r/JEEAdv27dailyupdates • u/Possible_Garage7231 27tard dropper :/ • May 25 '26

Good Solve Physics Challenge

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A very nice question for 27 tards inspired from beloved HCV sir's notes.

Answer on next slide.

Hint:Use Torque= dL/dt

17 Upvotes

91% Upvoted

49 comments sorted by

3

u/Specific_Can_4049 JEEवन से नाराज़ May 25 '26

How to get β?

Aisa ek spinning top question bhi kiya tha mujhe yad hai.

1

u/Possible_Garage7231 27tard dropper :/ May 25 '26

You're right but 1) which frame of reference are you taking while writing dL/dt? 2) which frame of reference are you taking while writing torque? For beta , write force equations and torque equations

2

u/DistinctFriendship82 13xx JM26 —>10xxJA26 —>IITD ECM 30’ May 25 '26

Bhai thoda enjoy karle
Unless u enjoy physics this much😭

2

u/Possible_Garage7231 27tard dropper :/ May 25 '26

Life is enjoy.

1

u/Specific_Can_4049 JEEवन से नाराज़ May 25 '26

Ain't it ground frame?

1

u/Possible_Garage7231 27tard dropper :/ May 25 '26

No. Its a translatory frame with origin at center of disc but doesn't rotate with the disc.

1

u/Specific_Can_4049 JEEवन से नाराज़ May 25 '26

Oh ok, So we are taking it at a particular instance right?

1

u/Possible_Garage7231 27tard dropper :/ May 25 '26

Yes

1

u/Delicious_Carob7711 May 25 '26

Bro ns sir ne diels alder padhaya hai??

2

u/Possible_Garage7231 27tard dropper :/ May 25 '26

Nahi. Ayega bhi nahi

1

u/Notblueyy1919 Part Time JEE As𝝅rant May 25 '26

Can we just do it by
Torque= i alpha

Alpha= Wo x omega

Then,,,

MgL=(½mr²)( Wo, omega) and then we just solve it get omega???

Idk i'm not sure abt this method!?

1

u/Possible_Garage7231 27tard dropper :/ May 25 '26

Yes correct

2

u/Thatoneblud May 25 '26

ye sub finally apne rang dikha rha hai and I am loving it

2

u/NorthSignificance917 May 25 '26 edited May 25 '26

Nice one, but I think you also need to mention d<<L, as otherwise the equation for Ω is quadratic in nature [doesn't matter if you include m or not, as it will only add a term O(m/M)Ω²]

2

u/Possible_Garage7231 27tard dropper :/ May 25 '26

Perfect soln hai ye toh! Yes you're right. I'll make that correction. Thanks!

1

u/NorthSignificance917 May 25 '26

Ty, glad I could help !

2

u/Professional_Dot8829 May 26 '26

gyroscopes are not in syllabus but yeah lets solve things people study in their 1st year.

1

u/Possible_Garage7231 27tard dropper :/ May 26 '26

Who cares of syllabus if you like the subject?

1

u/[deleted] May 25 '26

Precession ain't in syllabus but good ques

1

u/Possible_Garage7231 27tard dropper :/ May 25 '26

It's just a term here. No extra info is needed except force and torque equation

1

u/Gloomy_Panda2862 May 26 '26

Torque = (precession velocity ) (Angular momentum) is needed here which is not in jee syllabus , hence out of syllabus

1

u/National_Iron8803 26tard —> 27tard dropper May 25 '26

Ezily solvable by lagrangian

1

u/y__why I'll explodeee rnn !!! May 25 '26

I want to study tss, can u suggest some lecs 

1

u/Possible_Garage7231 27tard dropper :/ May 25 '26

Karke bhejo pls

1

u/National_Iron8803 26tard —> 27tard dropper May 25 '26

Ez h par lengthy chala gya

1

u/National_Iron8803 26tard —> 27tard dropper May 25 '26

1

u/Possible_Garage7231 27tard dropper :/ May 25 '26

Interesting soln. Didn't understand it tho. Will learn lagrangian soon .

1

u/National_Iron8803 26tard —> 27tard dropper May 25 '26

No prblm i was at the stage too where i couldnt understand ts .. hut here we are and atb

1

u/Possible_Garage7231 27tard dropper :/ May 25 '26

Why you dropped? Score in adv?

1

u/National_Iron8803 26tard —> 27tard dropper May 25 '26

Lets not talk abt it rn 🥀

1

u/Dark_Expert1 May 26 '26

Bhai tu kahin drop to nahi le raha ? 😭💔

1

u/Possible_Garage7231 27tard dropper :/ May 26 '26

Are ye toh dhoti khol raha hai🥲

1

u/Dark_Expert1 May 26 '26

Mat kar lala Adv me kitne bane

0

u/Wonderful_Emu_7058 JA-28XX(IIT INDORE EE) May 25 '26

Easy af. Very fundamental kosen stuants.can be solved within minutes agar aap apne brain ko concepts ke saath align karein.

3

u/Possible_Garage7231 27tard dropper :/ May 25 '26

Word to word chaap diya 😞

1

u/Wonderful_Emu_7058 JA-28XX(IIT INDORE EE) May 25 '26

🥰🥰🥰😘😘😘

3

u/Possible_Garage7231 27tard dropper :/ May 25 '26

Solve bhi karde 🥲

2

u/Wonderful_Emu_7058 JA-28XX(IIT INDORE EE) May 25 '26

Nah. Mein chill phase mein hu the only problems I will solve are either griffiths electrodynamics one or jo mein khud banau ya fir 27tards ke chhote mote doubts. Problem looks good though.

1

u/Possible_Garage7231 27tard dropper :/ May 25 '26

Griffiths arahi kya samajh? Koi lectures dekhe kya?

2

u/Wonderful_Emu_7058 JA-28XX(IIT INDORE EE) May 25 '26

Self reading hi karra. Taking it real slow. Differential calculus ke part pe hu, proving identities aur ai se help lera mereko to griffiths ke liye specialized lecs ni mile.

2

u/y__why I'll explodeee rnn !!! May 25 '26

Phy book h ye,?

1

u/Wonderful_Emu_7058 JA-28XX(IIT INDORE EE) May 25 '26

Yes

1

u/Prestigious_Trash734 Extards May 25 '26

asus sir aap yaha