Careers: Physics - Physics - Science

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About Daniel Mazur
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Expertise
Questions anyone (teenager, undergrad, graduate, professional) may ask on physics, mathematics or inorganic chemistry. Questions may concern subjects themselves or a possible future career in them, if you need advice on a school or hobby project, or you just came across a question that is beyond your current curriculum. I answer bare textbook problems sometimes, but I reserve the the right to redirect you to Physics-Physics section. The kind of questions I like to answer: I just started having science classes at school and they seem difficult, but I enjoy them. Where do I find more information on this, which is not in textbooks but still comprehensible to me? Just leaving high school, and I feel science is really the thing for me. Can you recommend a school and an undergrad program suitable to my inclinations? I am in my second undergraduate year in Physics. We learned the basics of universe expanding this year, the Hubble constant and all that, but invited speakers that gave talks on astrophysics in our department seemed not to agree with this model at all. Is it of any use at all? I am building a [materials research] experimental device for my masters/doctorate thesis and I have the following problem:... I have tried ..., but it still doesn't work. Where might the problem be?

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Questions Answered By Expert Daniel Mazur
In Category Careers: Physics

Subject	Date Asked

first equation of kinematics	3/10/2010
Q: x(t)=x(0)+v(0)t+ 1/2a t^2 does this come from the taylor formula that f(x)= f(0) + f'(0) *x /1! + ... A: no, the kinetic formula does not come from the Taylor expansion. The kinetic formula is exact, while ...
Magnetic fields	3/9/2010
Q: 1st year college: Sir, is the static magnetic field around a magnet truly always there, or is it an ... A: [Q]there is no way to detect a static magnet field without using something to interact with it[/Q] ...
astrophysics or theoretical physics	2/14/2010
Q: I'm a 18 year old Leaving Cert student from Ireland and I'm torn between choosing Astrophysics or ... A: in both astrophysics and theoretical physics you will need to learn a lot of maths. However, what ...
physics or engineering	2/11/2010
Q: anyway I've been wondering whether it is best for me to pursue physics or engineering. Oh I didn't ... A: let me assure you that none of your questions has been annoying so far. It is sometimes ...
another strange question	2/10/2010
Q: Can you help me with this somehow strange looking easy question by checking my answer: a motion of ... A: you should use more parentheses, so the terms are absolutely clear. I interpret the given equation ...
indepth question in physics 1	2/10/2010
Q: since I have it on pdf and I don't want to mistake in typing and that there is a picture in it I ... A: You are right, I made a mess. I should have corrected part a) as well. The bumper-to-bumper ...
indepth question in physics 1	2/9/2010
Q: since I have it on pdf and I don't want to mistake in typing and that there is a picture in it I ... A: yes, the problem for b) and c) is modified in terms of the separation d between the fast cars. The ...
indepth question in physics 1	2/8/2010
Q: since I have it on pdf and I don't want to mistake in typing and that there is a picture in it I ... A: I am familiar with an earlier edition of that book. The problem touches a surprising, yet practical ...
Intelligent Design	1/26/2010
Q: This is not a physics question as such. It's about darwin's theory and the evidence against it. I ... A: my apologies for responding this late. You have put your finger very well on the problem with the ...
NASA jobs requirement	1/25/2010
Q: I am doing my high school now.What are the courses should I study to get a job in NASA? A: NASA hires people from many fields and at high school you just take all sciences and mathematics. As ...
Intelligent Design	1/25/2010
Q: This is not a physics question as such. It's about darwin's theory and the evidence against it. I ... A: as we are not discussing physics, I will try to be brief this time without omitting anything ...
Intelligent Design	1/24/2010
Q: This is not a physics question as such. It's about darwin's theory and the evidence against it. I ... A: that's a lot of questions bundled up together. And as you rightly observed, they are not physics ...
Bouyancy	1/21/2010
Q: I'm currently studying hydrostatics and I have got a problem I just can't sort out myself. While ... A: Yes Anthony, that is exactly right. A cube immersed in oil will be buoyed by it and the buoyant ...
Bouyancy	1/21/2010
Q: I'm currently studying hydrostatics and I have got a problem I just can't sort out myself. While ... A: if you quoted me exactly, I should have written that "the pressure depends on the depth *of ...
momentum	1/19/2010
Q: can you explain why an inflated balloon shoots off when is air is released? age 13 A: Yes Ayesha, But let's start at the beginning. Most balloons are pressurized in order to inflate. ...
