The fact that this video shot in 2004 is still prevalent and useful in 2021 shows that knowledge and dedication lives forever....great lecture sir.
@anishtaori1426
2 жыл бұрын
lundoi
@AJ-wq3xm
Жыл бұрын
Its going to be 2023 in some days these lectures are evergreen
@priyanshrawat442
10 ай бұрын
Damn i was born in 2004
@Vivir_Astucia
8 ай бұрын
U mean 2024
@lucifergo4332
4 жыл бұрын
Sir I am from IIT. Even the professors here are really intelligent but they dont know how to impart knowledge to students. But you, are just awesome
@zombiesalad2722
4 жыл бұрын
Bhaiya aap quora use karte ho?
@waiitwhaat
3 жыл бұрын
fellow IIT-ian, and i 100% agree with you. This lecture helped me understand the concept so clearly, it's never getting out of my head again!
@dhruvpatel4773
3 жыл бұрын
Does this really comes in engineering!!! I am studying this for getting into IIT
@lecturesbywalterlewin.they9259
3 жыл бұрын
@@dhruvpatel4773 Keep in mind that MIT is only a very mediocre University. That's why only 101 people who studied at MIT or who lectured there received a Nobel Prize. *That's very embarrassing.* Luckily you got a much better education.
@dhruvpatel4773
3 жыл бұрын
@@lecturesbywalterlewin.they9259 oh sir.. you replied. But MIT is best university in world according to rankings. Even topper of NEET and JEE prefer MIT over other colleges. I don't know in dept about noble prices but 101 is very big number for me. I was socked to see your reply 🥴
@matrixate
5 жыл бұрын
This was really smooth. The pause button was my friend throughout this lecture. Thank you Professor. I felt so lost before. You've given me a new perspective on this.
@lecturesbywalterlewin.they9259
5 жыл бұрын
:)
@itsniea
6 жыл бұрын
The real question is how he flawlessly did that dotted equilibrium line so quickly.
Wasn't expecting an answer, amazing, thanks for sharing I'll check them out!
@dibyajoytidas3743
15 күн бұрын
Thank you prof. Lewin for these videos ... Our prof. here at IISER Kolkata, taught these things really well but going through your lectures always feels like gaining something additional and valuable...❤
@lecturesbywalterlewin.they9259
14 күн бұрын
Glad to hear that
@markl5133
4 жыл бұрын
I really enjoy watching your videos. I have learned so many things just watching about 20 of your lecture videos. May the cosmic force be with and God Bless you.
@Vxt943
5 жыл бұрын
Great sir. Today watching it for 25 timea but it's still feels amazing as if I am watching a movie....and not studying....long live professor.....
@TheSabri306
4 жыл бұрын
Thank you professor. The way you taught physics is fascinating.
@camilodominguez4678
4 жыл бұрын
What a lovely way to enjoy Physics by watching your Lectures Professor Lewin, Kind regards.
@Grozione
Жыл бұрын
Thank you so much Professor, I am about to graduate in Acoustic Engineering and your lectures are a huge inspiration to think deeply about the basics of what I do. And obviously that is always crucial! Love from Italy ❤
@lecturesbywalterlewin.they9259
Жыл бұрын
you are very welcome
@garyfeng9528
3 жыл бұрын
BEST Physics lecture I have never taken.
@shadowterrarian4073
4 жыл бұрын
powerful enough to make physics enter my DNA. Fantabulous!
@mp3lwgm
6 жыл бұрын
Brilliantly exciting. The on table demonstration-performance (43:50) is just about the best pedagogy I’ve ever seen.
@lecturesbywalterlewin.they9259
6 жыл бұрын
:)
@mp3lwgm
6 жыл бұрын
Live long and prosper.
@bhatfaizu
6 жыл бұрын
😍😍😍😍😘😘😘 falling in love is also a resonance and it can break your heart...👌👌👌👌👌
@lecturesbywalterlewin.they9259
6 жыл бұрын
very true
@learningdose7371
4 жыл бұрын
@@lecturesbywalterlewin.they9259 you killed it
@shreyanshdewangan4327
Жыл бұрын
Sir I am a fresher at IIT KANPUR and since our curriculum is similar to that at the MIT so your lectures are turning out to be of great use.THANKS A LOT SIR, The profs here are highly qualifier, they have abundance of knowledge but they lack the skills of teaching. I don't get that if IIT cannot provide profd who actually teach well then which institute can?????
