I tried the TOUGHEST Physics High School Exam Question

[@zhelyo_physics]

So what question should I try next? 😀 P.S. I am already working on a modification of this question. I think it's time to introduce an initial push and a frictional force into the dynamics of the system.

[@mangomanlassi7779]

nooooooo not friction

[@zhelyo_physics]

@@mangomanlassi7779 😂😂

[@samuelrojas3766]

What about some problems from IPhO 2022 or APhO 2022?

[@mangomanlassi7779]

@@zhelyo_physics 😂😂😂

[@shmkrar1153]

Yes, Dynamics! I too wanted to analyse the dynamics of this system

[@infintzgaming9458]

Note: JEE ADVANCED is given by high school students at 17 year age

[@44yash60]

f yeah man.. it's tough

[@Horizon24129]

17 to 18

[@srinathkollur7534]

That too there is a time limit to solve most of the questions. Can't stuck on one question...

[@saritayadav9200]

Aa gaye sympathy lene

[@LakshyaVatsa]

​@@saritayadav9200i think theres nothing wrong to take sympathy from others l. Considering jee is a very hard and competitive exam so the constant well-being of the mind is very much needed. Moreover ppl should take pride in even preparing for this exam.

[@haokipiit]

Everytime i see this question, brings back memories of JEE16. I felt the physics paper was very tough, i couldn't clear JEE Adv that year but I did it the following year. Try and try again, a little motivation for future aspirants.

[@zhelyo_physics]

well said!

[@Hehehe-sv5yu]

Note : JEE 2016 was the toughest jee exam in history..!

[@44yash60]

i love how u explain ur thinking process while solving the ques. many teachers online dont do that respect

[@zhelyo_physics]

thank you so much! I find that's critical to a video/teaching.

[@Rahuleditz5629]

Literally true teachers on KZbin have even used inertia tensor & 3d vector concept to solve this which is just pointless

[@hariw834]

I gave my JEE in 2002, when we had just one exam, called IIT JEE. I had cleared the prelims. As a candidate from Kerala, where we didn't have dedicated IIT specific coaching, I was at a significant disadvantage to other well prepared candidates, where candidates often start their preps when they are 13 or so. The exam was so tough and questions so incomprehensible, I even slept through the physics portion of the exam, only for the examiner to wake me up. I've never felt so ill prepared and inadequate ever in my life, while giving an exam, a memory that still lives with me. The direct sunlight in my direction, oppressive heat in that classroom and my father coolly brushing my experience without even a hint of anger, those are memories of a life time.

[@itzbroken132]

hey bro , i am a jee aspirant currently in 10th std. just wanted to ask how many hours do u have to study a day to crack jee

[@homingmissile5459]

​@@itzbroken132one of the dumbest questions ever.....

[@kawaki4277]

​@@itzbroken132dont count hrs

[@User65739]

14​@@itzbroken132

[@prav2568]

Hey man I'm also from Kerala and on my way to write the JEE, I feel like if you had the time to highlight your life from that point till now (I don't want it taking a lot of your time), it would help me a lot and give a few insights. Like hearing from a wise man! I don't care much about the exams itself just how your life has led upto now

[@JEE322]

Another thing about this question is that you can't randomly jump on options to check them, have to go in sequence.

[@zhelyo_physics]

completely agree!! I think B being SO close to the real answer as well is tricky. Luckily I think a common mistake would be to calculate the total angular momentum with respect to the z axis which still produces a wrong answer I think. I need to check for d the answer you get if you add the two components to see if it still gives a wrong answer. But yeah... on some of these, you are doubting them until the last second!

[@roadrash999]

The sequence is totally different on different paper sets (to deter cheating). So you can absolutely jump to options, no reason why not.

[@Inserthandle-ff6jw]

You're supposed to skip this question

[@RuturajDahiya]

That's the spirit of a real JEE ASPIRANT

[@Rahuleditz5629]

Seriously this is the shortest & the most precise solution for this question on the whole KZbin 😮

[@zhelyo_physics]

thank you so much for the kind comment. I very much appreciate it.