Earth's magnetism	1/17/2010
Q: What I know of the earth's magnetism is that it is basically caused by currents inside the surface ... A: the Earth's magnetic field is a sum of field produced by internal currents (especially the molten ...
Spark gaps	1/17/2010
Q: When I run a high voltage current through a single ordinary wire, there is no obvious interference ... A: let me start with this: Interference happens in both cases, the difference is in the magnitude of ...
I want to no if I have the answers right! I picked (B) for the 1st question and then (C )for question 2	1/14/2010
Q: 1.If you’re aerobically fit, you can A. quit your normal exercise routine without any negative ... A: this is not my area, but I understand the terms as I used to coach athletes. And I went to gym while ...
changing major	12/5/2009
Q: respected sir, i just wanted to know whether someone with a bachelor in engineering is eligible for ... A: In the USA the switch is possible, I don't know anywhere else in the world, where this is the case. ...
PhD in Europe	12/1/2009
Q: I did Master of sciences in Physics from IIT-Delhi INDIA. I am interested in condensed matter ... A: capitals of all European countries have good universities, there is no best one. Other large cities ...
Masters and Phd in Physics	11/30/2009
Q: I have completed my BTech in "Engineering Physics" from IIT Delhi. I am very much interested in ... A: there is a downside to almost everything, when you make a step like going back to school, you need ...
resistor	11/28/2009
Q: why donot a resistor acts as a inductor in AC circuit? A: Moni, a real resistor does or can act as an inductor and/or capacitor, really. Our considerations ...
physics vs. eng. physics degree?	11/27/2009
Q: Next fall I will begin my B.S. in either physics or in engineering physics. I am having a hard time ... A: I have a feeling that you know, what professional life you'd like to lead after the school and think ...
Forces	11/16/2009
Q: I once again want to go back to the problem of what forces and masses are. Though we have discussed ... A: Yes Shikhin, this is correct. To go a bit of polishing I would remark that instead of [Q]The first ...
Forces	11/15/2009
Q: I once again want to go back to the problem of what forces and masses are. Though we have discussed ... A: Well Shikhin, the reason for [Q]The question then is, why does it distribute itself so as to cause ...
Forces	11/14/2009
Q: I once again want to go back to the problem of what forces and masses are. Though we have discussed ... A: it depends on the nature of the interaction that you impose on your particles. But as you have ...
capacitor	11/10/2009
Q: Let me translate my question from my book (if I can do so): We have the capacitor with capacitance ... A: [Q]We have the capacitor with capacitance 13.5 pF it charged with a battery with the potential ...
graduate school	10/29/2009
Q: i am an immigrant who came to the U.S. some 10+ years ago. Here i did poorly in academics, and it ... A: I think that in your situation it is very much given: 1) poor academic history both in length and in ...
Gauss's law and Ampere's law	10/26/2009
Q: Consider any imaginary closed surface and a charge q located outside it. Now the gauss's law states ... A: I appreciate the advance you've made in your electrostatic study. Regarding your hollow shell as ...
Gauss's law and Ampere's law	10/25/2009
Q: Consider any imaginary closed surface and a charge q located outside it. Now the gauss's law states ... A: for your first problem, you need to understand, what "net flux" means. It does not mean "no flux ...
A Career in Physics	10/24/2009
Q: Currently, I'm a seventh grader who has a dream of pursuing a career in mathematics or science. My ... A: What degree do you have to at least earn? I know experimental physicists, who have a Master's ...
electrostatics	10/20/2009
Q: First of all I'm sorry for using nonsensical terminology. I do understand, with absolute clarity, ... A: [Q]So the statement that the system will try to decrease it's pot. energy is just another way of ...
electrostatics	10/15/2009
Q: First of all I'm sorry for using nonsensical terminology. I do understand, with absolute clarity, ... A: I accept your explanation. At the same time I must require for you to not write vaguely and ...
physics higher studies	10/13/2009
Q: I will complete my B.Tech. in computer sciences in july 2010 from NIT,Kurukshetra(India).But I am ... A: I guess first you could read all the answers I wrote to your fellow students today and over the past ...
Electrostatics	10/13/2009
Q: There are two conceptual problems that have been worrying me since pretty long. I've tried to reason ... A: Question 1: [Q] This field is same at every point in space and doesn't increase or decrease if we ...
Clarification regarding admission to Phd program	10/13/2009
Q: I am senthilnathan. I wish to pursue phd in astrophysics in abroad. Which country is best for phd in ... A: the TOEFL applies to English-speaking countries: United Kingdom, USA, Canada, Australia, New ...
