Hello. My name is Alex I am from Kazakhstan and now living in Korea. I am in the 9th grade. I became interested in physics two years ago. I watched your “For the Love of Physics” lecture and read your book. And because of your lectures I started to love physics. I want to become great physicist and physics professor like you. Thank you sir! ❤
Today, you changed the perspective of a student who used to hate physics a lot. I believe you had changed an entire era of life with these teachings. Let Mercy be with you and Thank you! This big heart's for you.❤
Take care of yourself, Professor. Sometimes I was discussing with my mother that some people, even though they are very old, still think as clearly and smartly as they did when they were young. Then my mother told me that the work these people did when they were young must have been outstanding. I think that must be the case. Wish you good health.
You sir have inspired me like no one else ever did. Im preparing for NEET and the lectures was just the thing I needed and a reply from your side would reaallllllly make me happy❤
Though I'm still in high school I aspire to one day reach the level of mastery you have with physics, it truly is beautiful and inspiring. I am truly thankful that I have had the chance to view your content as it has given me a different appreciation for physics. Good luck with your future problems. Sincerely, David
Dr. Lewin, I was wondering if you know about Tumfrico's period experiment. I read some things that relate to Cavendish with gravity. However, every resource I viewed seems to mix in their own narrative. I wonder if you have explained this or might consider giving your own physics explanation.
Hi sir, I am Erfan and I live in Iran and I am interested in physics. I like your book very much. Your teaching and especially your training are wonderful. Thank you for answering my comment❤❤
I dare say that there is a serious issue with the problem terms itself and its solution: the matter is that duration of a "day" on Saturn is 10h33'38" = 38 018 sec but not 24*3600 = 86 400 sec (6:28) day longevity on Earth. So the periods in days are estimated correctly but orbital speed(s) are doubtful. What "days" are used in this problem?
I can confirm that the calculated periods are correct b/c there is a video on YT that shows them all, and I used earth hrs, days, etc in a conversion factor. Also: britannica: "Tethys: sidereal period; Earth days"
Dearest Professor Walter Lewin, we would love you as always, you trained millions of students to become successful for so many years. MIT miss you and do not know if you ever been been replaced…God bless you!
Sir I need an advice…can u pls name some books for a much more practical and conceptual based learning of physics…I am in class 11 and dream of getting into MIT…I saw the lectures of you related to my chapters like atomic structure,work and energy,etc…it will be a great help if u answer…looking forward to it…🙂
Hello Sir! Love your way of teaching and your content. I'll be starting my university this year in 2 to 3 months and i love physics a lot and i need some guidance on which book should i follow to prepare me for the college level physics. Thank you for reading this and take care of yourself sir!
Professor Walter Lewin, through the Gravity Revolution, I am developing a gravity-powered zipline car container and a gravity battery capsule hotel to solve metropolitan traffic congestion and real estate housing problems. I sincerely hope that Professor Walter Lewin's teachings continue to spread widely.
@@lecturesbywalterlewin.they9259It would've been interesting if the "days" in the periods were not Earth sidereal. - Maybe "Saturn days"..? "Scientists Finally Know What Time It Is on Saturn| NASA Science" 🔭 🪐 - Fascinating!
Hello prof!! recently started watching your videos and experiments...and gotta say..I LOVE THEM. I've decided to pursue engineering and i cant wait to look at more of your lectures to help me out with stuff :D
Professor, i am Naveen , how is the introduction to astronomy and astrophysics by Arnold hansleimier , Could you share an advice for aspiring astrophysics like me ?
@@lecturesbywalterlewin.they9259 I have a question of physics? Why the sun appear small during evening time when i see by one eye as compared to two eyes??
Dear Professor let's apply Tungsten mold on a cube of 10Cm3 solid block of Iodine.Now we heat Tungsten so that Iodine molecules dissociate into electronegative iodine atom and draws electron from Tungsten.The Iodine will not be able to withdraw more electrons than 10^18 electrons and form Iodine negative ions.Rest iodine atoms will be intact and try to draw more electrons.If it worked dielectric breakdown is not an issue as at a given point It will not attract more than 10^18 electrons and Iodine atoms will try to attract electrons only not really gains it.Its a hypothetical theory one needs to verify.❤This high voltage is for breaking Water molecules I need your opinion over it.
