tag:blogger.com,1999:blog-2240954547063076010.post6602857141256782507..comments2017-01-17T11:11:24.596-08:00Comments on Susskind's Blog: Physics for Everyone: Leonard Susskindnoreply@blogger.comBlogger270125tag:blogger.com,1999:blog-2240954547063076010.post-89641814593327267372016-09-22T14:35:37.643-07:002016-09-22T14:35:37.643-07:00I took calc, linear algebra and diff eq 35 years a...I took calc, linear algebra and diff eq 35 years ago and then pursued a career out of science. Would like to learn about tensors to understand Professor Susskinds GR lectures. Tried Schaum's outline but it's too shallow. Can anyone recommend a good tensor calculus textbook?<br />Thanks.John F Khttp://www.blogger.com/profile/00345905882992427000noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-45498547405053988252016-08-29T06:53:37.513-07:002016-08-29T06:53:37.513-07:00Black Holes as neutrino factories? Yes.
Here's...Black Holes as neutrino factories? Yes.<br />Here's a specific mechanism by which Black Holes could emit neutrinos (and evaporate in the process).<br />http://www.math-math.com/2016/08/how-black-holes-could-be-neutrino.htmlKen Abbotthttp://www.blogger.com/profile/07654085244823197611noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-4799710522257478182016-07-13T07:15:48.589-07:002016-07-13T07:15:48.589-07:00Dear Prof
I hope you doing okay, I have been fol...Dear Prof <br /><br />I hope you doing okay, I have been following your lecture videos on youtube for Cosmology, I have a question when you want to solve a(t) in-terms of w, where w=w(t) in other words it is not constant it varies with time. the w(t) from the EoS(Equation of State). please help Prof OR anyone who can be able to help please help me. simther4111@gmail.com that's my email address.Simthembile. Dlaminihttp://www.blogger.com/profile/17547862388135541071noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-91908553555865011192016-07-13T07:12:43.360-07:002016-07-13T07:12:43.360-07:00Dear Prof
I hope you doing okay, I have been fol...Dear Prof <br /><br />I hope you doing okay, I have been following your lecture videos on youtube for Cosmology, I have a question when you want to solve a(t) in-terms of w, where w=w(t) in other words it is not constant it varies with time. the w(t) from the EoS(Equation of State). please help Prof OR anyone who can be able to help please help me. simther4111@gmail.com that's my email address.Simthembile. Dlaminihttp://www.blogger.com/profile/17547862388135541071noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-15852227130233197392016-03-28T00:51:28.407-07:002016-03-28T00:51:28.407-07:00Dear Professor Susskind can you please post the yo...Dear Professor Susskind can you please post the youtube subtitles in the lessons of the latest physics courses on the internet who have none? Thank youindelicatohttp://www.blogger.com/profile/10320478268890612304noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-52389717514998088242016-01-18T02:26:53.840-08:002016-01-18T02:26:53.840-08:00TESTINGTESTINGMAURICE PANEROhttp://www.blogger.com/profile/08598912626122701249noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-25631886771530201672015-12-18T23:14:13.793-08:002015-12-18T23:14:13.793-08:00Dear proffessor Susskind,
I follow your video less...Dear proffessor Susskind,<br />I follow your video lessons with enthousiasm.I also read your books the theoretical minimum.<br />I have a question about timelike and spacelike lecture 3 (about 12 minutes)special relativity.In the one<br />case you can always find a lorentz transormtion to describe the particle motion and in the other case it is not<br />possible.I don't understand why.<br />I also have another question.Is'nt it so that our solar system is a physical system where information travels<br />instantaniously,F=ma requires no time.If this is true than signals travel much much faster than light.<br />Thank you very much in advance.<br />Thank you again for your lectures,without them i couldn't have study eventhough there are some good<br />books out there ex. Fleisch's student guide to vectors and tensors.Gilbert Strangs linear algebra and others.