Electrostatics	10/11/2009
Q: There are two conceptual problems that have been worrying me since pretty long. I've tried to reason ... A: the answer to the first question is relatively easy. But one must first understand, that the battery ...
career guidance	10/11/2009
Q: Sir,I am really interested in physics and i wish to work for NASA, its my ambition.But i am really ... A: you need to take your education plans from a different point of view. NASA are hiring people from a ...
Relation between electricity and magnetism	10/5/2009
Q: I have one little doubt that I'd like to clarify befor I move on to the main question of the ... A: I apologize for the delay, I have been on holidays without posting it up on AllExperts site. [Q] If ...
Orbit Time x ?	10/3/2009
Q: Orbit Time x ? I am so excited about this question, For the sake of the question let's ... A: I am not sure I understand your formulation of the problem. Allow me to re-state it in my own words ...
thermal radiation	10/1/2009
Q: I read about stefan's law and black body radiation. But I don't really understand what does it mean ... A: black body radiation is electromagnetic, because it is considering vacuum as the medium, where the ...
reversible and irreversible processes	9/16/2009
Q: I just can not get my head around this idea of reversible processes. This is what I know. A quasi ... A: the asymmetry that troubles you is difficult to prove without the proper (complicated) maths. ...
reversible and irreversible processes	9/15/2009
Q: I just can not get my head around this idea of reversible processes. This is what I know. A quasi ... A: once state variables are not defined, energy (heat) transfer to and from walls can be described only ...
reversible and irreversible processes	9/14/2009
Q: I just can not get my head around this idea of reversible processes. This is what I know. A quasi ... A: Firstly, when you suggest your non-equilibrium process ("the pressure and temperature will be ...
zero point particle production	9/14/2009
Q: I am a non-scientist adult but very curious about quantum physics. I read that quantum theory ... A: the way I understand it - being an experimentalist and not a theorist - the particle pairs do not ...
Career	9/10/2009
Q: I am a student of class 12 I really want to become a physicist. What should I do after school? A: I take 12th grade meaning the final grade of the senior high-school. If you want to become a ...
How the physics is useful to a computer Students	9/10/2009
Q: Respected Sir, I am a post graduate in the physics (Basically I am from INDIA)and i would like to ... A: I understand there are two questions in what you ask: 1) what use is physics to programmers and 2) ...
intensity and frequency of light	9/10/2009
Q: how the energy of light that is responsble for the intensity of light is different than that for the ... A: Versha, light consists of photons, which are energy quanta. Energy of a single quantum is related ...
isothermal processes	9/9/2009
Q: In an isothermal process, say a process on an ideal gas in a a container fitted with a light, ... A: that version of the Second Law of thermodynamics speaks about efficiency of cycles (engines, ...
Career in theoretical physics	9/3/2009
Q: Sir, I am doing my second year of electronics and communication engineering in PSG College of ... A: My sincere apologies for answering this late. Even in the USA, where you are allowed to start a ...
advice	8/31/2009
Q: I'm currently in an associates bio-tech program. but my love is physics, i like black holes, light ... A: Karl, the answer is "almost certainly no". In my opinion no-one can learn all the undergraduate ...
Physics and energy production	8/27/2009
Q: I am 29 and am interested in getting into studying the areas of energy production, and possibly ... A: through science or engineering it is possible (quite usual in fact) to specialize in alternative ...
seeking a career	8/27/2009
Q: i curently don't know what to study when i leave high school' but i'm good in Maths,Science and ... A: with interest in physics and good marks in maths and science you have a huge number of options. You ...
Entropy	8/27/2009
Q: This is the first time I've started studying the topic of thermodynamics in any detail. It's the ... A: entropy is indeed a measure of randomness in a system, but you cannot start understanding it from ...
advice	8/22/2009
Q: I'm currently in an associates bio-tech program. but my love is physics, i like black holes, light ... A: M.D.'s are paid a lot because they have a lot of responsibility in their work - their decisions ...
Modern Scientific Approach	8/19/2009
Q: This is regarding the definition of "SCIENCE". The most widely availible definition out there is ... A: people, scientists do try and find the answers to deeper questions, but the most they can do is to ...
Rotation	8/18/2009
Q: Still wanted to discuss a little more about it. Consider the plank again. In free space, if I apply ... A: it is an error to think that the F' as a result of F acting away from COM diminishes from point of ...
Rotation	8/16/2009
Q: Still wanted to discuss a little more about it. Consider the plank again. In free space, if I apply ... A: Shikhin, I don't know, if I will answer this time around, what you are trying to get at, but I ...
physics	8/12/2009
Q: please i want to where a physics electronics graduate can work, and what are the types of jobs they ... A: a physics electronics graduate can work in national laboratories of many countries, universities or ...
