Problem from Asia's Toughest Physics Exam

[@zhelyo_physics]

How is everyone's summer going? Here are all my Olympiad Solutions: kzbin.info/www/bejne/Z52lYaWBhNl1f5o

[@PhysicsdudeYe]

Respect for this man He puts so much effort .physics is the best

[@zhelyo_physics]

thanks a lot! Very much appreciate the comment! While I do, it's also great fun for me! : ) Glad you enjoy!

[@ykmt96]

If we straight away multiply by e to the power kt/m at step ( 2.46 time stamp), the equation becomes more simpler. Thanks for the great problem.

[@Arnav1883]

15:02 Is that an application of Stokes' theorem? I just started with electricity so I am not sure.

[@indianbeast644]

if an ellipse with major axis is equal to diameter of sphere an its minor axis is fraction of root 2 times of radius of sphere. if ellipse is rotated 180 degrees it acquires a certain volume if the volume is removed symmetrically with respect to diameter of sphere. find the equation of electric field and potential at the center of the sphere and electric flux along x axis if density through out the sphere is constant. Sir please dont forget my question of your previous video😅.

[@zhelyo_physics]

Definitely not! I am still on holiday sadly without a whiteboard for a couple of more weeks, I filmed those before : ) Maybe I'll try to bring my whiteboard as carry on luggage next time :D

[@indianbeast644]

@@zhelyo_physics sorry for inconvenience sir . I was just excited to know answer.

[@sangeetarani5111]

Can you please tell me that can electromagnets be used for propulsion of the space rockets ???????? This idea came to my mind yesterday and I'm still thinking how we can make it possible

[@zhelyo_physics]

Hmm they can definitely be used as propellents, I think this is one of the designs behind the idea of a space elevator. Well worth researching, have a look!

[@mikemiketic9654]

Could you in a future maybe do some Romanian Master of Physics, I heard it was IPhO difficulty, or maybe some Balkan Physics Olympiad problems. Of course I know these aren't easy to make, so I uderstand if you don't want to do them.

[@zhelyo_physics]

thanks! Very interesting, I will have a look. Here is a question from the Bulgarian Olympiad until then : ) kzbin.info/www/bejne/h3m3eo2parekgZY

[@mikemiketic9654]

Thanks!

[@drneutro369]

Hi sir I’m currently struggling alot with exam questions, I can’t seem to answer any, I watched the videos on the content, so I do sort of know the content. Do you know what I can do to improve? I would like to improve my physics predicted grade.

[@zhelyo_physics]

sorry to hear you are struggling with questions. It's hard to summarise in a comment, however I have summarised most of my exam advice in a playlist of short videos here: kzbin.info/aero/PLSygKZqfTjPBKc4kvwdj3YabFiYyvKDcN I hope these are helpful, good luck!

[@ibragimshamsiyev_]

Great. Do you have Gre physics courses

[@zhelyo_physics]

Thanks a lot! Glad you enjoyed it, I don't but it's a great idea I will look into.

[@Physics1490]

Sir, I Have Resnick Halliday Krane Physics books vol 1 and 2. How Many Days/month I need To Complete these Volumes? and I want Compete Apho Please Give Some Tips For Problem Solving

[@zhelyo_physics]

Hard to give a definite time frame. After years you will always feel there is still some room to master concepts. kzbin.info/www/bejne/gWjEgKGJfN6Ugqs This video might be helpful!

[@Physics1490]

@@zhelyo_physics Thank You Sir ❤️💕

[@needingmorebullets]

take a look at ITA, brazilian hardest entrance exam in my opinion, the 2014 exams have very hard questions

[@zhelyo_physics]

once I was sent those once , they look super hard, I will see what I can do

[@luistfm]

Ye, it's hard, but i think it's closer to ENEM than to internacional physics olympics lol

[@beaconoflight8298]

Good one

[@zhelyo_physics]

thanks a lot! Much appreciated.

[@Physicslover0193]

Hey dude , Ive solved thisnque taking me 1hr 20 min to solve ... is it fine ?

[@starfoxtitan7859]

Wouldn't you have to multiply Cz by g also?

[@hasan2524]

Hi is there a physics a2 / a level content videos as it would be really helpful for next year, thanks

[@zhelyo_physics]

Hi, I have filmed the entire A2 content, it's the second half of this playlist: kzbin.info/aero/PLSygKZqfTjPC3hJ7nRSnnXTw3tI_o67dR Additionally throughout my videos if you have a browse you will find tons of dedicated A2 videos. Hope this helps!

[@hasan2524]

Much appreciated!

[@زینبفلاح-ج7ش]

Yow didn't need that lot of work for part b you could just integrate at the first time

[@zhelyo_physics]

Oh what do you mean exactly? I am curious, I'm always on the lookout, to find ways of getting to the answer that are easier.

[@manthangondane6342]

SINCE THE COEFF FOR Z(DOT) IS K/M THE INTEGRATING FACTOR WOULD e^integral(-k/m)dt SO AFTER SOLVING IT WILL BE e^-kt/m Now, Z(DOT) TIME THE I.F. = g(e^-kt/m) and integrate once again to get z(dot) times i.e = THE PRODUCT ON THE RIGHT +C AND AS PER INFO WILL FIND C

[@epicgamer4551]

Hello sir, would you know where Id be able to find the IPHO questions for this year?

[@zhelyo_physics]

yep, they are here: ipho2023.jp/en/theoretical-exam/

[@shreyanshpatel0707]

sir, take problems from JEE-Adv (India) exam .....

[@zhelyo_physics]

I have a playlist here for this: kzbin.info/aero/PLSygKZqfTjPAs0IBTO4cXbTdwtQ1fpiX8 More soon! : )

[@eringulec9505]

5:42 😂

[@lomenn2846]

Could I ask why fk/m = df/dt? Thanks.

[@zhelyo_physics]

Excellent question! We apply the product rule trick. We choose a function such that this rule is true. Then we try to find it : ) This allows to solve the equation. I have used an identical technique in basically the same equation but for air resistance here if you are interested: kzbin.info/www/bejne/b3zZnoyfeNWNeLc

[@lomenn2846]

Thank you very much.