<br />Best Regards<br />Meir KrukowskyMeir Krukowskyhttp://www.blogger.com/profile/15845441141914581597noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-4518492854505384892015-06-08T04:03:53.000-07:002015-06-08T04:03:53.000-07:00IB,IGCSE,A level,AP tuition) BestTutors of Maths,P...IB,IGCSE,A level,AP tuition) BestTutors of Maths,Physics,Chemistry,Economics,Business ManagementContact No: 09899235249 or 09818369374<br />Highly Qualified and an IB Expert with 7 years of rich experience in Teaching Exclusively International School Students for IB, IGCSE and A levels. Excellent and Consistent Results for IB, IGCSE/GCSE O and A Level exam. 70 A *, 65 A, 10 B during last 5 years for IGCSE O Level, Twenty Five 7, eighteen 6, AND nine 5 in IB Maths, Physics, Chemistry, Economics and Business and Management HL. Extremely Adapt in Writing Portfolio,IB labs, Maths,Physics and Chemistry Internal Assesment . No Students have ever got less than B in O Level Exam and less than 5 in IB HL exam. BEST OF STUDY MATERIALS ARE PROVIDED WITH PAST YEAR QUESTION PAPERS FOR PRACTICE Highly organised with extremely systematic method of teaching to cover the course well in advance of Exam and personal care is taken for each student with comprehensive forward planning for Final Exam. Many of my students have got into University of Cambridge, LSE, Warwick, Univ of Nottingham, University of Pennsylvania and Wharton business school for Under-grad courses. Teaching as a hobby has turned out to be a profession for me. I provide home tuition as well as Group Classes with 2-4 students at Greater Kailash(GK-II), New Delhi and Galleria Market (Gurgaon). <br />Contact No: 09899235249 or 9818369374<br />Mail to: ibworldacademy@gmail.com<br />Website: www.ibworldacademy.com<br /><br /><br /><br />IB ONLINE TUTORhttp://www.blogger.com/profile/10522299149123442700noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-81939976091990764382015-06-08T04:02:53.004-07:002015-06-08T04:02:53.004-07:00Contact No: 09899235249 or 9818369374
IB World Aca...Contact No: 09899235249 or 9818369374<br />IB World Academy has been helping students excel in IB Math(HL,SL,Studies), Physics(HL,SL), Chemistry(HL,SL), Economics(HL,SL), and Business Management(HL,SL) by providing the right skills for success. Centrally located near Safdarjang Enclave in South Delhi, we have highly skilled and qualified teachers having over 7 years experience teaching different streams of IB Math, Physics, Chemistry, Economics, and Business Management. Our tutors possess B.Tech, M.Sc. (Math), B.Sc. (Math) and B.Ed. degrees. We measure our success by yours and take pride in delivering the highest quality of education service by using our experience and expertise in this field.We tutor students from Grades 7–12. Our students are from Pathways World School, GD Goenka World School, Shri Ram School, and American Embassy School, Lancers International School, Scottish High School, and other reputed IB schools in Delhi and Gurgaon. We have tutors with many years experience teaching International Baccalaureate (IB) Diploma, IGCSE. We provide one-to-one customized sessions between the tutor & student. We’re reputed for our outstanding results and proven success year after year. <br />IB World Academy is a leading exam preparation institute in Delhi and specializes in preparing students for GMAT, GRE, SAT, SSAT and LSAT exams. <br />IB World Academy has special programs for achievers, talented and mature students. Our unique approach allows us to work with each student and help us improve their overall score. We help students learn their subjects quickly and in a smarter way. IB World Academy is open 7 days/week from 8am – 10pm and the tutoring sessions with the instructor can be scheduled at your convenience. <br />Our extensive experience with the curriculum and unique teaching methods allows students to improve confidence, develop higher self-esteem, remove academic frustrations and achieve better grades. We ensure that each student achieves academic success which helps them well beyond their years in school by preparing them for future challenges and opportunities.<br />IB/AP EXPERT TUTORS<br />MOB NO:+91-9899235249 OR +91-9818369374<br />EMAIL ID: ibworldacademy@gmail.com<br />Website: www.ibworldacademy.com<br /> www.ibglobalacademy.com<br /><br /><br /><br />IB ONLINE TUTORhttp://www.blogger.com/profile/10522299149123442700noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-55170282697176908202015-06-08T04:02:45.825-07:002015-06-08T04:02:45.825-07:00Contact No: 09899235249 or 9818369374