Quantum mechanics and astrology....	8/5/2009
Q: I wanted to discuss a very interesting thing with you. You may not have an exact explanation for ... A: I didn't know about his Nadi Astrology at all before you mentioned it. I will tell you my opinion, ...
Adopting a subject as a hobby	8/4/2009
Q: I was planning to enhance my skills of Engineering Drawing in which I am very much interested. ... A: my apologies for the late answer, after vacations I had to solve some issues at work.... Without ...
rotation	8/4/2009
Q: Hope you had a nice vacation. I wanted to still discuss the rotation model that i gave previously. ... A: the experimental fact is that the plank starts to rotate, hence the force F acting in a point at a ...
career in TP	7/11/2009
Q: I just read another answer of yours to a guy called ankit, I guess, and you said that it requires a ... A: Shikhin, I think that you can plan on 20-30 credit hours of school per semester, which is 4-6 hours ...
Energy	7/11/2009
Q: I wanted to understand what energy really is and I thought about it, and my explanation is as ... A: Shikhin, about the forgotten force perpendicular to velocity: The amount of work a moving object ...
Limits	7/10/2009
Q: Wanted to discuss the idea of limits. I understand the idea but still sort of feel a little ... A: Shikhin, the difference between (x^2 - 4)/(x - 2) and (x + 2) is ONLY that the former expression ...
M.Sc in Physics	7/10/2009
Q: I have graduated this year with a B.Sc in Physics from Mumbai University, India. My score in the ... A: my apologies for answering late. Yours is a question that would be best answered by some kind of ...
career in TP	7/10/2009
Q: I just read another answer of yours to a guy called ankit, I guess, and you said that it requires a ... A: I am the last one to say things cannot be learned from textbooks. It is possible. You need to ...
career in TP	7/9/2009
Q: I just read another answer of yours to a guy called ankit, I guess, and you said that it requires a ... A: I noticed that the syllabus at http://web.iitd.ac.in/~physics/course/ep_syl.htm does not mention any ...
Energy	7/9/2009
Q: I wanted to understand what energy really is and I thought about it, and my explanation is as ... A: My answer may this time rather confuse you, because energy is a very (and unexpectedly so) abstract ...
RE: A path to Theoretical/Research Science?	7/8/2009
Q: I'm am currently a freshman at university and I'm pursuing a Bachelors degree in Engineering. I ... A: Nanotech is just an applied branch of Solid state physics (SSP). It is a highly specialized field in ...
differential equations	7/7/2009
Q: I had some conceptual problems with differential equations. Though I can solve them and am familiar ... A: Shikhin, Ad problem 1: The reason many equations have inseparable variables is the same as why ...
A path to Theoretical/Research Science?	7/5/2009
Q: I'm am currently a freshman at university and I'm pursuing a Bachelors degree in Engineering. I ... A: there is no law against it but it IS impossible for most people. An engineering Bc will give you ...
rotation......continued....	7/3/2009
Q: The site won't allow me to ask more follow ups, but I am just not able to chew manythings. Not to ... A: My apologies for the problem solving suggestion, in your situation it's really redundant. [quote] ...
Permutations & combinations	7/2/2009
Q: I'm back with math again. There's a question I recently went through which is as follows: " Q.) In ... A: in the problem "In how many ways can a pack of 52 cards be divided among four players equally?" you ...
why do things rotate?	7/1/2009
Q: Another question I was wondering about and figured out an explanation to myself. Would like you to ... A: Shikhin, firstly, you need to first properly study the implications of "non-atomic Universe". Our ...
why do things rotate?	6/30/2009
Q: Another question I was wondering about and figured out an explanation to myself. Would like you to ... A: today there wasn't much problem answering your questions in lengthy ways, at work I just happened to ...
gravitons, gluons, w & z boson, photon	6/30/2009
Q: I'm sorry for asking too many questions in a single day. Please take your time if it bothers you. ... A: this is really not my branch of physics, nor does this belong to the undergraduate curriculum that ...
why do things rotate?	6/30/2009
Q: Another question I was wondering about and figured out an explanation to myself. Would like you to ... A: I find your microscopic reasoning quite correct, i.e. the way your force is distributed from the ...
Understanding Force	6/30/2009
Q: I want to understand what a "force" actually is and what a mass actually is. This is how I tried ... A: yes, you've nearly got it - just some word polishing needed. When two particles (objects) do ...