@babygoat-go6jf
6 ай бұрын
apparently this is in the JEE Advanced syllabus now, and I've found this gem.....😅😅 Thank you so much sir!!
@vinayjumani839
6 ай бұрын
Yeah right 😅
@gugax10
7 жыл бұрын
I really don't understand why these students are not so participative in classes. Here in Brazil, at least, when the teacher has a good didactic, we always try to answer teacher's questions. In the video, they don't even help the teacher to correct silly mistakes (that can happen to everyone).
@lecturesbywalterlewin.they9259
7 жыл бұрын
same at MIT. I often ask questions like *who thinks it will increase? some students raise their hands * who thinks it will decrease? * who thinks it will stay the same I often ask questions that I want them to think about at home
@sn59826
5 жыл бұрын
They are simply dumbfounded by the brilliance of the lecture! I strongly wish that I had such teachers for all my subjects in high school and college. A proper understanding can ignite a person's creativity.
@inamulhaq5064
2 жыл бұрын
Nobel prize of best teacher goes to sir Walter lewin💞
@marscience7819
4 жыл бұрын
This is very good. No wonder students have to pay a fortune to go there (if you are not bankrupt but show intelligence, or....). Most people will not realize how good this is, and actually think he is silly, or that it makes no sense at all. It's actually old knowledge explained clearly and efficiently. Americans are losing this to other places, but aren't even aware of it.
@OmiP42
4 жыл бұрын
You can, in fact, break wineglasses with your voice! There's a catch, of course. The glass has to be made of crystal, and not amorphous glass. Crystalline glass has higher q compared to amorphous glass and can break cleanly. Mike Boyd demonstrated this in his video where he learned to do exactly this. kzitem.info/news/bejne/uWyfsGSeiaJ4mJg
@chessematics
9 ай бұрын
18:09 the 90° phase gap is actually obvious if one considers how resonances are physically created. Take a swing for example: when the swing comes to a halt, at that point the swinger is supposed to start pushing it
@forfun5140
3 жыл бұрын
3:06 If the driving force was sin(wt), would the right hand side then have a factor of j?
@ShivamKumar-mg4xb
3 жыл бұрын
Wow......... what a lecture it is!!!!!!! its more than awesome.......
@lecturesbywalterlewin.they9259
3 жыл бұрын
Thank you so much 😀
@bimalrajk7
4 жыл бұрын
Falling in love is a form of resonance and both can be destructive . വാക്കുകൾ അറം പറ്റി പോയല്ലോ ആശാനേ ;)
@karencummings8302
5 жыл бұрын
I just fell in love with Walter Lewin! If you are a Physics Prof, watch this video. It's great, especially the ending.
@lecturesbywalterlewin.they9259
5 жыл бұрын
omg!
@angelodibella3150
3 жыл бұрын
This man could teach a five year old this stuff and they would understand everything...
@ShAlAmAnAyA3
4 жыл бұрын
Wow, what an amazing professor! Thank you for this video!
@elsharko87
6 жыл бұрын
Amazing lecture! thanks for sharing
@lecturesbywalterlewin.they9259
6 жыл бұрын
:)
@daeho_sambo
3 жыл бұрын
The omlette on his shirt tho😂
@muneebhasan5464
4 жыл бұрын
really Amzing to watch....that kind of lecture although i have no interest in this subject and everything that pro.teachs is gone above my mind ........😥🤔🤔🤔🤔😍😍😍
@sandeepchauhan4411
3 жыл бұрын
What a wonderful full lecturer
@Jirayu.Kaewprateep
4 жыл бұрын
The delta Fn is signusoid Fn, it can be shifted to new equlibrium. For the soilder cannot across the bridge as they said respectfully, there is a story behind, if on foot soilder cross the bridge all at once if there is any acident by air or any then loss the unit otherwise just spill out or devide by half or smaller group also for far seeing.