[@Rahuleditz5629]

@zhelyo_physics but sir I wanted to ask a question. In the second part where we have to tell the angular momentum of the COM of the assembly about the point O , instead of using I×angular velocity Can't we simply use mvr for the point mass rotating about point O in a circle ??

[@GaurangGamerz]

​@@Rahuleditz5629 Let me know if you get a reply from him 😅😊

[@ar18op1]

No formula sheet, log table, calculator or anything you can think of, we just have a piece of paper. 17/18 year olds take this test. Also you should be able to solve such questions around in 3 min to even hope to try all of them.

[@akhil73944]

Lodu adv hai, jo hone jaisa lagta vo karo jo na hone wala lagta chhod do. On avg a decent student will be spending around 5-8 mins/ques.

[@PrathyushHegde-ns9ue]

bro you should not solve such type of questions in jee advanced paper these questions are made to leave

[@PHOENlX1734]

@@PrathyushHegde-ns9ue that's actually true....

[@Mir5u]

​@@PrathyushHegde-ns9ue brother, there are definitely some out there who solved this question. That's what a test meant to be, you can leave a question but you can't expect to be topper of the test.

[@TranscendentalTranquility]

​@@Mir5ueven AIR 1 skipped it. So... Yes skip it.

[@vishaldebroy3532]

Even my seniors from IIT yet not able to even understand this question lol

[@Aman-b5k]

Thank you so much mate, for solving this.few months later I'm going to appear 2025jee so this concept would be clear for me with this video. ❤love from India 🇮🇳

[@zhelyo_physics]

thank you so much for the comment!

[@aritrayt1089]

Good luck

[@rakeshpatel5043]

Where are you from?

[@SSedits_xd]

The Professor who made thus Problem💀

[@Hehehe-sv5yu]

Yeah sir....i am the professor who made this question and I see it my most toughest question. Appreciate you all 💗

[@Aditya-op1ql]

we're expected to solve this in 3-5 min at 17-18 with the pressure of the hardest engineering entrance exam in the country. edit : for anyone unaware and reading this, no memorizing formuale is not sufficient for this exam. having basic knowledge of all concepts of all 3 subjects (maths, phy and chem - which is around 70 chapters across 11th and 12th grades) will be enough to maybe qualify it (unless the students giving the exam get really lucky and get a rather easy paper)

[@user-i-a-z5]

And the one to blame is our grandfather's and someone before them, I mean, Were they really dumb enough to make 5 to 10 children, They were barely able to afford their own food, I mean how dumb can a Human be, It's really simple to understand that more kids = poverty and competition, I hope the Indian population will go down like China in the future, Indians are stucks in physics numericals, We don't do anything creative at all, No research, No R and D, Just book worm

[@VihaanChrungoo-nw7ji]

you are not expected to solve that question in 2-3 min that question is meant to be left

[@Aditya-op1ql]

@VihaanChrungoo-nw7ji depends on the student's capability

[@rituraj1135N]

Salute to the man who made this question...he has excellent intelligence 🤯

[@dakshpatil8201]

Yup we do have to memorise moment of inertia of rods from end hinge, mid hinge, discs,rings, cylinders

[@revathibodapati9066]

or you can derive them during on your own by integration which will help you remember them easily as opposed to rote memorization

[@PrakritiNathSarkar-vc6kf]

Actually this is not the toughest question bits actually really hyped question The main thing about this questions is that angular velocity vectors and its components and instantaneous axis of rotn Jee has asked tougher question on fluid mechanics and electrodynamics you can have a look on them

[@zhelyo_physics]

I'll have a browse, thank you!