Understanding Force	6/30/2009
Q: I want to understand what a "force" actually is and what a mass actually is. This is how I tried ... A: momentum is defined as the measure of object's "tendency to keep its state of motion". In other ...
archemedes principle	6/29/2009
Q: Archemedes principle says that the a bouyant force equal to the weight of the volume of the fluid ... A: I think that the most straightforward way to illuminate this is via the energy bilancing. It is a ...
Understanding Force	6/29/2009
Q: I want to understand what a "force" actually is and what a mass actually is. This is how I tried ... A: you are asking deep questions here, but perhaps some of them can be satisfactorily answered. Allow ...
Physics entrance exams/Charles University	6/29/2009
Q: firstly just want to thank you for your time. I'm currently a 4th year experimental physics student ... A: as I understand it, applying for Master's program in Physics you take entrance exam in Physics only. ...
Guidance to join best university of physics in Europe	6/23/2009
Q: How are you? I am Vinoth from INDIA! I am currently working as a Software Engineer in one of the ... A: it has the potential to help more people than one. 1) Yes, you are eligible to apply, because you ...
beginner's physics - basic mechanics problem	6/16/2009
Q: ACCELERATIONS for SAME FORCE on DIFFERENT MASSES A force F of 1.98 N acting on a mass m1 results in ... A: this is not a complicated problem, I'll be glad to give you a push in the right direction. It all ...
Role of computer programming in physics research.	6/16/2009
Q: A question related to the preparation for doing physics. Do I need to learn (as a physics student) ... A: The short answer is that yes, during a physics curriculum (the earlier the better, in the freshman ...
Higher studies in quantum mechanics	6/12/2009
Q: . I am currently in a high school doing pre-medical. After my high school, I want to continue ... A: this depends on the demands of the individual universities and departments. Take United States for ...
Mathematics problem	6/12/2009
Q: . I am a high school student doing pre-medical but I want to continue my career in the field of ... A: At most universities you can apply, no matter what your high-school studies. But at the same time, ...
physics	6/11/2009
Q: i am a student of 3rd year bsc in physics and my degree is a 3 year degree. my question is that is ... A: yes, Master's degree from India does mean an advantage. What is "sufficient qualification" is always ...
About planets and gravity.	6/11/2009
Q: I am curious about something so decided to ask you. We know that according to Newton, the planets ... A: When you try to describe gravity, you can EITHER do it using a "straight" Universe and gravitational ...
The number 'e'	6/7/2009
Q: I'm asking all mathematics questions here. I know. But I really like your explanations and would ... A: forgive me the delay, please, I have had a lot on my plate lately. As far as I remember, the number ...
Physics	6/5/2009
Q: I have completed my B.Sc in physics from India. I scored 73% in it. I took a gap year to study for ... A: yes, I apologize for not addressing your interest in fusion earlier. Well, one source of information ...
Physics	6/4/2009
Q: I have completed my B.Sc in physics from India. I scored 73% in it. I took a gap year to study for ... A: your gap and/or age will almost certainly not affect your admission chances at Ph.D programs around ...
permutations doubt	6/3/2009
Q: I'm back again with another math doubt from permutations. The question is : "There are six periods ... A: without any maths I can tell you that the second method is wrong, because the problem statement does ...
impact and force	5/28/2009
Q: Two students were playing in a gymnasium, they were chasing each other. The boy was 6'4" and weighed ... A: Chris, I am not at all sure, if I get the problem questions right. If I understand it correctly, ...
physics	5/27/2009
Q: i am a student of 3rd year bsc in physics and my degree is a 3 year degree. my question is that is ... A: the list of your achievements is impressive, congratulations. Publishing the solutions is a good ...
getting wet with rain	5/26/2009
Q: When rain (with constant velocity), if you want walk from one place to another place how can you go ... A: generally the fastest speed possible should minimize the wetness, but there are complications with ...
Higher studies in quantum mechanics	5/25/2009
Q: . I am currently in a high school doing pre-medical. After my high school, I want to continue ... A: from a pre-med to physics, that is a big leap. You should also tell me (follow-up?), what you intend ...
physics	5/20/2009
Q: hi is it absolutely impossible to break magnetic field lines? A: Absolutely. In order to break magnetic field lines the magnetic monopoles would have to exist. These ...
About topics to specialize in.	5/20/2009
Q: This is Siddharth. I am sorry to bother you again. I have been thinking about everything you wrote ... A: you don't need to know field theories to study string theory. You only need to get a suitable book ...
physical science	5/19/2009
Q: What is the purpose of compiling and presenting information in a scientific paper? A: the purpose is simply to let other scientists and public know, what we have found, discovered. ...