@lecturesbywalterlewin.they9259
4 жыл бұрын
I mention this in my 8.01 lecture on resonance + Tacoma Bridge
@mohitvyas7727
3 жыл бұрын
At 1.45 why we take external force as F=F°cos wt ?? I mean why didn't we use F=F° sin wt
@gamerboyss5310
3 жыл бұрын
because of the Euler expansion......cost+i.sint (basically to avoid complexity)
@abhishekrbhat8919
3 жыл бұрын
Thank you sir for your wonderful lectures
@Shreshth76
4 жыл бұрын
Professor Lewin, please check your 8.03 playlist's lecture-3; it has been replaced by the third lecture of 8.03 posted by the "allure of physics" channel. Kindly, replace it with the original as the original one has better video quality. Thank you.
@lecturesbywalterlewin.they9259
4 жыл бұрын
I know this but I cannot fix it. On one day, out of the blue, I noticed that lect 3 of 8.03 was missing. I have no idea how that happened. Luckily I could link it to the version in "For the Allure of Physics".
@Dannydefeato25
3 жыл бұрын
What a fantastic professor
@astropredo
5 жыл бұрын
Thanks, professor
@dalitas
7 жыл бұрын
4:09 a reference for the future exams?
@sniperM1230
3 жыл бұрын
man i wish i found this in my first year of collage
@uripadilla8368
2 жыл бұрын
thank you sir, you save me and show me the way to learn mechanical vibrations
@lecturesbywalterlewin.they9259
2 жыл бұрын
You are most welcome
@vishnuvamshi2927
4 жыл бұрын
Amazing prof
@latex.gm21
7 ай бұрын
Awesome 😀😀😊😊
@arpit3756
2 жыл бұрын
Thanku, it made whole topic clear
@UBADEKUBA
3 жыл бұрын
great video very informative and entertaining as well.
@lecturesbywalterlewin.they9259
3 жыл бұрын
Glad you enjoyed it!
@shresthverma2542
6 жыл бұрын
Sir I am from India and I liked Ur lecture very much So can u pls tell me which book u prefer to read
@mazbakamalratul3972
5 жыл бұрын
Vibration and waves A.p. frech
@physl2787
5 жыл бұрын
Whisch physicist has do do lot of work in vibration and simple harmonic motion
@ms-uj3qe
8 жыл бұрын
Professor, around 54:00, you mentioned that an oscillation on that track, if there were 4 cars and 5 springs would have 4 resonance frequencies. It`s always the case when a system has n constituents that it will have n normal modes? Or the case is that it will have "up to n" normal modes? For example, if in that same track there were n cars and n+1 springs, and all the cars had different masses and the springs had different constants, would it still have, for sure, n resonance frequencies?
@maxsamne3070
5 жыл бұрын
Hi Mr.Lewin I really loved the video; it helped me understand a lot of things about resonance in the context of a pendulum. There was just one thing that didn’t make sense to me and that was why the amplitude formula (for a pendulum) showed that amplitude DECREASES as length INCREASES. This seemed to go against my intuition as I would have thought that the longer the pendulum, the greater the amplitude at different applied frequencies and especially at resonance. Why is my thinking wrong? Thank you - great video!
@lecturesbywalterlewin.they9259
5 жыл бұрын
how many minutes into the lecture?
@maxsamne3070
5 жыл бұрын
38:35 minutes in (when you slightly alter the amplitude formula to suit the pendulum). Thank you.
@lecturesbywalterlewin.they9259
5 жыл бұрын
I watched from 37:30 - 39:15 and I do not understand your question. *I then watched from **30:00** to **45:00** and I cannot add to the clarity of this lecture.* I suggest you watch it again
@maxsamne3070
5 жыл бұрын
Yes, it is more of an extension; I am writing a paper on how pendulum length impacts it’s amplitude during resonance. The equation shown at 38:37 suggests that as you increase the length of the pendulum (decrease omega zero), the amplitude, at resonance DECREASES. This didn’t seem to make sense for me, as I mentioned above, because I would have thought that increasing length, would increase pendulum amplitude (x distance from origin, x=0). Thank you
@maxsamne3070
5 жыл бұрын
Perhaps I can make my question simpler: what units is the pendulum Amplitude in (meters or degrees?) Thank you
@androidedison645
5 жыл бұрын
Opera singer can sometimes break the glass. That's what I saw in some Discover science Channel. But after listening to your lecture and the live demonstration, I very much doubt that.