[@AbhilashBehera-v1b]

Yeah true, this q is soo overhyped

[@PHOENlX1734]

True one question with mixed concepts of fluid and electrostatics was really tough

[@Chinmayanandunk54Nk]

This question is hyped so much jee adavance questions on fluids are bit difficult than this one tbh

[@PHOENlX1734]

true lol. I remember one question with mixed concept of fluid and electrostatics it was hard asf way harder than this

[@ForceMid]

In your right triangle with Wz and Wo you didn't consider carefully where the right angle should be. There was another possible choice. In particular it is not true that Wo L = Wz 5a. You can see this by looking at the triangle with sides L, a, 5a (hypostenuse). Wo L = Wz 5a is stating that the center of the disk of radius 'a' moves the same distance per unit time as the point in contact with the ground. This is clearly not true as center of the disk moves around a circle of smaller circumfrence in the same time the contact point moves around its circle. The correct statement is that Wo L = Wz (the radius from the z axis to the center of the disk). I think a clearner way to calculate this is using with the r the center of mass radius and v it's velocity. Here v = Wz (radius to z axis). If you do this you will get an answer that is in agreement with the correction I propose. (radius to z axis)/((9/5)L) = cos(theta) = L/(5a) so (radius to z axis) = (9 L^2)/(25a) = 9 24a/25 v = Wz (radius to z axis) = (W/5) (radius to z axis) = (W/5) (9 24a/25) = 9 24aW/125 r = (9/5) L m r x v =m r v = 5m (9/5) L v = 9m L 9 24aW/125 = (24/25) (81/5) m sqrt(24) a^2 W Your answer is off by a factor of 24/25. Note that anotherr solution on the web to this problem makes a similar error: kzbin.info/www/bejne/iqm7pqJvqtCJrrc. At 9:57 the velocity refered to is not aW but 24/25 of that value. The error is basically the same. The center of the disk is not moving at the same speed as the point of contact.

[@rosschristofferson6084]

Correct solution is here: kzbin.info/www/bejne/n5i3qWuMbNx2qtksi=JLmd2DIvd2vrN6pv

[@rosschristofferson6084]

kzbin.info/www/bejne/n5i3qWuMbNx2qtksi=JLmd2DIvd2vrN6pv. Has correct solution

[@hegdesughosh6559]

You should take 3 minutes to solve this.That's a requirement in JEE Advanced

[@aadityasinhchauhan7300]

Sir you explained very well, thank you ❤

[@zhelyo_physics]

thank you for the comment!

[@ashwinikokare1571]

Hey bro ! Loved your enthusiasm while solving that question and making us understand at the same time. Really appreciate your efforts

[@zhelyo_physics]

thank you so much! very much appreciated!

[@bhargave6088]

The word toughest doesn't only mean hard to solve It also mean It takes 16min to solve

[@zhelyo_physics]

definitely more for me!

[@BishalVtry]

You're wrong. For moment of inertia you used formula I = mr² in which you took r as the distance of centre of mass from O. But you can't take r as a location of centre of mass, here r is the RMS distance of all the point mass from O which is also called as Radius of Gyration about the given axis. Reason: In equation I = mr², the term r² is not linear so you can't use the location of centre of mass. If I = mr, then you can use r as a location of centre of mass because r is linear, but in other case you can't use r as a centre of mass. For example, Consider a uniform bar of length L. The location of centre of mass of bar is exactly at centre(middle) of the bar. Let's take the axis Y that passes through centre of mass and perpendicular to the longitudinal axis of the bar. The moment of inertia about Y axis is (mL²/12). But if we use a formula I = mr² considering r as a location of centre of mass from the axis Y then r = 0 because the centre of mass lies at the axis Y. Hence, I = mr² = 0, which is wrong. Therfore, we can prove r cannot be taken as location of centre of mass

[@ForceMid]

There is a theorem about the angular momentum of an object being the sum of the 'angular momentum of the center of mass' and the 'spin' angular momentum. This theorem is being used and is what they are refering to in the question when they ask for the 'angular momentum of the center of mass'. This term and it's exact meaning is defined as part of the theorem. As such what you are saying (for instance in your example) is not relevant and what he is doing is correct by the definition of 'angular momentum of the center of mass'.

[@AVIGOOO]

Crazy that youre sipped to solve this in under a minute

[@The_unseen_Content]

G O A T Question of Jee adv History

[@Abhinaytiwari418]

Loved ur explanation ,sir could u solve more question at level of jee advance but not the previous year rather new question from different book which can be at the level of jee advance

[@zhelyo_physics]

Sure! Have a look at this one: kzbin.info/www/bejne/r2jRe3VmgZd2gJo

[@avanthishanmugavelusamy547]

Thank you so much

[@aimlesslad]

I love the way you actually solve it step- wise and paying attention to smallest of details… my teachers think I’m Einstein listening to their guest lecture

[@zhelyo_physics]

thank you so much!

