11 chap 7 | Centre of Mass 03 | COM of Continuous Bodies | COM of Hollow and Solid Hemisphere , Cone

Live Classes, Video Lectures, Test Series, Lecturewise notes, topicwise DPP, dynamic Exercise and much more on Physicswallah App.

LAKSHYA Batch(2020-21)

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1) Complete Class 12th + JEE Mains/ NEET syllabus - Targeting 95% in Board Exams and Selection in JEE MAINS / NEET with a Strong Score under Direct Guidance of Alakh Pandey.

2)Live Classes and recorded Video Lectures (New, different from those on YouTube)

3)PDF Notes of each class.

4)DPP: Daily Practice Problems with each class having 10 questions based on the class of JEE Mains/NEET level.

5)Syllabus Completion by end of January, 2021 with topicwise discussion of Last 10 Years Problems in Boards, JEE Mains/NEET within Lecture.

6)The Complete Course (Video Lectures, PDF Notes, any other Study Material) will be accessible to all the students untill JEE Mains & NEET 2021 (nearly May 2021)

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****Test Series for XI & XII****

We provide you the best test series for Class XI,XII, JEE, NEET chapterwise, which will be scheduled for whole year.
The test series follows very logical sequence of Basic to Advance questions.&
Evaluation of Test and Solution to all the questions at the end of the test.

11 chap 7 || System of Particles - Centre of Mass 01 || Introduction Of COM for IIT JEE / NEET ||

11 chap 7 | Centre of Mass 02 | COM of Continuous Bodies | COM of Semicircular Ring ,Disc,Triangle |

Class 11 chapter 7 System Of Particles | Centre of Mass 04 | Motion of Centre Of Mass IIT JEE / NEET

Class 11 Chapter 7 System Of Particles | Centre Of Mass 05 | Conservation Of Linear Momentum IIT JEE

Class 11 Chapter 7 | Centre Of Mass 06 | Conservation of Momentum in Bomb (Shell ) Explosion IIT JEE

Centre Of Mass 07 || Collision Series 01 || Elastic Collisions in 1 -D || IIT JEE MAINS / NEET |

Centre Of Mass 08 || Collision Series 02 || Elastic Collision in Two Dimension IIT JEE / NEET ||

Centre Of Mass 09 || Collision Series 03 || Inelastic Collisions IIT JEE / NEET ||

COM 10 | Collision Series 04 | Coefficient Of Restitution | Elastic and Inelastic Collisions IIT JEE

Centre Of Mass 11 || Collision Series 05 | Oblique Collision | Elastic Inelastic Collision JEE /NEET

Centre Of Mass 11 || Trick For COM of Remaining Part || When Mass is Removed IIT JEE MAIN / NEET ||

[PhysicsWallah]

Live Classes, Video Lectures, Test Series, Lecturewise notes, topicwise DPP, dynamic Exercise and much more on Physicswallah App.



LAKSHYA Batch(2020-21)

Registration Open!!!!

What will you get in the Lakshya Batch?

1) Complete Class 12th + JEE Mains/ NEET syllabus - Targeting 95% in Board Exams and Selection in JEE MAINS / NEET with a Strong Score under Direct Guidance of Alakh Pandey.

2)Live Classes and recorded Video Lectures (New, different from those on YouTube)

3)PDF Notes of each class.

4)DPP: Daily Practice Problems with each class having 10 questions based on the class of JEE Mains/NEET level.

5)Syllabus Completion by end of January, 2021 with topicwise discussion of Last 10 Years Problems in Boards, JEE Mains/NEET within Lecture.

6)The Complete Course (Video Lectures, PDF Notes, any other Study Material) will be accessible to all the students untill JEE Mains & NEET 2021 (nearly May 2021)

7)In case you missed a live class, you can see its recording.

8)You can view the videos any number of times.

9)Each chapter will be discussed in detail with all concepts and numericals

10)Chapterwise Approach towards JEE Mains/ NEET & Board Exams.


****Test Series for XI & XII****

We provide you the best test series for Class XI, XII, JEE, NEET chapterwise, which will be scheduled for whole year.
The test series follows very logical sequence of Basic to Advance questions.&
Evaluation of Test and Solution to all the questions at the end of the test.