@Sanjay-so7mk
2 жыл бұрын
walter lewin sir I need your help. 2:20 Your way of solving that differential equation is truly amazing. And I love that either. But while solving for the displacement x, I am trying to solve those using Laplace transform (In the past I used it and I got some weird terms along with original answer like the initial velocity term and sine and cosine in the same solution.). Would you recommend to use it?? Will it affect my solutions??
@lecturesbywalterlewin.they9259
2 жыл бұрын
talk my math with your math teacher
@gyanadityaranveergautam4313
Жыл бұрын
knowledge never goes in vain
@murphy98969
6 жыл бұрын
No one can explain physics like u 💗 and sir u have differentiated equation of amplitude and equalated dA/dw to zero to evaluate w(max) but sir it may be w(minimum) becouse derivative of a function has a derivative equal to zero on two points one max and other minimum plz answeer sir
@anilphiyak9862
5 жыл бұрын
Double differentiate to check maxima or minima
@ArunYadav-bp3ln
Жыл бұрын
Thank you sir for such a awesome lecture ❤
@lecturesbywalterlewin.they9259
Жыл бұрын
Most welcome
@krishnaprasads5155
9 ай бұрын
EXCELLENT CLASS !!! THANK YOU SIR
@lecturesbywalterlewin.they9259
9 ай бұрын
You are very welcome
@MrRkesh
8 ай бұрын
Beste Professor Lewin. Ik heb een vraagje bij 25:13 , er is een nog omega met amplitude Q*F_0/k. Deze omega is lager dan omega_max. Behoort deze omega wellicht ook tot een vd eigenfrequenties?
@lecturesbywalterlewin.they9259
8 ай бұрын
ik gaf dit college in 2004 dat is 20 jaar gelend. Ik kan uw vraag daarom niet beantwoorden zonder ongeveer 20 minuten mijn video te bekijken en daar heb ik geen zin in. sorry - Ik kan U echter verzekeren dat ik geen fout heb gemaakt. groeten
@seanki98
7 жыл бұрын
43:00 the pendulum example, where we let the frequency go to infinity, could we say that the reason here that the phase difference goes to pi as effectively you have a "shorter" pendulum when performing the driven oscillations, and so it pivot about a point in the pendulum itself?
@lecturesbywalterlewin.they9259
7 жыл бұрын
if it helps you OK - it's not accurate though
@alawi0juventus
9 ай бұрын
At 3:20 shouldn’t cos(wt) = real part of (e^jwt) instead of just e^jwt?
@adityayanbhardwaj7131
5 жыл бұрын
Professor, I have a doubt Driven force is written as F = fcos(wt) then could you please tell me what is f in the left-hand side of the equation my teacher told me that it's amplitude but we know F on the right-hand side of the equation is a "force" then f should be force according to the Law of homogeneity in dimensional analysis. Quantities of the same dimensions should be added, subtracted and equated. Being a trigonometric function cosine is dimensionless and F has a dimension of [M¹L¹T-²] and amplitude has dimension [L¹] .. Dimensionally equation is not correct The equation in dimensions: [M¹L¹T-²]≠ [L¹]
@lecturesbywalterlewin.they9259
5 жыл бұрын
F=fcos(wt) when cos is 1, then F = f when cos is --1, F=--f, when cos is zero, that F=0
@tsehayenegash8394
5 жыл бұрын
i would like to your nice presentation but how cancel the sin and cos term
@mathwithgen-z5854
2 жыл бұрын
When he makes a mistake, I get so confused, then he corrects it and I get so exited that I wasn’t the one who was wrong
@Suseenthar1
6 жыл бұрын
How was the difference in the omega value(resonant frequency) calculated?
@rohanjain5384
4 жыл бұрын
sir can you tell about instaneous power of the driven oscillators
@seanki98
7 жыл бұрын
professor, for (3:40) you assert that the driver and driven frequency have to be the same as the "ultimate solution." (4:26) Is this "ultimate solution" referring to specifically the steady state solution? In that case, is the two equations that you have written down at (16:00) the steady state itself? I presume so. Essentially, are we uninterested in what initially happens to the system before it settles down? I know these are very obvious questions, but I just wanted to be absolutely sure. Also, is there a formula that tells you what happens before we let t go to infinity: like a general formula that tells you what the system is doing, and we can obtain the equations on the blackboard at (16:00) by taking the limit as t-> infinity?