[@JEE322]

11:40 yes sir we have to memorize such formulas

[@zhelyo_physics]

Thanks for the response! Argh, even trickier then, I was looking for an equation sheet in the paper :D

[@mxminecraft9410]

​@@zhelyo_physicsI believe memorizing doesn't make the question tricky tho such memorisation shouldn't be allowed to be asked tbh ( or should be provided in the question itself) it's a sad education system here .

[@comptech5240]

@@mxminecraft9410 u don't need to memorise much. If MOI concept is clear then u can easily understand them as well. Now obviously under the JEE time crunch, remembering such values do help

[@abhishekshriyansh6273]

This is the best explanation😊

[@zhelyo_physics]

Thank you! 😃

[@Kartikeythakur789]

Thank you so much for this fantastic interactive explanation

[@zhelyo_physics]

@@Kartikeythakur789 thank you for the comment!

[@Kartikeythakur789]

@zhelyo_physics thanks sir

[@user379-p7j]

These questions are actually made not to be answered You are supposed to leave it If you go for it you won't have enough time for othet questions

[@Rajbanerjee518]

Thank you i think this is the great solution you have done bro,i can realy understand it very much well❤,,tricky part is very hard,but so funny❤❤❤😂😂,,better than other all solution good job

[@zhelyo_physics]

thank you so much for the comment! Very much appreciated! : )

[@Fvfdrtt3]

You are so smart ,love your content keep it up brother❤❤❤

[@zhelyo_physics]

Thank you!

[@dr.vaibhavsharma]

As a doctor who left physics 10 years ago, it made little sense to me. Idk why I watched the full video. 😂😂

[@deadsouldabest520]

this isnt the toughest question ever in advanced but given the circumstances , like the pressure ur under during the exam , trying to do this would have been next to insanity and it was obviously given expecting students to not even attempt it but yeah it is what it is ig

[@deepssmeow]

This channel is very very underrated!

[@zhelyo_physics]

Thank you very much for the kind comment!

[@akash7152]

Please make a book recommendation video not for any exam but for Physics

[@zhelyo_physics]

Thanks for the idea! Will do

[@zhelyo_physics]

Actually I have used those two extensively: kzbin.info/www/bejne/n5urq39mgqeXntU , kzbin.info/www/bejne/i5Omk5JjfNmLaqc Additionally, Halliday Resnick and Physics by Ohanian is amazing. Just some recommendations.

[@enderman4514]

@@zhelyo_physics halliday resnick just never ends 😭

[@arsh_arora10]

​@@enderman4514for real bro 😢

[@mkrsinfo2859]

your a great teacher who made me (a 9th class guy) understand this whole question from A to Z great things sir

[@beyond2life951]

kam fek

[@mkrsinfo2859]

@@beyond2life951 what is it brother? i forgot to mention that im in a school(sri chaitanya) that has completed 11th class syllabus till COM so thats why i was able to understand this.

[@beyond2life951]

@@mkrsinfo2859 so why are u bluffing that a 9th grader can understand. 9th grader were not teached COM in their school

[@mkrsinfo2859]

@@beyond2life951 bro im in sri chaitanya IPL- batch they teach jee syllabus from 8th actually but i joined in 9th so im learning them now and are you retarded? cuz i literally mentioned that my school completed 11th class syllabus till COM and we having dussehra holidays so we are at a pause

[@LuffyMonkeyd-u8b]

@@beyond2life951I’m in India Narayana. And yes they have taught com in 9th grade and completed rotational mechanics by 10 th class starting.

[@jaykugosenpai9393]

When you calculated the moment of inertia at 5:43 was it like instantaneous? because in the very next second the direction would change! And why didnt you consider the horizontal component of the distance of the center of mass instead?