Regarding the topics to choose for self preparation.	5/18/2009
Q: How is everything with you? Perhaps you remember me, I am Siddharth Ahuja, 26 years old, from India. ... A: it's nice to hear that I helped, I hope to be as useful again. It sounds to me, as if you are now ...
apparent distance	5/15/2009
Q: The star nearest the Earth is Proxima Centauri, located at a distance of about 4.2 light years. If ... A: there is nothing in the answer to your question that would require more that putting numbers into ...
understanding calculus	5/14/2009
Q: I know i should be asking this in the mathematics section, but i don't want formal mathematical ... A: I think that it is a matter of a point of view and the extent to which we can non-mathematically ...
career : physics	5/13/2009
Q: Another thing i was recently wondering was that now since, there is so much of anti asian stuff ... A: I hope you don't consider me an expert on this subject, this is a political, sociological and ...
cell phone/bluetooh radiation	5/12/2009
Q: I am a 6th grade and I am doing a project on cellphone and bluetooth radiation. I was wondering if ... A: Bluetooth or any other radio-frequency radiation does not cause brain damage. At least there has not ...
A CAREER IN PHYSICS	5/11/2009
Q: Q: Sir,I'm in my 1st year of Elctronics and Communication Engineering at PSG College of ... A: indeed, I misunderstood you. In your case then please do your best to get the best possible grades ...
Career in Physics	5/9/2009
Q: I have always thought of being a physicist but I don't have enough information about it, so i hope ... A: there is no single book that would cover all branches of undergraduate physics to sufficient depth. ...
Ph.D. Physics	5/9/2009
Q: I am a 32 years govt. employee in India completed M.Sc.Physics in 2000 . Though I am not a brilliant ... A: in order to go to R&D, it is almost imperative that you get a Ph.D. No matter what age you are, in ...
A CAREER IN PHYSICS	5/9/2009
Q: Q: Sir,I'm in my 1st year of Elctronics and Communication Engineering at PSG College of ... A: you situation is not going to be easy, but if you are determined as you say, it will be manageable. ...
which course to chose?	5/5/2009
Q: I gave the IIT entrance exam this year, the results not out yet but you can calculate your marks as ... A: I apologize for taking this much time to answer, it has been a very busy week. I had a look at the ...
which course to chose?	5/4/2009
Q: I gave the IIT entrance exam this year, the results not out yet but you can calculate your marks as ... A: outside India I think only IIT has any credit, but on the other hand it is only the graduate school ...
which course to chose?	5/4/2009
Q: I gave the IIT entrance exam this year, the results not out yet but you can calculate your marks as ... A: I will answer you properly after work, but I can already tell you that going to a better school is ...
Theoretical physics, is it right for me?	5/4/2009
Q: I have been researching a lot about theoretical physics and I have a very strong interest in it. I ... A: robotics and AI will not be replaced by quantum computation, they may merely be changed by it. We ...
Career in Physics	5/3/2009
Q: I have always thought of being a physicist but I don't have enough information about it, so i hope ... A: I will have to answer in several stages, because that is a whole lot of questions you have asked. I ...
Theoretical physics, is it right for me?	5/1/2009
Q: I have been researching a lot about theoretical physics and I have a very strong interest in it. I ... A: congrats to your A levels and engineering admission, Cambridge is definitely a good school for ...
Magnetism	4/30/2009
Q: Why do astronauts keep to altitudes beneath the Van Allen radiation belts when doing space walks? A: this is undoubtedly to be protected from the charged particles that form the solar wind. The van ...
Physics: Vector Algebra	4/28/2009
Q: I'm in high school where they're teaching vector algebra !! Although i've grasped the basics but i ... A: Your question has two parts, which can be summarized thus: 1) how to solve this particular problem, ...
distance-time equation	4/26/2009
Q: i working in a construction company.. building metro.. my boss give me a timetable diagram.. cant ... A: I will need you to tell me a bit more about the background of your problem, because I am a physicist ...
hey	4/24/2009
Q: i had a few questions in physics in general this time. 1.) they say that the tides on the earth are ... A: the followup and the new question are very much related as they both concern Newton's 3rd Law of ...
hey	4/22/2009
Q: i had a few questions in physics in general this time. 1.) they say that the tides on the earth are ... A: nice to have you back. 1) Tides on Earth are due to the gravitational pull of the Moon (not Earth) ...
Masters in experimental physics	4/21/2009
Q: SIR, I have done bachelor degree of science and now i want to do masters in experimental ... A: there is no major called "experimental physics", if that is your question. You need to find a major ...