@seanki98
7 жыл бұрын
we know it is steady state because you made the assumption that t->infinity the moment you wrote down that the angular frequency of the solution z has the same w as the driver, correct?
@lecturesbywalterlewin.they9259
7 жыл бұрын
The steady state solution of an oscillator driven with frequency omega will ALWAYS be omega.
@Cirius9
3 жыл бұрын
First time watched a 1 hr video and feeling like it was just a 5-10 mins lecture
@mohammedalsaqqa1546
5 жыл бұрын
Prof Lewin, around @30:14 you said that eta is displacement "not a force", however, when your hand changes direction, there must be an acceleration due to the change in the direction of the velocity of your hand, in other words, the motion of your hand does exert a force on the object! Can you please clarify this for me, it is confusing
@lecturesbywalterlewin.they9259
5 жыл бұрын
I watched at 30:14. My lecture is x-tal clear, I cannot add to it.
@atikaurfa4731
Жыл бұрын
very great explanation. but, i don't understand where did the -kx go in 34:25?
@lecturesbywalterlewin.they9259
Жыл бұрын
I cannot add to the clarity of this lecture
@canned_heat1444
6 жыл бұрын
Hi, I forgot what the Q was, I thought it was quality of the system but I must be mistaken cause when I looked it up I didn't find it. What is the Q? Thanks
@lecturesbywalterlewin.they9259
6 жыл бұрын
yes Q is called the "quality"
@muzzammilb3437
2 жыл бұрын
Sir, why do you have some food item on right of your shirt in every lecture I see??
@sherzadakhan3191
7 жыл бұрын
Dear professor how do you know in advance ( with out any detail mathematical procedure) that the solution of differential equation must contain a delta term and this delta term must represent the phase difference between the driver and oscillator. Further more why the delta term is subtracted not added in the exponent ? thanks a lot for answering previous questions.
@lecturesbywalterlewin.they9259
7 жыл бұрын
The most general soln must contain a phase angle. Just like the most general soln for F=-kx must contain a phase angle. If you leave this out, in general you will not be able to meet the initial conditions.
@surendrakverma555
2 жыл бұрын
Excellent lecture Sir 🙏🙏🙏
@lecturesbywalterlewin.they9259
2 жыл бұрын
Thanks
@suhanipathak1689
7 ай бұрын
I have a question sir. At 00:03:05 the term was F/m cos(wt), we changed it to F/m e^(jwt). However isn't the expansion of e^(jwt)= cost(wt) + sin(wt)? How did we introduce the term sin(wt)?
@lecturesbywalterlewin.they9259
7 ай бұрын
changing to powers of e^j simplifies the math. At the end you only use the real term (thus the cos term)
Could you explain why the Amplitude, A=F(dot)/k when the frequency of the driving force tends to zero? When the direction of the driving force becomes constant(when the driving frequency tends to zero) does the equillibrium position shift?
@lecturesbywalterlewin.they9259
7 жыл бұрын
The answers are in my lecture
@gamerboyss5310
3 жыл бұрын
@@lecturesbywalterlewin.they9259 hahahaha
@shreyashmeshram5351
6 жыл бұрын
Sir in my book it is given that maximum energy transfer takes place when system is in resonance,........so for a vibrating system in resonance must be having the largest amplitude.......so here we don't have maximum amplitude..,...why????
@shreyashmeshram5351
6 жыл бұрын
At 24 mins
@yashovardhanjha9274
5 жыл бұрын
My professor had given same example of shaking you for steady state . I think he had watched out this lecture first
@rishabhjain3705
5 жыл бұрын
Hello Sir, Your lectures on classical mechanics, electromagnetism and oscillations and waves are all great !! . But why did you never lectured on thermal and modern physics ?? Or you did lectured but they were not recorded ? Thank you.
@peakaimers3469
3 жыл бұрын
Nice lesson...what is Fo
@_N0_0ne
2 жыл бұрын
Thank you kindly ✍️
@veronicanoordzee6440
10 ай бұрын
Hi Walter, is it possible that the damping factor b is a complex number too?