[@zhelyo_physics]

Good questions! during rotation the magnitude of the moment of inertia should remain constant as the distance 9/5l is not changing during the rotation. I guess the distance l is along the length and considers both the vertical and horizontal components. It's quite a bit easier to treat it this way than to decompose it to separate components to reach the same result, I think! (it's been a while since I solved this question though)

[@Mathslover666]

You explained so nicely mann 👍👍👍

[@zhelyo_physics]

thank you so much!

[@JeeAspirant-j8n]

Jee advance is pride of India and undian students

[@Nothing-w2m7h]

It is not pride but it indicates that india doesn't have many good colleges other than iit,nit

[@Juliette_ferrars]

​@Nothing-w2m7h They are not even in the top 100 engineering colleges in the world. The only reason they are prestigious is because of the competition to get into them

[@JeeAspirant-j8n]

@@Juliette_ferrars atleast we have something to feel proud for

[@kanchanjaiswal5023]

In exam you have 3 minutes to solve it.......

[@vijayalakshmym5115]

Bro for your kind information part C is wrong, you sir took only the angular momentum of spin, but you need take the net angular momentum which is the sum of (L) at COM and angular momentum about COM, so the answer 17ma^2w/2 is an incomplete answer and it would have other terms too. IIT gave the answer also part C as a complement for students as these were all out of syllabus

[@KumarR-bk9zy]

The same question is already asked some other degree level physics exams conducted by ssc

[@RitikGupta-mc3eg]

If your average timing is more than 7 min in phy 9 min in math 4 min in chem kis good bye to your dream iit

[@Sangroula_108]

How did u get 25a^2?? Please explain, someone

[@Kay.31]

time stamp please, then ill explain

[@Sangroula_108]

2:32 ​@@Kay.31pleaseee explain from there

[@HarshJaiswal-ie3un]

6.54 Here i guess the radius is the horizontal distance of centre of mass from the origin, we have to find the horizontal component of distance from origin to Centre of mass, so the angular momentum vector should be vertically downwards. Correct me if I'm wrong

[@sanjughosh3148]

Still remember this question. While giving this exam back in 2016 , i was like holly cow 😅

[@imademedikasurya3917]

I want to ask you about Indonesia National physics olympiad question, where should I sent it to you?

[@zhelyo_physics]

Best way is to leave a comment here

[@almostok692]

At 3:44 you used Wr=V , why can’t we write Wz(perpendicular distance of centre of disc from z axis)= Velocity of centre of disc?

[@amkai2928]

What? What do u want to say? W(omega) is just perpendicular dist×radius of disc.

[@ViralvideoYouTubeSameerHusain]

Wow sir you explained nicely ❤❤❤❤❤❤❤❤❤❤❤

[@zhelyo_physics]

thank you for the comment!

[@ViralvideoYouTubeSameerHusain]

@@zhelyo_physics welcome sir❤❤❤🌹🌹🌹🌹🌹❤❤❤❤❤❤

[@Sujalair50]

Cracked this exam and i am in IIT BOMBAY CSE now 🥰

[@nirodeception]

Do you feel no shame in lying?

[@utkarsh8224]

​@@nirodeception how could you know

[@utkarsh8224]

​@@nirodeception🤡🤡

[@nirodeception]

@utkarsh8224 IIT Bombay ka hota sachme to do extremes hai ek ki agar wo itna brah karrha hai to wo apne profile pe kamsekam ek IIT Bombay College life video ya photo bhi rakhta ya ek shorts hi aur ek dusra end hai ki koi casual IIT Bombay ka banda hai jo ye hai nahi kyuki isne apna account ka naam IIT Bombay rakha hai. Koi 16 saal ka wannabe IITian hai

[@Chromium24-kd5zp]

I'm confused why didn't we consider the centre of mass to be going around in a horizontal circle and why didn't we find out its horizontal distance (9lcosθ/5) from the z axis ?

[@BibhavDas]

Normally we are supposed to skip this question because we cannot give more than a minute or two for one question. Nice explanation though.

