Пікірлер

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  @Param-h5x14 сағат бұрын

  I am a JEE aspirants and i solve this problem back to few weeks ago..and it was just about 2 minutes 😅

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  @Param-h5x14 сағат бұрын

  I am a JEE aspirants and i solve this problem back to few weeks ago..and it was just about 2 minutes 😅

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  @lw6421Күн бұрын

  For the ship question would the total vertical distance be 4A because the ship has to go up to the highest point (A), come down (A), go to the lowest point (A) and then come back up (A). or is it just 2A because that’s the distance from the highest to the lowest point?

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  @zhelyo_physicsКүн бұрын

  correct! : )

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  @lw6421Күн бұрын

  thank you :)

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  @filipszl7604Күн бұрын

  Chuj mnie przeraża

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  @MustafaKhamees-g9dКүн бұрын

  Can I have a pdf please?

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  @zhelyo_physicsКүн бұрын

  sorry only the videos are available I'm afraid

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  @methulidulanima53442 күн бұрын

  Thank you !

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  @zhelyo_physics2 күн бұрын

  Anytime!

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  @mexxitamusic2 күн бұрын

  This guy is a mix between Ned Flanders and Captain America

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  @zhelyo_physics2 күн бұрын

  haha I'll take that! : )

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  @ALEXJEFF-rc3id2 күн бұрын

  Hello sir, I think there is a mistake in this video. Percentage difference is equal to difference/ average of 2 values. But the formula used in this video is for percentage error!

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  @zhelyo_physics2 күн бұрын

  it made be a different terminology used in different courses. This is definitely the formula for percentage difference. Hope this helps!

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  @aadih.n34384 күн бұрын

  Hello sir, quick question Do we use the modulus of the change in energy for 8.58 as the change in energy would be negative, thanks a million these videos are so useful

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  @zhelyo_physics4 күн бұрын

  There is no standard convention sadly for this, but the modulus will gave the correct value each time and would also get rid of any problems which would not make sense - e.g. negative frequency/wavelength. Thanks for the kind words!

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  @danielchard39265 күн бұрын

  Nah bad

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  @therealspixycat5 күн бұрын

  How close must be the photon in or to excite the elektron? The number of excited electron is promotional low when the diviation allow is very very small

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  @zhelyo_physics5 күн бұрын

  interesting question, I don't actually know as you'd need to used advanced quantum mechanics to answer this well, which makes your question very interesting. I think the classical analogy of thinking of the electron as a little sphere and the photon as a travelling particle of light cannot be applied well to understand this. I am not sure if there is a classical picture of this (please correct me if I am wrong and missing something). Very interesting question!

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  @yoshida_chad23935 күн бұрын

  Hey i am unable to find the linked papers, can you please specify.

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  @zhelyo_physics5 күн бұрын

  the links seems to have changed for the problems, but here they are: problem: ipho.olimpicos.net/pdf/IPhO_2007_Q1.pdf and the solution: ipho.olimpicos.net/pdf/IPhO_2008_S4.pdf Just noting that these are not research papers but problems from the international physics olympiad. Hope this helps!

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  @yoshida_chad23934 күн бұрын

  @@zhelyo_physics thanks for replying after 2 years i'll definitely check em out

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  @yoshida_chad23934 күн бұрын

  @@zhelyo_physics hey i just gave a look at the solutions but they are not the solutions for the same set of problems in the video though i have found the link and would like to share the same for the future viewers ipho.olimpicos.net/pdf/IPhO_2007_S1.pdf

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  @prith79005 күн бұрын

  Hey just started A2 levels and this is such a great resource. thank you so much for all your help

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  @zhelyo_physics4 күн бұрын

  thank you so much for the comment! Very much appreciate it!

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  @kelvin312725 күн бұрын

  These problems feel SO satisfying to complete, after putting in the effort to understand and break it all down. I find putting in the effort is the hardest part, but every time, it's worth every bit I put it in. Many thanks to you mate, for doing these videos! They're really really invaluable

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  @zhelyo_physics4 күн бұрын

  Thank you so much for the comment! It's super motivating to read these comments. I will be solving a lot of olympiad problems this upcoming year! Stay tuned : )

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  @sanjeevambalam3155 күн бұрын

  How did you suddenly make dm negative? In your equation above you assumed that delta m was positive when applying conservation of momentum, as you wrote that the rocket mass of m+delta m splits into two parts.