11 chap 7 || System of Particles - Centre of Mass 01 || Introduction Of COM for IIT JEE / NEET ||

11 chap 7 | Centre of Mass 02 | COM of Continuous Bodies | COM of Semicircular Ring, Disc,Triangle |

11 chap 7 | Centre of Mass 03 | COM of Continuous Bodies | COM of Hollow and Solid Hemisphere, Cone

Class 11 chapter 7 System Of Particles | Centre of Mass 04 | Motion of Centre Of Mass IIT JEE / NEET

Class 11 Chapter 7 System Of Particles | Centre Of Mass 05 | Conservation Of Linear Momentum IIT JEE

Class 11 Chapter 7 | Centre Of Mass 06 | Conservation of Momentum in Bomb (Shell ) Explosion IIT JEE

Centre Of Mass 07 || Collision Series 01 || Elastic Collisions in 1 -D || IIT JEE MAINS / NEET |

Centre Of Mass 08 || Collision Series 02 || Elastic Collision in Two Dimension IIT JEE / NEET ||

Centre Of Mass 09 || Collision Series 03 || Inelastic Collisions IIT JEE / NEET ||

COM 10 | Collision Series 04 | Coefficient Of Restitution | Elastic and Inelastic Collisions IIT JEE

Centre Of Mass 11 || Collision Series 05 | Oblique Collision | Elastic Inelastic Collision JEE /NEET

Centre Of Mass 11 || Trick For COM of Remaining Part || When Mass is Removed IIT JEE MAIN / NEET ||

Class 11 chapter 7 | Systems Of Particles and Rotational Motion | Rotational Motion 01: Introduction
Class 11 chapter 7 | Rotatational Motion 02 || Torque - Moment Of Force - Turning Effect Of Force |

Class 11 chapter 7 | Rotational Motion 03 | Rotational Equilibrium IIT JEE / NEET | Torque Problem |

Class 11 chapter 7 || Rotational Motion 04 || Moment Of Inertia - Introduction ||

Rotational Motion 05 | Moment Of Inertia Of Continous Bodies - Rod, Ring, Disc, Cylinder, Triangle

Rotational Motion 06 || Moment Of Inertia Of Sphere and Cone || MOI of solid Sphere JEE MAINS /NEET

Rotational Motion 07 || Perpendicular and Parallel Axis Theorem Moment Of Inertia JEE MAINS / NEET

Rotational Motion 08 | Best Numericals of Rotational Motion and Rigid Body Dynamics JEE MAINS /NEET

Rotational Motion 09 | Hinge Forces | Rigid Body Dynamics JEE MAINS / NEET | Rotational Numericals

Rotational Motion 10 || Kinetic Energy of a Rotating Body | Work Done By Torque IIT JEE MAINS / NEET

Rotational Motion 11 || Angular Momentum IIT JEE MAINS / NEET || Angular Momentum of Rotating Body


Rotational Motion 12 || Conservation Of Angular Momentum || Angular Momentum IIT JEE MAINS / NEET

Rotational Motion 13 | Rolling Series 01 | Combined Translation + Rotational Motion |IIT JEE / NEET

Rotational Motion 14 | Rolling Series 2 |MOI, KE and L expression for Translation + Rotation Motion

Rotational Motion 15 | Rolling Series 3 | PURE ROLLING JEE MAINS / NEET | Uniform PURE ROLLING

Rotational Motion 16 | Rolling Series 4 | Forces in PURE Rolling | Pure Rolling IIT JEE MAINS / NEET

Rotational Motion 17 | Pure Rolling on Inclined Plane IIT JEE MAINS / NEET | Rolling Series 5

[adityacnady_for_life]

Sirji I'm a student of Aakash Institute Allahabad and I do not hesitate to say that you provide a better content and cover every topic these institutes teach..Best teacher in the world!

[AniCodeStar]

CENTER of MASS of IMPORTANT

object to be learned:
semi¬circular wire/ring= 2R/π
semi¬circular disc= 4R/3π
triangular plate= H/3
hemisphere hollow= R/2
solid hemisphere= 3R/8
solid cone= H/4
hollow cone= H/3

[sumitnagar]

I have no words to express my gratitude towards alakh sir ..Wow such a great teacher ..Just because of him I like physic and chemistry ..