[@zhelyo_physics]

thank you

[@Techendant]

I m in class 10 who wants to choose non med. My goal for class 10 is 95% 100/100 in math and science my exam is far from now it is on oct 2025

[@unknownuser.5000]

Bhai tera jee me nhi hoga woh acha baat hai physics me kuch engineer mat ban tu please ❤

[@Ayush-q9u]

You have done a great job by explaining this question. But actually the correct answer is only option (A) .

[@shyamsundar4665]

Should the orbital angular momentum not make an angle with orbital angular velocity because they are not supposed to be parallel for unsymmetrical mass distribution

[@zhelyo_physics]

Hm, I agree, excellent point. My solution treats the orbiting assembly as an orbiting point mass. You can also: Find Lo about by finding the moment of inertia with respect to the z axis of the rotating assembly and multiplying it by ω_z which is ω/5 I don't see an easy way of finding this but I can have a go this week. Let me know if you do before me!

[@samyakgupta5773]

Any alternative way to find w of center of mass, can we use conservation of angular momentum also, might be wrong because I just started studying rotation

[@aneeshkundu1186]

Better to leave this kind of questions in exam

[@vjaykodvara6356]

I was in 2016 batch। Ya thats true

[@shampudey9952]

my age is 16 and I am watching it I said though no one wants to know .😊

[@KushagraNath-o3p]

Really appreciate Your content.I am Jee aspirant. Such questions are tough and may seem daunting but for us its everyday life. The reason is if you look at our solutions they will seem mechanical and robot like. By continous practice the thinking process is memorized by our brain. That is why personally things like PART A can be solved in a few seconds by just imagining the situation. However Part B is much more difficult as it is not a known or seemingly familiar situation. It was actually Removed from the answer key( It doesnt matter whether you mark the option or not) Its been discussed heavily in this video kzbin.info/www/bejne/b6u1pZ-aoLGJhqMsi=KbnLCVvKqaiHzb_5 Also lastly. Dont take the 2 min per question thing to heart. In reality you dont need to solve every question. solving 80% questions with high accuracy gets you and amazing rank. Also to pass the exam you need 30% or so. Paper attempting strategy also involves knowing which questions to skip.( Personally when I attempted this question as a test I marked part A in 30s and after that i realized it was too lengthy. Thus i only spent 1 min in total and gained all 4 marks :) )

[@zhelyo_physics]

This is a super interesting insight. Thank you so much for the comment and the valuable info. All the best and good luck!

[@amaduck2132]

Damn bro. Im in 11th, a jee aspirant... how do i inculcate this 'intuition' of yours ?

[@Mahi-tv7kp]

Moment of inertia of a disc is mr^2/2 not mr^2

[@adityarana13]

Hey Sir I hope you have a good life I also want you to try a question in jee advanced 2017 another question from rotational motion I don't know the questions but it is A twirl in a hand type of question it was hard as he'll and where underrated until you find a small trick of it I want you to figure it out😊☺

[@zhelyo_physics]

Oh! I actually looked at that question yesterday and it looks very interesting : )

[@adityarana13]

Thank you sir for the reply and I hope your next video will have more views because there are many less people in world which love physics and have a value of it

[@zhelyo_physics]

thank you so much!

[@scienceenvironment3008]

It is not solving questions it is just thought base questions it should be done in less than 1 min I know because I am jee aspirant 😊

[@GangstarParadise124]

If this came in Boards exam then 💀💀

[@VishalHaryana001]

May i know where are you from??

[@zhelyo_physics]

sure, I am from Bulgaria but I have been teaching in the UK for many years

[@vaibhavgaming_yt]

@@zhelyo_physics nic3

[@Meyouknowd]

Moment of inertia ???

[@zhelyo_physics]

all explained here if it helps! kzbin.info/www/bejne/n5bRlJiIdtSla5Isi=m13rcXbn1_r7J0h7

[@roopabhat342]

I have always thought that India has obe of the most brilliant people. However India fails to give proper facilities to them due to which, most of them leave India and serve Western countries. PS :- There is nothing wrong with it. Why should such brilliant students live in india when they deserve much more

[@divyanshukumar-cs3fi]

I gave the IIT Jee Advanced 2016 .Indeed it was an amazing experience, fortunately I have cleared that exam and got into the IIT Kanpur.