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  @zhelyo_physics4 күн бұрын

  excellent question - we didn't really assume it was positive. We just didn't give it a sign. In the next part I assumed that the mass would be decreasing i.e. it would be negative if so. You could still not assign a sign though and carry through the working out without the negative sign. I hope this helps!

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  @ayoa64216 күн бұрын

  I'm confused, isn't Charles' law the law of volumes? So why are you talking about pressure?

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  @zhelyo_physics4 күн бұрын

  Hi, I have not actually covered Charles' Law in this video. Charles' Law states that V/T=constant, the pressure law is another variation of pV=nRT when the volume is constant and the amount of substance is as well. Hope this helps!

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  @krish-ut9de6 күн бұрын

  you guys look like brothers!!!

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  @beato.7777 күн бұрын

  But does N = mg . Cos 15...? I have been trying to do an exercise abt this topic thinking it does, but it gives me the wrong answer everytime lol :(

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  @zhelyo_physics4 күн бұрын

  it does in this particular case. If you link the problem I might be able to have a look at it, my guess is that it may be asking something different. This is for the case of circular motion at an angle. Hope this helps and good luck with the problem!

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  @crystaljuta80817 күн бұрын

  You're saving lives bro 🙂 thank you

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  @zhelyo_physics4 күн бұрын

  thank you very much for the comment! very much appreciated!

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  @sakhamurithanmai44429 күн бұрын

  sir i have a strong passion to do tough physics problems and on physics itself but i am a student from an indian college who took computer science as a degree but i want to crack international physics olympiad is it worth investing my time on this exam or i just have to focus on subjects of my degree

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  @zhelyo_physics4 күн бұрын

  mmm I think the problems are great for your understanding but I'm pretty sure the Olympiad is for high school physics students only. Knowing how to invest your time is tricky though, if you are considering a switch to a physics degree I recommend it.

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  @sakhamurithanmai44424 күн бұрын

  @@zhelyo_physics I have checked all the eligibility criteria sir my age is still 17 and I still have two years of time for exam before I loose eligibility

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  @muhammadfaizanalibutt46029 күн бұрын

  Does the natural differ based on how or how much we initially disturb the system

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  @zhelyo_physics9 күн бұрын

  interestingly, no, the frequency is independent of the amplitude. Excellent question!

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  @ridhwaanfatehmamode556011 күн бұрын

  Thank you for adding subtitle❤

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  @TrishaLsg11 күн бұрын

  Hello sir, would you mind if i ask what software do you use as whiteboard? 😮

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  @zhelyo_physics11 күн бұрын

  Sure! It's a free software called Microsoft Whiteboard

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  @TrishaLsg11 күн бұрын

  @@zhelyo_physics great! Thank you so much 😭✨

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  @radiacia_351111 күн бұрын

  please solve more bulgarian physics olympiad problems

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  @zhelyo_physics11 күн бұрын

  Will do!

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  @radiacia_351112 күн бұрын

  I'm Bulgarian and I screwed up on my choice of school, and it didn't help that I had no idea exactly how the system worked. I am in a landscaping паралелка (think of it as a class of students who study a special subject in my case landscaping architecture and that class is part of a specialized school, in my case architecture and geodesy), when I actually wanted to do math and physics but I hadn't realized it at that point so I went with something "safe". If i had gotten interested in math earlier on, I wouldn't be in this situation where ill study things that i basically dont care about, so over all; get interested in math as soon as possible ao you don't waste time!

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  @zhelyo_physics11 күн бұрын

  Здравей! Never too late to pursue what you want: ) Good luck in the future, you can pursue maths and physics in the future and do well!! Remember to enjoy it: )

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  @queenjihan200712 күн бұрын

  E= mc^2 E=? M=? C =? What's the answer?😊

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  @HowardWU-ck9xz13 күн бұрын

  when you calculate the percentage uncertainty, you should multiply 100% instead of 100.

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  @zhelyo_physics13 күн бұрын

  Hi it's essentially the same way of writing it out. Both would be accepted.

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  @HowardWU-ck9xz13 күн бұрын

  @@zhelyo_physics i dont think so. 100% is 1. If you write down 5÷20×100 without any explanation, the result can only be 25 but never 25%. You can say it is a habit or a trick to make calculation easier, but it is mathmatically wrong. thanks for your reply anyway.