@curious_ben
5 жыл бұрын
Why, when assuming a a steady solution to the complex diff euqation, do we not assume that the amplitude (A) will be the same as the amplitude of the driving component (F0/m), just as we did with the frequency (w) ? Thanks in advance
@lecturesbywalterlewin.they9259
5 жыл бұрын
>>>will be the same as the amplitude of the driving component (F0/m)>>> how many minutes into the lecture?
@watermanOIT
6 жыл бұрын
I'll take mine sunny side up!
@mohitvyas7727
3 жыл бұрын
I have some question in mind :- 1) how we get etta÷2 when two springs of spring constant k is in parallel to each other Yaah I got that k(net) =2k but how we got Etta÷2 is still a mystery for me
@lecturesbywalterlewin.they9259
3 жыл бұрын
apply Newtons laws! It's that simple
@foriitmitaspirants1131
2 жыл бұрын
@@lecturesbywalterlewin.they9259 How k(net) = 2k ? Foce to distort 1 unit length of L length spring = k . Force to distort 1 unit lenth of 2 L lenth spring = k*1/2 (for half part i.e. L length) + k*1/2(for other half part i.e. L length) = k
@AryanKohli-hkscx
3 жыл бұрын
He is awsome
@АзХашми
6 жыл бұрын
What does the delta in the 1st proof stand for?
@kanishkkapoor207
3 жыл бұрын
sir are ur lectures helpful in NEET? and sir your lectures are super amazing
@sahilsudesh4332
3 жыл бұрын
These lecs are out of syllabus even for JEE ADV, Let alone Neet 😂😂..I am a first year Btech Undergrad watching this video.
@abhishekrbhat8919
3 жыл бұрын
@@sahilsudesh4332 MOW course? Even I am first year
@swarnavabag7321
5 жыл бұрын
Thnx prof.......
@fate_map1592
3 жыл бұрын
In the pendulum problem, we arrived at an expression for the periodic force acting on the pendulum. However, is there any other way of directly arriving at an expression for the periodic force?
@lecturesbywalterlewin.they9259
3 жыл бұрын
try it
@physl2787
5 жыл бұрын
Sir how you write cos(wt)as a e^iwt. Because according to eulor e^iwt=cos(wt)+isin(wt)
@lecturesbywalterlewin.they9259
5 жыл бұрын
only the real part of e^iwt gives you the magnitude and that's the cos
@raghulsankar1153
5 жыл бұрын
sir by euler's formula you have expressed cos(wt) as an exponential but that would also add a isin(wt) and wouldn't that be wrong . you've introduced it around 3.00 of the video
@lecturesbywalterlewin.they9259
5 жыл бұрын
yes e^(jwt)= cos(ωt) + jsin(ωt) I suggest you keep the sin term in your eqs. Near the end the result must be real and that's where you end up only with the cos term
@raghulsankar1153
5 жыл бұрын
@@lecturesbywalterlewin.they9259 ohhh . Thank you so much sir :D , I'll rework the whole thing !
@babuj6949
7 жыл бұрын
Regarding air track demo: In 8.01(lecture 31), you demonstrated the flipping of arrow (drive) at just above the resonance. but in this lecture's air tract demo, there is no such flipping. once omega is higher than omega zero, due to square root in amplitude equation, amplitude can be positive or negative. which value we have to prefer and on what basis we have to prefer. In 8.01(lecture 31), flipping occurs due to the negative values of amplitude above resonance frequency. can you shed some light in to this?
@lecturesbywalterlewin.they9259
7 жыл бұрын
how many minutes into the lecture?
@babuj6949
7 жыл бұрын
sir, in current lecture from 53.03 to 53.35 min, and in 8.01( lecture 31), from10.22 to 10.30 min
@lecturesbywalterlewin.they9259
7 жыл бұрын
you have to be a bit patient and wait till transient phenomena have died out. At 53:40 the two are perfectly out of phase. No need for me to look at 10:30.
@pavankalyan-zi6ei
2 жыл бұрын
Sir at 1:04:44 , you mentioned that beat phenomenon occurs cause of same frequencies but in beat phenomenon frequencies should be different and amplitude should be same right?