[@zhelyo_physics]

Well done!

[@BasisthaAnand]

I came here after tom nightmared you with mat questions😅😅😅😅

[@zhelyo_physics]

😂😂 I should have given him this question!! Maybe next year 😁

[@BasisthaAnand]

@@zhelyo_physics yeahh😂

[@GamerX78623]

Its not toughest,Its hard because it was out of syllabus and it is studies in later studies in collese or later

[@abhishekKUMAR-ij7nw]

@riyansaini36 jee advanced does have a syllabus (its present on there website), everything comes from the syllabus , but just very very advanced and mixed concepts

[@Xavierjwbbs]

It's very complicated. That's the reason even best brains never got full marks​@@abhishekKUMAR-ij7nw

[@dhruvchoudhary4143]

but the correct answer given on a jee advanced website is b,d or d

[@Ayush-q9u]

Which Website. I think you did not read the options. The options can be in different sequences. The correct answer is A Or A, C according to the options in this video . C is actually wrong but they gave it the correct . Because to analyse the motion of this system in the exam hall is really tough as it is not in the syllabus. But who did not mark the option C & marked only A is absolutely the most intelligent so they gave full marks to both the students at that time. Now if you want to know more about Option C then you should talk about it with your physics teacher or you can watch SBT physics channel JEE Physics the video is about 1hour long. But all your doubts about it can be solved.

[@Abhinaytiwari418]

Sir can u pls solve this,really like ur solution ,this question is from jee advance 2020 fluid When water is filled carefully in a glass, one can fill it to a height h above the rim of the glass due to the surface tension of water. To calculate h just before water starts flowing, model the shape of the water above the rim as a disc of thickness h having semicircular edges, as shown schematically in the figure. When the pressure of water at the bottom of this disc exceeds what can be withstood due to the surface tension, the water surface breaks near the rim and water starts flowing from there. If the density of water, its surface tension and the acceleration due to gravity are 103kg m−3 , 0.07 Nm−1 and 10 ms −2 , respectively, the value of h (in mm) is

[@Abhinaytiwari418]

It's 2020 paper 1 question 14

[@zhelyo_physics]

thanks a lot! I will have a look!

[@Confused_Askew]

What are your thoughts on the dude who spent 6 hours to solve this exam?

[@zhelyo_physics]

I just saw parts of it, seems like an excellent video.

[@ShrFf]

its just a game of rotational mechanics , general geometry and center of mass

[@techyBOY1412]

To solve this we have 3 MINS

[@Karan_Singh14]

It's is not compulsory to solve this you can leave this type of tough questions Even you can get under 500 rank and can took admission in top IIT Don't hype this exam

[@rishiparashar9d537]

Bro took 8 years to find this question Fun fact: I'm 10 years in 2016 😂

[@Thermodynamics-l3t]

After this question My confidence commit suci..de

[@indianbeast644]

Sir can you also include ray optics from ipho

[@zhelyo_physics]

On the list it goes 😀

[@sumitvishwakarma1075]

This was a question from MIT PHD Physics exam which was done by high school students

[@zhelyo_physics]

Wow has it actually appeared on a PhD exam? I have seen variations of this motion before to study the dynamics/kinematics of this motion before

[@sumitvishwakarma1075]

@@zhelyo_physics yes and that question paper of 2016 was made by IIT Guwahati and there was also an another rotational dynamics comprehension question which was also interesting you should have a look on it

[@sumitvishwakarma1075]

@@zhelyo_physics they do pick some questions from MIT's university's papers like they picked an integration problem from MIT integration Bee

[@44yash60]

@@sumitvishwakarma1075 brother it was made by iit madras

[@Ayush-q9u]

​@@44yash60 Bro 2017 JEE ADVANCE was made by IIT Madras. JEE ADV 2016 was actually made by IIT Guwahati.

[@BBQBeerKars]

How does ANY of this matter in the real world? Any takers?