IB World Aca...Contact No: 09899235249 or 9818369374<br />IB World Academy has been helping students excel in IB Math(HL,SL,Studies), Physics(HL,SL), Chemistry(HL,SL), Economics(HL,SL), and Business Management(HL,SL) by providing the right skills for success. Centrally located near Safdarjang Enclave in South Delhi, we have highly skilled and qualified teachers having over 7 years experience teaching different streams of IB Math, Physics, Chemistry, Economics, and Business Management. Our tutors possess B.Tech, M.Sc. (Math), B.Sc. (Math) and B.Ed. degrees. We measure our success by yours and take pride in delivering the highest quality of education service by using our experience and expertise in this field.We tutor students from Grades 7–12. Our students are from Pathways World School, GD Goenka World School, Shri Ram School, and American Embassy School, Lancers International School, Scottish High School, and other reputed IB schools in Delhi and Gurgaon. We have tutors with many years experience teaching International Baccalaureate (IB) Diploma, IGCSE. We provide one-to-one customized sessions between the tutor & student. We’re reputed for our outstanding results and proven success year after year. <br />IB World Academy is a leading exam preparation institute in Delhi and specializes in preparing students for GMAT, GRE, SAT, SSAT and LSAT exams. <br />IB World Academy has special programs for achievers, talented and mature students. Our unique approach allows us to work with each student and help us improve their overall score. We help students learn their subjects quickly and in a smarter way. IB World Academy is open 7 days/week from 8am – 10pm and the tutoring sessions with the instructor can be scheduled at your convenience. <br />Our extensive experience with the curriculum and unique teaching methods allows students to improve confidence, develop higher self-esteem, remove academic frustrations and achieve better grades. We ensure that each student achieves academic success which helps them well beyond their years in school by preparing them for future challenges and opportunities.<br />IB/AP EXPERT TUTORS<br />MOB NO:+91-9899235249 OR +91-9818369374<br />EMAIL ID: ibworldacademy@gmail.com<br />Website: www.ibworldacademy.com<br /> www.ibglobalacademy.com<br /><br /><br /><br />IB ONLINE TUTORhttp://www.blogger.com/profile/10522299149123442700noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-16186264594160134142015-04-25T22:08:28.745-07:002015-04-25T22:08:28.745-07:00Dear Professor,
I understand that one of the thin...Dear Professor,<br /><br />I understand that one of the things that raises some physicists eyebrows about the Holographic Principle is that it maps information from 3 spatial dimensions onto a 2-dimensional surface. <br /><br />I am perplexed as to why only 3 dimensions are considered ... if M-Theory is correct, then wouldn't information from the 11 dimensions of subatomic strings have to be mapped as well? <br /><br />Would 11-dimensional gravitons (if they in fact exist) also be part of the information stored on the 2-dimensional surface like everything else? <br /><br />A Lapsed Physicist.Duncan Deepcoverhttp://www.blogger.com/profile/13431943906813402473noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-59311877423650264192015-04-15T18:39:28.007-07:002015-04-15T18:39:28.007-07:00How can we consider the surface of a black hole as...How can we consider the surface of a black hole as a hologram representing the interior if it is so chaotic?John Fisterehttp://www.blogger.com/profile/05814723712800510706noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-50185774401052679082015-02-26T09:31:32.907-08:002015-02-26T09:31:32.907-08:00I am trying to get a better understanding of quant...I am trying to get a better understanding of quantum mechanics and your book Quantum Mechanics The theoretical minimum and your lectures in the subject have made this possible. Thank You.