Sir please its very important me to ask u ,i grown my hairs long so i can focus on study or i thought it helps in concentration is it real? Does long hair's helps in focus or concentration ??
@@lecturesbywalterlewin.they9259 sir im sorry but do u afraid of death?cause u gain so much knowledge and respect money emotions everything and in the next life it will be reset ryt (for me i dont, cause i have nothing haha)or do you believe in god or you believe in chakra's? Btw i wish god would give you my age so it will be good for human kind ❤️
Hello sir, I am a 10th grader in India of CBSE board. I want to be an astrophysicst. So are your lectures in my 10th or I prefer them in 11th to prepare for JEE or any other entrance exam of any reputed college to make my dreams become true.
*I want to be an astrophysicst.* first high school, then college (bachelor's degree), then graduate school PhD in astrophyics. *Go to the best college and best graduate school that will accept you based on your academic performence.*
Hello Sir, I'm Aditya from India and I'm interested in studying at MIT. Currently I am in 11th grade and preparing for JEE 2026. Sir can you please guide me upon admission in MIT for International Students.
Hello professor i am prepairing for neet but i am not that much good in physics but your lecture help me a lot thankyou professor sir please guide me i want to make my parents proud
Sir I have a question regarding thermometers. Please help me sir...🙏 The question is how the sensitivity of glass mercury thermometers increase with the increase of the volume of bulb in the bottom of the thermometer. Please help me sir...😇🥰
most mercury thermometers are used to meaure body temperature. 1 drop of mercury will be enough. No one would use a mercury thermometer to measure temperatues of 100C or more.
@@lecturesbywalterlewin.they9259 Sir this question is included in a exam paper...I understood that this is hypothetic question, But sir they asked a possible reason for this...I cannot understand a reason for this...🥲
@@GayathriLokuge sensitivity means accuracy. The volume expansion of mercury is proportional to its volume. ten times more volume 10 times more expansion which means higher accuracy of the temperature.
Sometimes I go over to Prof Walter Lewin’s page and do his physics problems. Sometimes I can figure them out. One time I was off by such a large margin that he commented on that horrible answer looming in his comment section 😂😭 Y’all have successfully celebratized the physics space and that’s awesome! I suspect that the “woo” you are concerned with has weaker footholds where people are confronted with maths and not just celebrity.
He makes them up every time he posts them. Some are from the textbooks he used in class, some are from his research, some are also from his personal experience.
Watch all my 94 MIT course lectures. Start with 8.01, then 8.02, then 8.03. Do all the homework and take all my exams. *I guarantee you that you will then do very well on the Physics portion of any freshman college or JEE exam* You will find all information you need on this channel in three playlists "Homework, Exam, SolutionsY & Lecture Notes". 8.01 & 8.02 will each take about 200 hours, 8.03 about 250 hours.
His nationality is Dutch American and a retired physics teacher, so he is right not to dwell on that here. His ethnic roots do not dictate his professional status, only his personal life. He has the right to be silent on this if he wishes, so it's best not to push on about it.
Hello professor, i have a doubt there was a exam conducted at my college and there was a question Where is the value of g (gravitational acceleration) lowest a.Moon b.A satellite c.A mine d.At the surface of the earth They didn't specify from where I'm measuring the gravitational acceleration What would be your opinion on this? I answered (b).
satellites and objects in any satellite have no weight bcoz they are in free fall. But the Earth gravitational field keeps them in orbit. If radius of the orbit is 2 Earth radii, the gravtitational field there is 4 times smaller than on the Surface of Earth. The grav acc on the surface of the Moon is 1.6 m/s^2. The grav acc on a satllite whose orbital radius is 4 time the radius of Earth is 16 times smaller than 10 m/s^2. Thus the question is ill-defined as they do not specify the orbit of the satellite.
@@lecturesbywalterlewin.they9259 yes! Because it was ill defined made me very confused I watched many of your videos and I really look forward to becoming like you one-day ! Thank you professor!