[@babeji]

if you don't use it in your practical life it doesn't mean it's useless, how do you think without these concepts scientist design new or more efficient machine ?

[@BBQBeerKars]

@@babeji What machine do you think you are referring to? I've a PhD in Finance, that's where I have used most of the calculas, and when I write algorithms used at Hedge Fund companies, it helps get the job done there too. However, before this point, there wasn't ONCE a time when I can confidently tell you I've used Calculas in any shape or form. It is not useless, but it is irrelevant to do MOST jobs though. A Gas Station clerk does not need calculas to operate a POS machine, if that's the machine you were referring to.

[@ThePhysicsWorm]

@@BBQBeerKars SHUT up

[@7m4sushmitakalla65]

Is this system of particles because this answer is similar to that topic

[@RohanKumar-un2mt]

I had already solved this 😂😂. This is a class 11th question. Which was asked in JEE advance in 2016😅

[@parvgoyal7997]

Anyone not in PHD...... Don't try to go at depth of this question. U will end up with no benefit

[@oneshotff2898]

hn bhai😂

[@SwJSnG_IITDelhi]

That's not the toughest Like how we compare a question tough or easy by viewing its %age of students who made it correct out of total students who attempted the exam So there are absolutely insanely tougher ques than this, specially in fluid mechanics and electrodynamics PS: my jee advanced exam in may last week 2025 almost 7months Before I have jee mains exam in January last week Then board exams Then jee mains 2 Then jee advanced 😢

[@理論派の男]

Try Brazil's IME/ITA , especially ITA 2014 , that goes crazy hard.

[@zhelyo_physics]

@@理論派の男 thank you for the suggestion

[@ChildhoodSports]

You made it easy now i am going to study COM then i will try it 😂

[@zhelyo_physics]

Hope your studies go well, thanks for the comment!

[@thefinalsceneismissinggrea6172]

Who ever told you that this is toughest question in jee advanced is a fool nothing special in that question a. simple resolution of anguullar momentum. The most beautiful questions are asked in 90s

[@Zigga.kepler]

I thank God i study Alevel physics and not this🙏😭

[@vatsal409]

It has to be done with in 3 mins

[@vatsal409]

@@tyarivoneI was not meant by that I was just saying we have to do these type of questions within 3 mins

[@SamSung-g1k]

Idk why it is consider as hard

[@Mathslover666]

It was controversial question plus we have to slove question like this in less then 5 mins which is quite hard. Plus the things involved doing the question was out of Syallbus . It's one of the hardest not the hardest one. Maths is the hard one in jee .

[@PYOS_OFFICIAL]

Why are some people saying that your answers are wrong? (Cause I don’t even know who is correct)

[@zhelyo_physics]

Several reasons - some options were changed as 3D rotation was not part of the syllabus - please correct me if I am wrong. Another possible reason - in different versions of the questions, I can see that the answers have sometimes been swapped, i.e. A in the questions shown here may be a different answer. Please correct me if I am wrong on the reasons. As a physics reason, the solution in the video treats the orbiting assembly as a point mass, so it's something to be aware of.

[@sltechhub9161]

This question give us to term test srilanka AL 😂

[@DoraemonMS903-k1g]

IIT Guwahati 🎉🔥😳💯

[@SubhanilChoudhury]

solution of angular momentum about O is wrong

[@zhelyo_physics]

Could you please elaborate why? Thank you.

[@oneshotff2898]

wow got recommended early😂 btw im also appearing on 2025 jee few months left im willing to show some of my own questions i bet its tougher than these😈 but this rotaional question was out of syllabus though

[@zhelyo_physics]

good luck preparing!

[@oneshotff2898]

@@zhelyo_physics thanks 🥰

[@System_exit]

3mins for that

[@BrainyFactFile]

Imagine an Asian uncles solves it in 1 second 🙏

[@atharvaparicharak9082]

Bro india is a part of Asia🙏

[@Chemphismat]

This question was of 2016 exam and i was attempting that question in exam hall. I just solve the whole question in about 7 min. But at the end of i got confused and i didn't mark the answer

[@zhelyo_physics]

very interesting, thank you for the comment.