Work and Energy 03 | Conservation of Energy | Power | Commercial Unit | Class 09 | NCERT | Sprint 

📝Download Lecture Notes From PhysicsWallah App : bit.ly/2SHIPW6 🎯 Science group- t.me/joinchat/RYszj_1cAl8xEvnv 🎯 Social Science- t.me/joinchat/GCBE5bDgFdxrZeI8 🎯 Mathematics group- t.me/joinchat/GBbG4p5S_OVRV920 ----------------------------------------------------------------------------- 🗓️ Scheduled Syllabus For Sprint ( Class 9th ) released describing which topics will be taught for how many days. Available at PhysicsWallah App :bit.ly/2SHIPW6 •Duration:-1 month (Jan 2021 - Feb 2021) 🎉 Free Batch Exclusive on our RU-vid Channel : Physics Wallah Foundation - 9 & 10 •Batch Details : 1) Best Faculties across India for different Subject/Topics. 2) Complete & Relevant Syllabus Coverage of Class 9th within 1 Month - Fastrack January 4,2021- February 15,2021 3) Monday - Saturday : Scheduled Classes everyday. •Physics : Tuesday, Saturday •Chemistry : Wednesday , Friday •Mathematics : Monday, Wednesday, Friday •Biology : Wednesday , Thursday , Saturday •S.ST : Tuesday, Thursday, Saturday, Sunday 4) Scheduled Syllabus released describing which topics will be taught for how many days. Available at PhysicsWallah App :bit.ly/2SHIPW6 ----------------------------------------------------------------------------- OUR SOCIAL MEDIA PROFILES : ⭐Instagram Handle : instagram.com/physicswallah/ ⭐Facebook Page: facebook.com/physicswallah ⭐Twitter Account : twitter.com/PhysicswallahAP?s=20 ⭐ PW App on Google Play Store : bit.ly/2SHIPW6 ❤️ Padhai Karte Rahe, All The Very Best 👍

Conservation of Love for Rakshak sir - Love for Rakshak sir neither be destroyed nor will be less. It Becomes multiplies after each leacture we watch ❤️😂

Rakshak sir is not only a great teacher of physics But also. He knows chemistry ,bio , geography , history , heritage. Etc In simple words He is chalta -phirta GOOGLE

SIR.......😍...... I am flat on your explanation............. need such types of teachers in school who can be friends of the students Im proud to get a class from PW ...... thanks a lot PW FAMILY ♥💓♥

Puniya sir have more power than other because a lot of knowledge he gave in a short time

Sir, please aap log naya batch laye aur usme dono classes (9&10) dono ki Olympiad , Foundation ki tayari karwaye

Power means shakti but in physics power is rate of doing work 😃😃

Best teaching techniques 💐💐💐sir👍👍you are really Foundation builder of physics concepts🥳👏

THE ans of challenger question 2 (khatra) is = 656470.588kg Mans the mass of water is = 656470.588kg it took my almost two hrs after getting formula of efficiency 🥲🥲🥲🥲🥲🥲🥲🥲🥲🥲

02:58 The end of world! Sir is so cool and says so scientific things,and is so relegious. I like this sir.

After a week I am going to give gtse exam . I hope this lecture will help me a lot . THANK YOU 😊 Sir

Sir you are so brilliant and my all concepts are cleared from your teaching.

🙏🙏🙏😭😭thank you so much sir your teaching style is very good and sir this changed this experience and interest in physics. Now my dream is to a successful engineer. thank you sir 🙏🙏😭😭😭❤️❤️

30:57 and 31:10 are best part of this video

Great Moment Puniya Sir What's The Smile Of Sir 😊❤️ Lobe You rakshak Sir Ek Hi Dil Hai Kitni Baar Jitenge aap

50:10 is the best scene😂

31:00 sir ham to 2 minute me khatam kar dete kam Ek baar me 5 -5 kursi leker😜😂😂😜🙏🙏

Sir, you are the best physics teacher for me❤️❤️✨. Your lectures make the concept crystal clear. Aap best ho sir... We love you and salute to your hard work and dedication for us❤️❤️🙏

