Solutions to Problem 199

Simple Newtonian Mechanics

[@AdityaKumar-gd5oy]

When I saw thumbnail I was shocked who was she ???😂😂😂

[@kuldeepkhajuria7938]

Same here

[@gamerkhanadnan]

😂😂😂

[@Sumitkumarji01]

She is her wife

[@carultch]

I think she is Martha Stewart. Walter was a guest on her TV show.

[@jdubruyn]

Apologies for not answering Prof🙏Breaks my heart that time is just too little for me to learn from scratch right now.. Will keep watching at first before I try again. Thank you Keith for the solution(s) #Legend

[@Victor_hehe]

I am in 10th standard and Sir 😊 You are my inspiration ❤️ You actually made my love physics

[@maas0146]

I am lot respect for you sir 🙏

[@AyanHaider_5mdcat]

Thank u sir g I need it❤

[@rishijadhav180]

which books shall i refer to start my study in physics?

[@user-ps4je2oh6q]

Love from INDIA❤❤

[@jaygray1001]

I ❤ you and all your teachings. Gravity has no other energy to balance it correct? The correct angles, toroidal, magnetics, and quantum physics will be the answer to gravity. Vera Ruben proved Newtonian Mechanics doesn't work. If I could spend a few hours with you, I could only imagine how much new discoveries would be found. Quantum tunneling, space time and time space. These concepts will play a huge piece in the future. Thank You.

[@gaurav9290]

Hello Walter Lewin, my physics teacher teaches us physics in a really bad way that we all get bored. At first I thought it was my problem but soon after some time I realised I am interested in physics when I study by my own. Nevertheless, our teacher expects our solution should match to his methods, he doesn't do any experiments, he doesn't proof any theorem and he just forces us to cram all the formulas for exam. I love to study physics but without knowing the logic of something I cannot understand it. At last, I may ask you that what should I do, Should I study by myself and your lectures 8.02, 8.03(already watched 8.01 and loved it) or should I just cram what my teacher says.

[@kevinyang4539]

Sir have a good day!

[@devi100688]

Nice Discussion..Sir, Misprint of Acceleration Unit.

[@lecturesbywalterlewin.they9259]

yes they weres slip of the pen

[@basically-ky2rp]

Sir I have a question - A nonconducting sheet of large surface area and thickness d contains uniform charge distribution of density p. Find the electric field at a point P inside the plate, at a distance x from the central plane.[ from prof. Verma's book] Two answers are coming when I choose Gaussian surface as vertical cyclinder I get px/2E° And when I choose Gaussian surface as horizontal cylinder I get px/E° Please help me to solve this problem [sorry for grammatical errors]

[@lecturesbywalterlewin.they9259]

watch my 8.02 lectures - your answers are there

[@exactempire7854]

Sir, what book do you use in your 8.01 lectures and what book do you recommend for classical mechanics

[@lecturesbywalterlewin.they9259]

8.01 Physics Hans C. Ohanian Physics Volume 1 2nd edition W.W. Norton & Company ISBN 0-393-95748-9 8.02 Physics for Scientists & Engineers by Douglas C. Giancoli. Prentice Hall Third Edition ISBN 0-13-021517-18 8.03 Vibrations and Waves by Anthony French CRC Press ISBN 9780748744473 8.03 Electromagnetic Vibrations, Waves and Radiation by Bekefi and Barrett. The MIT Press ISBN 0-262-52047-8

[@exactempire7854]

@@lecturesbywalterlewin.they9259 thx sir. But I intend to buy a dedicated calssical mechanics book that will serve me also in grad school and I'm eager to know you recommendation.

[@exactempire7854]

@@lecturesbywalterlewin.they9259 thx sir. But I wanna buy a dedicated classical mechanics book and I'm eager to know your recommendation.

[@lecturesbywalterlewin.they9259]

@@exactempire7854 I cannot advise you as I do not know you. Ask your teachers - consider the 3 books with Feynman Lectures.

[@exactempire7854]

@@lecturesbywalterlewin.they9259 thank you very much sir.

[@abhinav-ed1ui]

can someone pls tell me where i can access and attempt these problems that he refers to

[@KeithandBridget]

If you click on Lectures by Walter... above the comments it will go to his home page. Next to Playlists and Community is a magnifying glass icon. Type your search to the right e.g. problem 199, and press enter.

[@abhinav-ed1ui]

@@KeithandBridget thanks a lot

[@zisispontikas944]

Units at both accelerations should be m*s^(-2) @05:13 and after

[@lecturesbywalterlewin.they9259]

yes I noticed that Keith slipped up on the unit

[@KeithandBridget]

@@lecturesbywalterlewin.they9259 You have no idea how many times I have looked at that and not noticed the blindingly obvious!

[@micloue]

Sir, I have a question. How could we construct a polynomial algorithm that determines whether an instance of problem 199 has an integer solution, assuming that P ≠ NP?

[@lecturesbywalterlewin.they9259]

question unclear - use google

[@MRPES-ey8ml]

Sir

[@kawaichanx3]

Ma man

[@hooya27]

Woot! First! Btw, where is the inflection point inside the Earth? Certainly not at the surface.

[@carultch]

It is at the surface, if you assume uniform density. The GPE function of radius is quadratic, and has no inflection point. At the surface, there is an abrupt change from a parabola to a hyperbola, and at that abrupt change, there is an abrupt change from positive curvature to negative curvature. If you account for PREM data instead of uniform density, as I explored, I found that the GPE(r) function appears to be close to a parabolic within the Earth's core, and then it becomes very close to linear within the Earth's mantle, and is tangent to the GPE at the surface, where it abruptly switches to its 1/r behavior.

[@amanrajcreation6023]

You are great teacher but less views ??

[@contexta857]

Coz, people are interested in Instagram more than physic

[@AiimsAspirant-kl5dw]

1 I do not understand this definition. $dQ/dt$ represents the rate of CHANGE of charge flow at an instant even though current is defined as only the charge flow per unit time. Please clear my dought I am students from India preparing for neet examination

[@lecturesbywalterlewin.they9259]

dQ/dt is current

[@AiimsAspirant-kl5dw]

@@lecturesbywalterlewin.they9259 dq means change of charge Mathmaticaly

[@lecturesbywalterlewin.they9259]

@@AiimsAspirant-kl5dw dq is change of charge. dq/dt is current

[@AiimsAspirant-kl5dw]

Please give rely

[@contexta857]

Anyone want see the real craze about there profession should come here.. Just watch it,At the age of 85+ 😶 I remember(physic works and i am still alive)

[@tirejadararjenrojda]

Hello!

[@KeithandBridget]

Apologies to all watching this video. As pointed out in the comments acceleration has units m*s^(-2).

[@lecturesbywalterlewin.they9259]

sorry Keith; I did not view this time your video before posting it. I normally do that and will continue to do that. with my apologies

[@lecturesbywalterlewin.they9259]

I normally also send your video to Eugen but did not do that this time.

[@michaelbruning9361]

The units are also missing in the middle terms a) and c) where you insert the values.

[@KishanLovesAstro]

Sir would you like to join a interview with me for about 10 minutes for a youtube video . Sir I wanna do this if ok can tell me ok if you can't it's ok sir.

[@lecturesbywalterlewin.they9259]

thank you but I am not interested

[@KishanLovesAstro]

@@lecturesbywalterlewin.they9259 sir not a physical interview a zoom interview.

[@lecturesbywalterlewin.they9259]

@@KishanLovesAstro I am not interested

[@KishanLovesAstro]

@@lecturesbywalterlewin.they9259 Ok sir Anyway I respect you so much.