Masters in experimental physics	4/21/2009
Q: SIR, I have done bachelor degree of science and now i want to do masters in experimental ... A: the information about institutes all over the world is all over the internet and nobody can possibly ...
help in subjects	4/6/2009
Q: I am 15 years and am currently studying in high school with maths and physics as my main subjects. I ... A: highest salaries come with functions in industry high up the management chain. For that I think you ...
Regarding admission into PhD	3/24/2009
Q: I am 26, and live in New Delhi, India. I have a Bachelor degree (4 years) in Computer Science. I ... A: I appreciate your writing a little explanatory part about your background and motivations. You ...
work	3/19/2009
Q: why when we calculated the work we multiplied force * distance not F/D i.e division what is the ... A: it's because it nature works in such a way that if you lift something up above your head, you must ...
Which circuit will have a brighter lamp?	3/12/2009
Q: Which governs the brightness of the lamp? Power? Voltage across it? Current passing through it? ... A: the brightness is primarily governed by power. When you have a constant voltage source the ...
sphere	3/7/2009
Q: Here, by the factor of pressure http://en.wikipedia.org/wiki/Kinetic_theory is cuboidal container. ... A: if I understand the question correctly, you mean to ask :"What would the result of the calculation ...
daynamic electricity	3/2/2009
Q: Why did we chosen the direction of the current is in the direction of motion of the +ve charges ... A: this is because the choice (convention) was made before people knew about electrons in solids. In ...
Career	2/23/2009
Q: I passed my 11th grade with 98 in Chemistry, 96 in Physics and 97 in Maths. Can you please suggest ... A: with your results you may see great future in any exact science or engineering. That is as much as ...
Physics career and degree	2/17/2009
Q: Hey, I was just wondering, if you want to do research as a theoretical physicist, would it be better ... A: what you heard is very much correct. In order to do theoretical physics research for living you need ...
Why does the frequency of light not increase when its speed increases?	2/13/2009
Q: What happens to light as it passes from glass into air? I understand its speed increases, and that ... A: when we think of light, we can describe it as an electromagnetic wave or as a flux of particles - ...
Careers	2/13/2009
Q: I am a 39 year old sophmore about to transfer from a junior college to a university. I want to major ... A: I am a physicist, but will try to help you. Generally engineering degrees have a larger job market ...
incandescent vs fluorescent bulbs	2/13/2009
Q: I applied 120 Vrms to a 60 W incandescent bulb. As expected, my measured current thru the bulb was ... A: the absorbed power is indeed always given by Vrms*Arms. The mystery here lies in the power rating of ...
Mathematics / Physics careers	2/11/2009
Q: I'm currently 16 and am two years from completing my country's national exam, the Leaving ... A: there are a few careers to chose from, based on your inclinations as you described them. Scientific ...
slope	2/3/2009
Q: I have the a question. Its not academic, but not so easy, and not a homework. I'm studying in a ... A: Certainly, Alma, the equation in polar coordinates in Wikipedia is given in terms of r (or rather ...
opting for NASA	12/13/2008
Q: My name is DHRUV SEHGAL.I want to join NASA,but my school does not provide facility for ... A: you are not the first, nor will you be the last asking me this question. The most important thing ...
scalar and vector	12/3/2008
Q: what is vector divided by scalar?is pressure scalar? is stress scalar A: A vector divided by a scalar is a vector. Pressure and stress are generally rank-two TENSORS and as ...
theoretical physics career	11/22/2008
Q: I m an engineer , unfortuntly after taking my bachelor degree I found that I unsatisfied with ... A: it is hard to give the best answer, because the best course depends on where you live, what job ...
I NEED HELP	11/21/2008
Q: a 1.5 block sliding on a rough horizontal surface is attached to One end of a horizontal spring ... A: this looks like a test or homework question, but for once I can answer it. It will be in symbolic ...
career in theoretical physics	11/11/2008
Q: maybe you remember me. i asked a few questions related to careers in theoretical physics. well, ... A: physicists of all sorts are employed by universities, or national (governmental) laboratories and ...
career in theoretical physics	11/11/2008
Q: maybe you remember me. i asked a few questions related to careers in theoretical physics. well, ... A: yes, I remember. I think your question will be of interest to more people (my own students for ...
INQUIRY	10/27/2008
Q: whats the science branch enable me design products like ( finger nail electric cutter , head phones ... A: design of products does not belong to the scientific careers, it belongs to the engineering. A ...