[mohammedshafi]

Physics wallah: Chalo start karte hai
Unacademy:subscribe nhi Kiya toh gunah kar rahe no
Physics wallah always best, God of physics 🥰🥰😍😍😌😌

[shivampathak]

The COM of a hollow cone is H/3
(from the base)☺☺
Explanation :-
Take a hollow cone with radius 'R', height 'H' and mass 'M'
Take an elementary ring of mass 'dm', width 'dy' and and radius 'r' at a height of 'y' above the origin (assume base as origin)
then by similarity
r/R = H-y/H
r = (H-y)R/H
Also hollow cone is a 2-D shape
Sigma = M/area
=M/pi RL
Now, dm = sigma dA
dm = Sigma 2pi r dy
Then integrate ydm/dm by taking limits 0 to H and put value of dm on both numerator and denominator coz sigma 2pi
will be cut from both num. and deno. In the end u'll got integration of (H - y)dy in the denominator that is
H (y) - y^2/2
The final ans will be H/3
Hope it will help some1 and if some1 get confused plz cnfrm
Thank you sir 😊😊

[viperxghost]

Major Institutes: Our student grabbed AIR 1 in NEET, JEE & IIT
Alakh SIr: Are Sb mere hi bache hai.

[tusharsinghal]

Sir I didn’t understand this from my school teacher but after learning from u i got to know that it was very easy
U show the importance of a guru in my life which can help many other people like me

[VivekYadav-dsoz]

Sir you're such a wonderful teacher. You made my concepts strong enough that I did the Solid Cone COM from scratch by myself from guessing the shape of dM required (ok that was a trivial thing but it still counts) till end..

[puskarbasak]

COM of solid hemisphere of density rho = 2r^2, with mass 'M' and radius 'R' is 5R/12.

[gyaneshwarkumar]

CONCEPT AAJATA H SAMAJH .JHAPKTE HI PALAK KYUKI MERE GURUJI KA NAM H ALAKH😍😍

[venkatsiddarth]

Sir the answer for the centre of mass for hollow cone is H/3
It happens because when we cut the elementary part we get a ring like structure and when we cut the ring at any point we get a strip similarily if we cut all the rings in the hollow cone and make the like strips we get a triangular laminar and therefore we know the centre of triangular lamina as H/3.

[rimajain]

I did the hollow cone com 4-5 times. In the formula instead of writing 'M' in the denominator, try solving with 'dm'. In doing so, the term of slant height 'L' will be eliminated. We'll get the ans H/3 as the com from base

[yatinutreja]

Never asked anyone to subscribe to his channel still stands above all channels love u physics wallah

[rohitkodag]

COM of hollow cone =
2H/3 from top of the cone
Hence, H/3 from the base

[thomassharma]

600k in 2nd lecture and 300 k in third.. Adhe bcho ki ft gyi 😂

[bobbymathur]

Sir I think u are the only teacher who teach with such an amazing pattern and clear each concept of every chapter....amazing sir...but sir I want to say u that I didn't complete tests(jee) in time due to which I score low ..so sir plZ help and make a vdo on how we do paper on time and by what pattern ...plZ sir do response on this msgg...

[anupamaanu]

Sir..I don't have more to say you are the perfect person to give the divine title 'The Teacher'...So glad to have a teacher like u ❣️❣️

[debashisganguly]

Sir, I had to use : Sigma = (M) / (Pie*R*L) .. (L being the lateral length of the hollow cone) to start the calculation along with replacing "y" and "dm" in terms of "l" & "dl" through considering da = 2*pie*r*dl as the area of the ring (radius "r") at a vertical height of "y" (& also equivalent slant height of "l" from the ground circular base of the cone having total vertical height of "H" & total slant height of "L" with base radius of "R") ... Final answer thus arrived is : CoM = H/3

[IndieDeveloperGuy]

sir i am happy that i am able to solve all of them in three different ways creating an integrable function on my own....when i was in 11th i was facing problem in these things as back then i didnt even knew integration clearly :P