The...
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robphy replied to the thread Undergrad Reciprocal time dilation on the example with two moving trains.Here's a spacetime diagram drawn on rotated graph paper. (All light-clock-diamonds have the same area and all light-clock-diamonds have...
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robphy replied to the thread Undergrad Reciprocal time dilation on the example with two moving trains.Then make the arithmetic easier by using (say) 5.0 s and 4.0 s.
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robphy replied to the thread High School Can anyone deeply understand relativity?.Take the next sentence in my quote. A "light-second" is a perfectly good unit of length, and on the road to truly natural units where...
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robphy replied to the thread Undergrad Reciprocal time dilation on the example with two moving trains.Draw a position-vs-time graph (aka a spacetime diagram) which will likely clarify the setup and the problem.
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robphy reacted to pinball1970's post in the thread Cover songs versus the original track, which ones are better? with
Like.
I have some catching up to do! -
robphy reacted to Dale's post in the thread High School Can anyone deeply understand relativity? with Like.
My “aha moment” came when I drew my first spacetime diagram complete with coordinate lines for both frames via the Lorentz transform...
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robphy reacted to sbrothy's post in the thread High School Can anyone deeply understand relativity? with
Haha.
I can't believe I got the last word in a thread in the relativity forum?! I'm sure you're yanking my chain now! This wont stand... -
robphy replied to the thread High School Can anyone deeply understand relativity?.Just for historical fairness, one should also mention Galileo (...
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robphy reacted to Ibix's post in the thread High School Can anyone deeply understand relativity? with Like.
Special relativity is fairly simple, although @robphy is absolutely correct that you need a modern geometric approach to make it simple...
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robphy replied to the thread High School Can anyone deeply understand relativity?.In college, I had a grasp of tensor calculus and could work problems in special relativity ...but there was a disconnect. My "aha...
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robphy replied to the thread High School Can anyone deeply understand relativity?.I love this quote... (bolding mine)
