The condition at 1:09 for the open end (p=0) is only an approximation. This is valid for a situation where you have air in the tube and somehow can retain a vacuum on the outside. A more typical condition is found looking at the mechanical impedance of a piston placed at the end, calculating the mechanical impedance (Bessel and Hankel funtions for the circular crosssection tube), and converting back to acoustic impedance. Look up 'end correction' for more correct BCs than p=0.
57.00 you dont feel the heat because you’re far away, not because the speed is slow. A fire doesnt come on then the heat propagates seconds later, it propagates very quickly indeed, but it cannot physically propagate faster than sound as molecules carry ‘heat’. Unless its mostly infared.
There are small typos in his lecture notes, but there is no in this video. It's just that his confusing notations may lead us to think there might be typos there.
SIR, I HAVE BEEN OBSERVING A PHENOMENON FOR QUITE SOME TIME AND WANT TO HAVE YOUR VIEWS ON IT for my understanding, please spare some time IF WE LISTEN TO SOME RECORDED VOICE AT PLAIN SPEED AND THEN AGAIN LISTEN TO IT BUT WITH HIGHER PLAYBACK SPEED -> THEN ITS NOTICEABLE THAT THE VOLUME HAS DECREASED EVEN THOUGH IT HAS NOT BEEN DONE ACTUALLY AS A COROLLARY, IF THE PLAYBACK SPEED IS INCREASED ENOUGH THAT ITS STILL COMPREHENSIVE, AND THEN WITH THE SAME VOLUME IF PLAYBACK SPEED IS SET TO NORMAL, THEN THE LOUDNESS WOULD SEEM RAISED WHY SO.... ___________________________________________________________ ALSO PLEASE COMMENT ON ONE THING IF SUPPOSE A MAN'S SPEECH AT HIGH SPEED IS RECORDED AND THEN PLAYED BACK AT LOWER SPEED, WHY DOES IT NOT APPEAR AS THE SAME MAN IS SPEAKING AT NORMAL SPEED ALSO SAME HAPPENS ON PLAYING AT HIGHER PLAYBACK SPEED THE SPEECH RECORDED WHEN SPOKEN AT SLOW PACE.. ___________________________________________________________ SIMILARLY IF A VIDEO IS SHOT OF PERSON'S FACE WHEN HE IS SHAKING HIS FACE...THEN THE VIDEO CAPTURES HAZY FACE -> WHAT IF THE SAME VIDEO IS PLAYED ON A SCREEN AND THEN IF A CAMERA SHOTS THAT PLAYED VIDEO WHILE THE CAMERA IS SHAKING WITH SAME FREQUENCY, why doesn't it captures the shaking face....why loss of information!
The condition at 1:09 for the open end (p=0) is only an approximation. This is valid for a situation where you have air in the tube and somehow can retain a vacuum on the outside. A more typical condition is found looking at the mechanical impedance of a piston placed at the end, calculating the mechanical impedance (Bessel and Hankel funtions for the circular crosssection tube), and converting back to acoustic impedance. Look up 'end correction' for more correct BCs than p=0.
27:30 this guy won't stop playing games XD
jajaja
such professors really inspire me to become a physics professor someday :)
The boy playing hearthstone may work for Blizzard ,advertising department
Great class, very accessible.
At 48:19 boy is playing games , even around 30:30 i watched him
sharp eye men
My man in the 1 hour mark got all the girls in the lecture on his side 😂
57.00 you dont feel the heat because you’re far away, not because the speed is slow. A fire doesnt come on then the heat propagates seconds later, it propagates very quickly indeed, but it cannot physically propagate faster than sound as molecules carry ‘heat’. Unless its mostly infared.
40:30ish force and pressure nit the same, although if area is unit 🧐
amazing professor.
There are small typos in his lecture notes, but there is no in this video. It's just that his confusing notations may lead us to think there might be typos there.
27:25 that is the real truth nobody know. brother is playing game
Positive vibes
One student is playing game 48:20
amazing Chinese dude！
He's actually from Taiwan!
SIR, I HAVE BEEN OBSERVING A PHENOMENON FOR QUITE SOME TIME AND WANT TO HAVE YOUR VIEWS ON IT for my understanding, please spare some time
IF WE LISTEN TO SOME RECORDED VOICE AT PLAIN SPEED AND THEN AGAIN LISTEN TO IT BUT WITH HIGHER PLAYBACK SPEED -> THEN ITS NOTICEABLE THAT THE VOLUME HAS DECREASED EVEN THOUGH IT HAS NOT BEEN DONE ACTUALLY
AS A COROLLARY, IF THE PLAYBACK SPEED IS INCREASED ENOUGH THAT ITS STILL COMPREHENSIVE, AND THEN WITH THE SAME VOLUME IF PLAYBACK SPEED IS SET TO NORMAL, THEN THE LOUDNESS WOULD SEEM RAISED
WHY SO....
___________________________________________________________
ALSO PLEASE COMMENT ON ONE THING
IF SUPPOSE A MAN'S SPEECH AT HIGH SPEED IS RECORDED AND THEN PLAYED BACK AT LOWER SPEED, WHY DOES IT NOT APPEAR AS THE SAME MAN IS SPEAKING AT NORMAL SPEED
ALSO SAME HAPPENS ON PLAYING AT HIGHER PLAYBACK SPEED THE SPEECH RECORDED WHEN SPOKEN AT SLOW PACE..
___________________________________________________________
SIMILARLY IF A VIDEO IS SHOT OF PERSON'S FACE WHEN HE IS SHAKING HIS FACE...THEN THE VIDEO CAPTURES HAZY FACE
->
WHAT IF THE SAME VIDEO IS PLAYED ON A SCREEN AND THEN IF A CAMERA SHOTS THAT PLAYED VIDEO WHILE THE CAMERA IS SHAKING WITH SAME FREQUENCY, why doesn't it captures the shaking face....why loss of information!
Every Body following?
A Loren Emmerich production was here.
Cat get shocked at 15 slide😂
Why is A^change of x = V0 at 39.45 minute? Can anyone answer me?
It becomes to be volume at a standard point Because delta x is not displacement of molecules.
1:1:16😂😂
Walter lewin 👑
It's truly sad how he didn't discuss a subtle concept, he found the equation at x=0 but assumes it works for all (x, t)
?
😂😂😂