<br />My question is the equation in page 285. How is the second equation derived from the first? How can Fi(x,t)be equal to both these equations?L Nigogosianhttp://www.blogger.com/profile/03964645866087161974noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-18086991583602950542014-12-31T21:03:22.042-08:002014-12-31T21:03:22.042-08:00sir the carnot cycle is an idealised cycle and it ...sir the carnot cycle is an idealised cycle and it was suppossed to be reversible..the refrigerator concept was based on this assumption of reversibility...yet refrigerators has been made in reality..how is that possible??Srijita Mukherjeehttp://www.blogger.com/profile/13724061845664137450noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-82358821711695949852014-12-29T17:52:10.278-08:002014-12-29T17:52:10.278-08:00Dear Sir,
Could time be the torch that lights th...Dear Sir, <br /><br />Could time be the torch that lights the Hologram?????Alistair Hendryhttp://www.blogger.com/profile/06965504334858377599noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-14137408703851045412014-12-29T17:50:02.528-08:002014-12-29T17:50:02.528-08:00Could Time be the Torch that lights the Hologram??...Could Time be the Torch that lights the Hologram???Alistair Hendryhttp://www.blogger.com/profile/06965504334858377599noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-68094512539703362312014-12-08T11:18:23.531-08:002014-12-08T11:18:23.531-08:00This comment has been removed by the author.Ramez Ghosnhttp://www.blogger.com/profile/13128252192076040406noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-59752446607739283902014-10-07T18:56:36.638-07:002014-10-07T18:56:36.638-07:00
Dr. Susskind , antiparticle and particle both ar...<br />Dr. Susskind , antiparticle and particle both are formed in space everywhere as Stephen hawking said and then annihilate then this process requires energy to form particle and antiparticle?also which particle and antiparticle is formed?saurabh jankathttp://www.blogger.com/profile/02970311274024326089noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-26212804334467487622014-10-07T18:54:13.637-07:002014-10-07T18:54:13.637-07:00This comment has been removed by the author.saurabh jankathttp://www.blogger.com/profile/02970311274024326089noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-12403274155981401032014-10-07T18:45:53.599-07:002014-10-07T18:45:53.599-07:00This comment has been removed by the author.saurabh jankathttp://www.blogger.com/profile/02970311274024326089noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-27342793480423849162014-08-20T18:08:50.833-07:002014-08-20T18:08:50.833-07:00I would like to ask you for a way to understand th...I would like to ask you for a way to understand the Doppler shift from the point of view of photons. It would seem one can have any photon energy one wishes merely by changing the relative velocity between the photon source and the photon detector. If an interaction is required to change the photon energy, how would you describe the interactions in the case of Doppler shifts.?S Alanhttp://www.blogger.com/profile/03469785177521469288noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-57684474323954092272014-08-06T06:25:27.816-07:002014-08-06T06:25:27.816-07:00I just solved the example i posted earlier today: ...I just solved the example i posted earlier today: If a train moves with 2/3 of te speed of light(c) relative to a station and inside the train is a car that also moves with 2/3 c relative to the train(in the same direction as the movement of the train), then how fast is this car moving relative to the station?<br />In this calculation omega is represented by @. The formula's i can be found in Susskinds lecture about special relativity that was uploaded to YouTube on 15-07-2008. He said he left it as an exercise. For those of you who didn't manage to solve it(like me until this morning), Here ya go :)<br /><br />cosh@= 1/(1-(2c/3)^2/c^2)^(1/2)<br /><br />cosh@= 1/0,7453....<br /> = 1,3416....<br /><br />@= inverse cosh(1,3416....)<br /> = 0,8047....<br /><br />2*0,8047....=1,6094....<br /><br />cosh(1,6094....)= 1/(1-v^2/c^2)^(1/2)<br /><br />(1-v^2/c^2)^(1/2)= 1/2.5999....<br /><br />(1-v^2/c^2)^(1/2)= 0,3846....<br /><br />1-v^2/c^2= 0,1479....<br /><br />1-0,1479....-v^2/c^2= 0<br /><br />v^2/c^2= 0,8520....<br /><br />v^2= c^2*0,8520....<br /> = 7,6580....*10^16<br /><br />v= (7,6580....*10^16)^(1/2) <br /><br />v= 2,7673....*10^8Bart Kwezelstaarthttp://www.blogger.com/profile/14804606224545652333noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-32307616837341718882014-08-06T03:30:54.722-07:002014-08-06T03:30:54.722-07:00Hey Lenny,