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  @zhelyo_physics12 күн бұрын

  Think of the percentage as a unit at the end, at an A-Level exam you would not be marked down for it : )

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  @Deepthinker461713 күн бұрын

  Sir, I have a doubt that has given me a headache. Sir, the non-linear dynamics and chaotic systems physicists talk about, these are higher level physics and maths concepts, right? I am in 11th grade; are we taught these concepts or not, or are we only taught about simple systems with some assumptions so that the system does not become chaotic, like assuming friction is not present or gravity is constant everywhere? Am I correct, sir?

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  @zhelyo_physics13 күн бұрын

  excellent question! They are the most interesting ones!! Generally you have to solve non-linear differential equations for this via tricks if analytical solutions exist or you use numerical method. Have a look at how interesting projectile motion becomes with air resistance here: kzread.info/dash/bejne/a3-qz7uic9PAcrg.html

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  @Deepthinker461713 күн бұрын

  @@zhelyo_physics What is that 😂😂💀 I am in 11th dude and preparing for jee advanced and you have sent me University level question video 🗿. It means that the problems we deal with are non chaotic and predictable under some assumptions ? Please reply brother 🙏 Like when I get an equation like x=t²-4t+5 And we have to differentiate it .

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  @MDRomanMia-ov1ge15 күн бұрын

  From Bangladesh 🇧🇩🇧🇩

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  @zhelyo_physics14 күн бұрын

  thank you for the comment!! Hi to Bangladesh!

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  @niteshnelson861815 күн бұрын

  you always have the perfect videos man

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  @zhelyo_physics14 күн бұрын

  thank you so much for the comment!

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  @kleinzak843715 күн бұрын

  Best explanation with an example as well. Bravo and THANK YOU! Good job!!!!

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  @zhelyo_physics15 күн бұрын

  Thank you so much for the comment!

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  @user-gw3wl6nn1k15 күн бұрын

  can u do esat guide like this too?😊

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  @zhelyo_physics15 күн бұрын

  Currently working on it, a lot of the theory will be applicable as well : ) stay tuned this summer!

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  @user-gw3wl6nn1k13 күн бұрын

  @@zhelyo_physics thank you so much, I honestly find you to be the most useful Physics KZread channel in terms of high school academics. But I hope it could be pretty soon, as I got my exams in approximately 3 months haha. Appreciate your work!

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  @FizOlimp16 күн бұрын

  My brain exploded when I saw the 'Circular Motion Question'. Not because it'd be hard, but because I solved half of a similar problem of the Finals of the 73. National Polish Physics Olympiad. In addition I had come up the idea a few months before the Finals, so it was incredible feeling. What is more, even barely nobody had used calculus, I thought I should've explain my concept of inertia energy (kinetic energy needed not to stay behind with ratating system?) using analogy with string energy.

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  @zhelyo_physics15 күн бұрын

  Such a great question! My instinct was to assume omega is constant with respect to time but then you realize the moment if inertia changes with time. Thanks for the comment!

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  @abi451316 күн бұрын

  Love form srilanka

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  @zhelyo_physics16 күн бұрын

  Amazing, thank you for the comment!

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  @liza.5617 күн бұрын

  Sir plsss one for an edexcel international😭i have exam on october

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  @Arnav188317 күн бұрын

  Please make a video on which books you recommened to solve for olympiad prep.(I know you recommend HKR but its very basic, so some advance level book recommendations would help)

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  @zhelyo_physics17 күн бұрын

  for mechanics - intro to classical mechanics : ) by Morrin

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  @sv360_18 күн бұрын

  thanks for the video sir can you do one on the new ESAT entrance exam for cambridge and imperial that is used from engineering?

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  @zhelyo_physics18 күн бұрын

  Coming up over the summer as well! They now have a sample exam on the cambridge website by the way, some very good questions on there.

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  @sv360_18 күн бұрын

  @@zhelyo_physics ok thank you sir!

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  @zhelyo_physics18 күн бұрын

  @@sv360_ anytime!

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  @zhelyo_physics18 күн бұрын

  Hope this video is useful! In the run up to the PAT I will be running live preparation classes. If interested, join in here: zphysicslessons.net/physics-tutoring

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  @MKamiya19 күн бұрын

  THANKS A LOTT

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  @zhelyo_physics19 күн бұрын

  anytime!