Poonia sir=Bahubali (proved by rakshak sir)🤭🤭

31:00 sir's smile was epic❤❤ Sir ki smile ne dil chhoo liya

अकल में रक्षक सर ओर पुनिया सर ताकत में।।😂😂

pps = powerfulll puniya sirrr

Sir you are very brilliant you cleared my conservation of energy ⚡ concept ❤

sir ye commercial unit sirf India ke liye hai ya poore world mai ye use hota hai? loved the lecture !!!! maza aaya :) especially puniya sir wali baat

43:22 aur tumne 6 hazar ka bijali phoonk di...🤣🤣😂😂

I have a no words that he is explain you Mere pass hi nhi blki world me hi nhi hai Aap jaisa koi ❤❤❤❤❤❤❤❤

Sir please sound chapter bhee karwadoo I now sound chapter delete hogya he par heme sound chapter bhee phadna he. Please sir 🥺🥺🥺🥺🙂🥺

sir i have solved that concept building question in just 2 minutes because i love electronics . 🙂🙂

This is really helpful ....thank u sir May Allah bless every one living on this planet ( Aameen )

8:00 BIO SKILLS INSPECTED😂🔥

When my exam starts then in my mind always repeat a sentence (don't need to fear, when physics wallah is here)😊

Sir ur way if teaching is outstanding... 🥂.. Lot's of love from my side ❤🥰...

32:04 punia sir Powerful h😂

Puniya sir is powerful 👍💪💪

Most brilliant teacher of physics 😊😊

56:12 😂😂😂 best part of video 😂😂

sir In proof of conservation of mechanical energy (analytical method), why aren't you taking force of gravity in negative

Rakesh sir and poonia sir OP

does a body possess kinetic energy when it moves at a uniform velocity? (Because work done is zero)

Thank you so much sir

28:24 Sir here P.E. is inversely proportional to K.E.

I think we have to leave school because we are more learning with rakshak sir

Mere ko to sir se live phedna he. Sir explanation muchee bhoot achaaa legta sir love you

How can do you this to us sir ?? Itne acche se padhate ho kii maza hi aa jata h ,😂😂😂🤣🤣

Punya sir >>>>> any gigachad in existence Sir yeh dekhne se pehle physics samaj nahi aata tha ab pura chapter yaad hogaya hai ❣

My favorite dialogue "hello bachooooooo" 😂😂😂❤❤

❤️❤️❤️ only rakshak sir ❤️❤️❤️ talent alag dikhta he guru saiute ❤️❤️❤️se😘

Punya Sir Powerful 💪💪

Rakshak sir jindabad jindabad. ☺😎

Q2) Khatra...is based on 2 things 1) 1hp= 746W 2) Potential Energy formula i.e. mgh Horsepower developed is 500 and 1 hp = 746 hence 500×746= 373000W. Efficiency of generator is 85%/100= 373000 37300000/85= 438823.53 W. Water through the turbine per min is 438823.53×60= 2362941.18J. P.E= m×10×50=2362941.18 Hence ,...m=52658.82 kg of passes through the turbine per min.

13:57 Finally kuch toh 10th mein padhenge.😂😂😂

19:34 proof of law of conservation energy

Sir koi aapse achchi physics nhi padha skta you are op 🔥

Sir, conservation of energy mein toh total height apne 90m kaha hei lekin side mein ball ka position A, B, C, D toh 60 m show kar raha hain.. 😢😢

Awesome sir your way of teaching is just awesome, ☺😘😘

is question main ek naya formulae lagega that is 'efficiency=power output/power input' E = P out/ P in 0.85 = ( 5000 hp x 746 W ) / P in (:> as 1hp = 746 W ) P in = 5000 x 746 ) / 0.85 W now, Workdone = force x diplacement Wd = (mg)d wd= [m(10)] x 40 Wd = 400m power = Wd/t power = 400m/60 (5000 x 746 / 0.85) = 400m/60 m = 60/400 ( 5000 x 746 / 0.85 ) m= 658235.294 kg

Is it a technical issue or what ? 0:44 Challenger question 1. Sir 250 ki unit missing hai .. assuming unit to be kwh , then answer is 250 × 1000 × 3600 = 9 ×10⁸ 2.10970.58kg* poonia ji ke student hai 💪💪

Sir parhate nehi he, sir to feel kara dete he...my jeetu bhaiya .. love you sir.. and wishing you happy durga pooja.