Great work! I am in high school and i ...Hey Lenny,<br /><br />Great work! I am in high school and i am making a paper about special relativity. I was a bit confused when Susskind suddenly made a 'guess' while we were deriving. Thanks for posting the missing links!<br />I have a question though: <br />When it came to measuring the relative velocity between frame3 and frame1, Susskind said that you could just add the hyperbolic angle that corresponds with the relative velocity between frame2 and frame1, to the to the hyperbolic angle of frame 3 to frame 2. I made an example but i did not end up with a propper answer: (v= 3, ...m/s) <br />Could someone work out the right solution to the folowing exmple?<br />The relative velocity between a train and it's station is 2/3 of the speed of light. In the train is a car. The car and the train have a ralative velocity of 2/3 of the speed of light in the same direction as the velocity from the train relative to the station ( this to disclaim that the car might be standing still relative to the station. What is the velocity of the car relative to the station? <br />Thanks in advance to the person who solves this :)<br /><br />regards from Holland, <br />Bart<br /> Bart Kwezelstaarthttp://www.blogger.com/profile/14804606224545652333noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-35077587298783842032014-07-28T17:42:11.678-07:002014-07-28T17:42:11.678-07:00Is it a coincidence that there are the same number...Is it a coincidence that there are the same number of constraints in the Riemannian integral(cosmology course) as there are group particles in the Standard Model SUSY and Grand Unificaiton course)?Unknownhttp://www.blogger.com/profile/17578330526627925843noreply@blogger.comtag:blogger.com,1999:blog-2240954547063076010.post-8870533952593245522014-06-01T10:20:01.983-07:002014-06-01T10:20:01.983-07:00Dear Mr. Susskind.
First of all thanks a lot for g...Dear Mr. Susskind.<br />First of all thanks a lot for giving these lectures. I've watched a lot them and it's been real fun!<br />I have a question that puzzles me since years. I hope it's physical enough and not too philosophical.<br />It's about quantum mechanics and it's about what exactly the reason is, why a quantum theory cannot be formulated with either classic laws or at least classic probabilities. Here's my understanding...<br />1) There's a class of experiments like measuring the spin of an electron along an axis that only give binary answers like totally "up" or totally "down"<br />2) Repeating exactly the same experiment might give a different answer<br />It follows that the behavior of the electron cannot be deduced from a single experiment. Instead one has to do many experiments and the relative numbers of ups and downs give a probability. It then follows that one invents a theory that describes these probabilities as good as possible and the result are quantum mechanic probabilities, which are not even like classical probabilities (Bell's theorem violated, etc.).<br />But what, if some day in the future, someone could measure a new, so far undiscovered, "thing", e.g. a new property of elementary particles or a new field or whatever. If it turned out that this new "thing" was not binary but real-numbered and if it turned out that this new "thing" determined whether the spin at the end of the experiment was up or down, wouldn't it then be possible to throw away quantum mechanic probabilities and come back to a theory that is either totally classic or at least only involves classic probabilities?<br />To put the question another way: Apart from the observational fact (which I of course accept), that spin measurements so far only give binary answers, is there any other logical argument that would prevent a future experiment from bringing particle physics back to classical physics or at least to classical probabilities?<br />Thanks<br />Volker<br />Volker Dieselhttp://www.blogger.com/profile/16379841910962900471noreply@blogger.com