Recent content by robphy

"Thrill" by Band-Maid (2014) https://en.wikipedia.org/wiki/Band-Maid https://bandmaid.tokyo/ (unofficial touring info: https://www.songkick.com/artists/8855314-bandmaid ) It's nice to see covers of songs from a relatively-new band that I've liked. When I first stumbled upon Band-Maid in 2018...

You might find some helpful notes among: Notes by https://en.wikipedia.org/wiki/Robert_Geroch https://home.uchicago.edu/~geroch/Course%20Notes https://home.uchicago.edu/~geroch/

(continuing with 1980s glam metal... #997 Motley Crue - #1005 Loudness ) https://en.wikipedia.org/wiki/EZO (1987 album) with "House of 1,000 Pleasures" as the lead track https://en.wikipedia.org/wiki/Ezo_(band) ( E.Z.O. interview on Headbanger's Ball (1989) ) HOUSE OF 1,000 PLEASURES - EZO -...

https://en.wikipedia.org/wiki/Crazy_Night (1985) https://en.wikipedia.org/wiki/Loudness_(band) Loudness - Crazy Nights (HD) (solo clip) LOUDNESS live at MADISON SQUARE GARDEN 1985 (2016) Stormwolf - Crazy Nights (Loudness Cover) (2019) LOUDNESSのCRAZY NIGHTS叩いてみた！【ラウドネス】【DrumCover】 -...

https://en.wikipedia.org/wiki/Satch_Boogie (1986) (2012 performance) Joe Satriani "Satch Boogie" At: Guitar Center see also Joe Satriani plays Satch Boogie on a Les Paul! No whammy bar! | Les Paul Tribute Covers by kids (up to age 19). (2023) JayBird shreds 'Satch Boogie' (Joe Satriani)...

https://en.wikipedia.org/wiki/Live_Wire_(Mötley_Crüe_song) (1982) Mötley Crüe - Live Wire (Official Music Video) I saw this video on a late night show featuring rock videos (on a UHF channel in New York) and I said to myself... this band is going to break-out. Soon after, Motley Crue released...

KNULP https://www.youtube.com/@knulp%2E . (there's a period (%2E) at the end of the URL) has some very nice covers, with nice videography and attention to detail. The "KNULP One Man Band" playlist is impressive. Earlier I posted in #964 and #966 [i added solo links here] Here is STAIRWAY TO...

https://en.wikipedia.org/wiki/Bohemian_Rhapsody (1975) Queen – Bohemian Rhapsody (Official Video Remastered) (2011) Jake Shimabukuro - "Bohemian Rhapsody" - TED (2010) - ukelele cover (2017) Pentatonix - Bohemian Rhapsody (Official Video) (2023) BOHEMIAN RHAPSODY (Queen) One Man Band...

https://en.wikipedia.org/wiki/Since_You_Been_Gone [1976] Russ Ballard - Since You've Been Gone (Supersonic, 1976) FAMILIAR ??? [1978] Head East - Since You Been Gone (2014) Head East - Since You've Been Gone - Live @ Ribco [1979] Rainbow [with Graham Bonnet]- Since You've Been Gone...

Note: The Lady Shelters cover was posted by @morrobay in #510 Here were some other covers of Dancing in the Street in #459 and (Karen Carpenter drum solo) #509.

Videos of covers of Paul Gilbert's ( https://en.wikipedia.org/wiki/Paul_Gilbert ) work with Amusing / Possibly distracting features ... followed by Paul Gilbert's 2023 announcement of his covers of songs by Ronnie James Dio. This cover is marred by a very unenthusiastic keyboard player...

##\xi## ?:wink: Some people prefer to use a parameter, which is actually non-additive, but treat it as additive [due to inappropriate extrapolation]. ##v##

In discussions with physics teachers, rapidity is (sadly) sometimes considered an advanced topic. (See https://www.physicsforums.com/threads/question-regarding-different-editions-of-spacetime-physics-by-wheeler.1004722/post-6513631 ) In typical problems, one doesn't need the value of the...

:) See my old posts https://www.physicsforums.com/threads/trying-to-understand-space-time-diagrams.1045805/post-6803852 and https://www.physicsforums.com/threads/trying-to-understand-space-time-diagrams.1045805/post-6803784

I'd go further and develop a trigonometric approach, especially since trigonometry is probably more familiar. The time-dilation \gamma-factor is essentially the hyperbolic-cosine function of rapidity, interpreted as "adjacent over hypotenuse". The dimensionless-velocity \beta-factor is the...