Class 11 Physics | Thermal Expansion | #3 Types of Thermal Expansions | For JEE & NEET

[@bios546]

If we consider system: rod (2:19), then is there some force that exerts on the rod? As the com displaces rightwards from rest... so, did some force from "outside" the system have to act on the rod?

[@roopasharma32]

no

[@anshsaxena8312]

I know I'm 7 years late, but if someone has this same doubt, the answer is yes and no depending on the situation If the rod is not fixed and is expanding in free space, there is no external force acting on it and the COM will not change position in the inertial frame, it will expand equally in all directions according to mass distribution. But in the example sir took, the rod is fixed on the left end, so particles near that end will try to expand in its direction but will be stopped by whatever structure the rod is attached to, this structure will provide the external force causing the COM to displace to the right (you can view it as normal force)

[@arjitarora9399]

Sir in superfical and cubical expansion how we use intial relation i.e we use in linear expansion . Because if number of particles increses then expansion also increases in all dimensions.

[@tpsicmin]

Thank You Sir Ashish Sir Is Best PG Team Is Best 😎😎😎😎😎😎

[@bios546]

Does y(coeff of cubical expansion) exist for gas?

[@physicsgalaxyworld]

yes it exist... but in different cases you need to find it for every specific container in which gas is trapped by a piston...

[@bios546]

Ok, so the piston is for measuring the change in volume right sir?

[@physicsgalaxyworld]

Yes as well as length of cylinder occupied by gas as if we need to find its linear expansion coefficient in some case...

[@NeetstrategiesinTamil]

It is very useful for me sir .thank you sir

[@shaikabdulazeez8337]

👩‍💼🙂such a great teacher..

[@shaikabdulazeez8337]

♡♡: )

[@ramyarajendran957]

Thanks a lot sir!helped me in my self study:-))

[@ramyarajendran957]

B-)

[@vasunith9682]

|:-()

[@dineshkumarsharma3174]

Hi bro ab kaha ho

[@dineshkumarsharma3174]

Where are you now

[@shivansh5924]

What is gamma in cubical expansion

[@kirito-r7h]

its coeff of expan

[@stacyjerop683]

Show the change in area of rectangular block

[@alphaiitd1]

Greatness personified

[@dhruvbhardwaj1580]

u r great

[@KeyurKumbhare]

Sir, what is the material that we use to fix one end of the rod?

[@physicsgalaxyworld]

You can just clamp it rigidly ... by any means...

[@abhijeet1744]

are you in IIT now bhaiya?

[@dineshkumarsharma3174]

Where are u now bro

[@KeyurKumbhare]

@@dineshkumarsharma3174 Google my name and you’ll know, mate!

[@aswinaspirant4100]

hello sir , kindly reply that how to take notes while watching your lectures or after watching your lectures ? plz suggest some way sir?//!

[@ro_33ameicus16]

Dude,pause the video when necessary, take notes and once restudy them and again play the video ! Hope it helps !

[@surajkumarbehera]

sir after i complete a chapter i give a test at quirgid section of the website and my speed also increased with each test ....thank you sir but these tests are for jee .....but i am preparing for neet and aiims .....will it be a lose to me as these tests contain many tough question....? are such type of questions useful for aiims ?? or should i stop practicing them ?

[@abhiramk.t.8069]

sir can we use this equation to find a decrese in length for a given decrease in temperature? Does the coffecient decrease with increase in temperature??

[@physicsgalaxyworld]

No it remain same for a given range of temperature... however actually it changes for large range... but that is not considered at this level...

[@aanchalroy9585]

bhaiya where are you studying right now?, did you reach IIT or NIT

[@anmolempire1197]

What is one of rod isn't fixed ?

[@kingpatil2882]

what do you mean? If one end of rod is not fixed then expansion will occur at that end too though it will be negligible. A-------B say you fix A and start heating then expansion will occur at B if A is not fixed then its quite obvious that end A will expand too, TO keep calulations easier and make observation for such small changes feasiable, we fix one end and take into account the other.

[@ritikasathuua]

Sir, Are this still relevant enough for me to crack jee mains?????

[@OrchestratedChicanery]

¯\_(ツ)_/¯

[@kirito-r7h]

should i need to watch checklist after this sir

[@physicsgalaxyworld]

Yes you should

[@kirito-r7h]

@@physicsgalaxyworld ty sir

[@gandharvesolanki3574]

Sir in linear expansion you have consider that temp increases from t1-t2 but in superficial expansion why have you considered a small change in temp?t=t+delta sir plz do reply?

[@physicsgalaxyworld]

Both are similar...

[@kingpatil2882]

its one and the same hing, say initial temp in cubical expansion was T and increase in temprature is DELTA T(ie T(final)- T) you can write T(final)= T + DELTA T T(final)= T + T(final)-T You get 0=0 hope you understand its the same thing.

[@Darklord-nv1rw]

Sir you gamma say very very small in 13.13min but upto what value ??

[@repudirajasekhar3884]

Sir...if we increase temperature then alpha also increases... then how can we say alpha is constant...plz tell me sir

[@physicsgalaxyworld]

variation of alpha is very small in a short range of temperature which we consider only in case some function is given... such cases we've already taken in illustrations... so unless specified in a situation, we consider α, a constant...

[@repudirajasekhar3884]

Physics Galaxy yes sir thank u sir

[@bhojraj3635]

sir ,, u are stated Pf=Pi(1-gamma AT) this formula cannot apply for liquids........what i should do for this question,, The density of water at 0°C is 0"998 g/cm 3 and at 4°C is 1000 g/cm Calculate the average coefficient of volume expansion of water in the temperature range 0 to 4°C... to get answer?

[@physicsgalaxyworld]

You can use this relation for liquids... for water from 0°C to 4°C coefficient for water is negative...

[@bhojraj3635]

tanq sir

[@surajkumarbehera]

@@physicsgalaxyworld sir why it is negative? is it explained in later videos of this chapter?

[@saurabhsharma758]

@@surajkumarbehera at 0° c water is solid and ice have lesser density then water. Also at 4°c water have maximum density ( anomalous behavior of water )

[@wrestlingasylum7779]

Thanks sir

[@shivamverma9447]

💙💚:-)

[@anmolempire1197]

Hey ....

[@shivamverma9447]

@@anmolempire1197 hello bro.

[@ForReal..18]

.

[@yanurag784]

Thanks sir