@lecturesbywalterlewin.they9259
2 жыл бұрын
I watched at 1:04:44. Have you ever watched a movie where a car goes forward but the wheels rotate backwards? That's a beat phenomemon between the frequency of the images (1 image every 1/16 of a sec) and the motion of the wheel. I have a record palayer. It comes with a disc with black lines on it. You place the disk on the rotating table and you use flurescent light (fixed frequency 50 Hz or 60 Hz). You can now adjust the rotation speed of the turn table so that the black lines stand stil. *That too is a beat phenomenon.*
@pavankalyan-zi6ei
2 жыл бұрын
@@lecturesbywalterlewin.they9259 Not at all Intitutive 😅.
@MrAbhinavgour
3 жыл бұрын
Can somebody explain why amplitude is half of the driver ?
@lecturesbywalterlewin.they9259
3 жыл бұрын
question unclear.
@ZoyaKhan-we8zi
7 жыл бұрын
I want a lecture on damped oscillation but i am using a different book (waves & oscillations by M.H Musaddiq). What should i do? Its very different and difficult
@lecturesbywalterlewin.they9259
7 жыл бұрын
most college physics books cover this subject in the same way. 8.03 Vibrations and Waves by Anthony French CRC Press ISBN 9780748744473 8.03 Electromagnetic Vibrations, Waves and Radiation by Bekefi and Barrett. The MIT Press ISBN 0-262-52047-8
@ZoyaKhan-we8zi
7 жыл бұрын
thank you sir
@shinglau9323
8 жыл бұрын
At 10:44 ,Can the chosen frequency of the driven force be a initial condition in some sense?
@lecturesbywalterlewin.they9259
8 жыл бұрын
You can always choose a frequency, but your solution will then have a transient component which wil ultimately die out and after that you will have the steady state solution. .
@gugax10
7 жыл бұрын
Sir, wouldn't have a minus in the equation of tg of delta, or wouldn't be omega squared minus omega zero squared in the upstairs? (11:49). I've replicated the deduction and I checked in my book, and it does have, at least I that's what I think so.
@lecturesbywalterlewin.they9259
7 жыл бұрын
at 11:49 everything on the black board is correct.
@gugax10
7 жыл бұрын
Ohhhh, I've found my mistake. Thanks.
@rjkhaj
5 ай бұрын
thnk you sir
@jbkamehameha
5 жыл бұрын
Hello, I have found this website on Richard Feynman's classes when he was teaching at CalTech : www.feynmanlectures.caltech.edu/info/ In the Exercise section, there is a problem dealing with the forced oscillation of a pendulum : www.feynmanlectures.caltech.edu/info/ When you look at the solution (winner of the Feynman Lectures Exercise Challenge), it is said : "Now we know from the problem that the system reaches a steady motion, and we argue that the steady motion, to be steady, has to be in phase with the sinusoidal motion of the pivot point that is forced to oscillate " This statement seems to contradict the fact that at the resonance frequency, the two signals should be out of phase with an angle of PI/2. Does anyone know what I could have missed out here? Thank you for your help. Best regards, JB
@samas69420
3 жыл бұрын
if the driving frequency goes to +inf, tan(delta) goes to 0, ok, but why we say that in this case delta goes to pi and not for example -pi or 0?
@mohitvyas7727
3 жыл бұрын
There is a some sort of mistake in your calculation and this error is causing you problems Pay attention:- If driving frequency is supposed to be +infinite then tan (Delta) will be - 0 not 0 . Yaah minus before 0 doesn't make any sense but here it is important cause it will lead you to know that in which Quardent tan is minus and where we got tan = 0 soo in the end you will get to know why we take del= pi not 0
@mohitvyas7727
3 жыл бұрын
I hope you get it what I am trying to explain.
@mohitvyas7727
3 жыл бұрын
At 47.26 Can you please tell me how we got etta÷2
@hafizmuhammadahmad5955
4 жыл бұрын
Thanks you Sir
@shivikarana5874
3 жыл бұрын
At what age or year of my bechlor i will understand this because it is hard to understand i dont why is am i a slow learner or i dont know this maths
@mohitvyas7727
3 жыл бұрын
What are you currently studying? I mean you are in college or in school till now?
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