32:09- Punia sir ke dunia me sb tagatwar log hi rehte hai

Thanks for make video of this chapter in detail.

Ese hi teacher ho to kahna hi kya he❤️❤️🙏🙄🙄

32:00 puniya sir be like :- hmse jyda koi shaktishali nahi h yaha😂

29:47 Guys we are more powerful, We finished the whole lecture without any doubt 😂

I have a confusion in concept building questions a set of four bulbs of power rating 40 watt each are being Run for 10 hours i) find total power expended In this question why didn't we multiply 10 hours with the 160 watt? Please can someone explain it???

Urr amazinn sir. Thnkuu so much.. U daa bestt teacher ever...♡

I get emotional in the teaching style of rakshak sir everytime.....thats why i have to repeat everything again nd again

First 43 second. I can't stop laughing best teacher ever ❣️Puniya sir

You are very great teacher. Your concept are clear. Sir I'm study in hindi medium school🎒📚. I'm Vivek tiwari.

Challenger Ques No. 2 The average power developed is = 500 hp, i.e 373×10^3 W Let P be the actual power of which 85% is utilized by the turbine. So, 85P/373×10^3 = 4388235 W So, the energy utilized by the turbines per second is 438823.53 J The energy utilized per minute is = 438823.53×60=2362941.18 J Let 'm' be the mass of water that falls through height 50M per minute to generate energy 2632941.18 J Therefore, mgh = 2632941.18 m×10×50=2362941.18 m= 52658.82 kg HOPE IT HELPED YOU ! 💝

Challenger questions 1. 9×10^8 J 2. 658235.29 kg

Physics+knowledge=puniya sir💯💯👍👍

Sir I wish that your ofline coaching should be in gwalior

Best explaination for exam 👍👍👍👍

Physics hard lgti thi but now easy 👌 Mai ummed nhi kr skta ki it is easy hoti hai physics

I think our school teachers are disliking

(Motu = samosha bheem= ladoo Puniya = buniya)=power 🤣🤣

Sir school wala sir apka aaaga phika pad jata ha or us time apki yaad aati ha ❤️❤️❤️ love you sir

Puniya sir to h hi vaise mustunde🤣🤣🤣🤣🤣. 31:10

Loved your explanation sir....PW OP !!!!!

punia sir ki shakti dhoom machaye samne koi tik na paye

Sir, poonia sir bahut takatver hai vo to room palat dete hai to chair kya hai😂😂😂😂😂😂

Rakhsar sir is the best sir for physics ..love from Odisha

Poonia sir shaktishali 😜 Op mohit sir 🔥🔥

Sir i have a question- you said that "jitne energy phele thi vo utni hi rhegi" energy can't be created but sir jo energy phele thi vo kha se aayi tab toh energy create hui hogi ?? sir please answer.

14:45 Sir Potential Energy Converts Into Kinetic Energy

Sir u r wonderful 🎉🎉💯💯💯 No one can defeat or. Even challenge u

12:55 Sir fan also must have potential energy because of its height from ground

Happy guru Purnima sr 🥰🥰🥰🥰🥰🥰🥰🥰🥰🥰🥰

1)- 9*10^8 joule. 2)- m= 658235.29 kg. Hope it helps.

Sir aap tution kab start kar raha ho😂

14:24 sir P.E. to K.E. to R.K.E to electrical energy

Perfect explanation for rakesh sir

Your teaching method help me very much in study

2as=v square - u square Mai s= 60 m la sakta hai

rakshak sir garv gambhir do you remember takshila class 9th 10th physics

VERY AMAZING VIDEO!! CLEARED ALL MY DOUBTS

Yes I am familiar with the dam I live at ujjani where ujni dam is built it is the biggest dam in maharashtra I have seen turbines working .

11:42 kal ko wo bulbs phat jaye gi toh sound energy bhi mil sakti hai apko sunnne ko umeed karta hu nhi mile 🤣🤣🤣

Thank you so much sir for session ☺️

Your lectrure is very helpful🙏🙏🙏🙏😊😊...thank you sir