Momentum	10/24/2008
Q: Hey Mr. Mazur, I have been trying this question over and over, finally I give up..if you would ... A: the key to the solution lies in the fact that there is no friction with the ground and, therefore, ...
sequential inflation	10/21/2008
Q: I am 31 and have a undergraduate degree. How can i vary the length and width of a rubber or plastic ... A: I cannot give you the exact solution, it is more a task for a civil engineer. What you need is to ...
xj	10/19/2008
Q: when I was study engineer I was too proficient in math,physics,mechanics sciences also design ... A: your liking in search for truth, deeper meanings, solutions and results is certainly essential for ...
physics	10/19/2008
Q: A ball of mass 0.120 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to ... A: h1=1.25m, h2=0.600m ('h' stands for 'height'), g=9.81m/s^2, m=0.600kg You never said, where the ball ...
physics	10/19/2008
Q: A ball of mass 0.120 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to ... A: the impulse given must be equal to the sum of impulse to stop the ball (mv_drop) and the impulse ...
Physics	10/13/2008
Q: Why does the air stay in a glass when placed upside down into a bucket of water? - Why does a piece ... A: you have not indicated your age, so I don't know at what level I should give the answer. I will use ...
Being a Physicist	10/10/2008
Q: What does it take to be a physicist? I have actually been tremendously intrested in Physics and ... A: at your age I just about got the idea that physics is an interesting thing. If you are so genuinely ...
Electric Field and Applications	10/7/2008
Q: What is the importance/relevance to know the electric field distribution of a electrical apparatus? ... A: this depends on the strength of the field and the sensitivity of the elements inserted in the field. ...
springs	10/2/2008
Q: If a 2kg block is moving on a frictionless surface at 7m/s and collides with a spring with force ... A: There are more answers possible (different in the level of detail and methods used) depending on ...
Reverse osmosis	9/23/2008
Q: What is the technical difference between a "Reverse Osmosis (domestic) unit" and a "Water filter ... A: this is not exactly my area of expertise, but I understand that a "water filter unit" is a more ...
career in theoretical physics	9/19/2008
Q: Well another thing i came across recently was a course at the IIT's. It's called applied physics and ... A: sure, as I already wrote, at my US school it was one exam for both, the MAsters and the PhD ...
career in theoretical physics	9/19/2008
Q: Well another thing i came across recently was a course at the IIT's. It's called applied physics and ... A: yes, such course is definitely a good option. It is at a school of a good name and it does not take ...
career in theoretical physics	9/17/2008
Q: I talked to you about the career options in theoretical physics a few days back. Now I've just ... A: what is a worthwhile career and what isn't is individual, so that what works for one needn't work ...
Orientation and Advice	9/15/2008
Q: I'm a high school student and I have always had a great interest for maths and, especially, physics. ... A: What a good point to start is and what would be a good book, that depends very much on how much you ...
career in theoretical physics	9/13/2008
Q: I talked to you about the career options in theoretical physics a few days back. Now I've just ... A: as far as I know, the QE is mandatory in the USA for all attempting a Masters or PhD in physics (and ...
physics career	9/10/2008
Q: I am a guy(19 years)from India doing electronics & communication engineering. i am curious about ... A: I apologize for the delay. All the topics you named are related to electronics and yes, you can ...
electrical engineering/physics career question	9/9/2008
Q: Mr. Mazur, Hello. My name is Sam, I’m 14 years old, and am in my sophomore year at a community ... A: allow me to give you a brief answer now and follow up later, if you ask. If your intention is to ...
career in theoretical physics	9/8/2008
Q: I talked to you about the career options in theoretical physics a few days back. Now I've just ... A: I understand your question, now what to do... One school has a prestige, but doesn't offer the ...
careers in theoretoical physics	8/28/2008
Q: i know , i've askedo too many questions now!! but now the last and final one. I got all your points ... A: I know it is frustrating, but these are the facts. Engineers are easily paid double and more, ...
career in theoretical physics	8/25/2008
Q: I'm a guy from India and am presently in the last year of my high school. I want to be a theoretical ... A: and sorry for the delay in my answer. Theoretical physics and astrophysics are terms corresponding ...
career in theoretical physics	8/24/2008
Q: I'm a guy from India and am presently in the last year of my high school. I want to be a theoretical ... A: let me tell you, how it went with me. In my undergraduate years (4) and Masters years (2) I earned ...
career in theoretical physics	8/24/2008
Q: I'm a guy from India and am presently in the last year of my high school. I want to be a theoretical ... A: I am happy to help. The scholarships vary in their scope and generosity. some indeed only cover part ...
career in theoretical physics	8/23/2008
Q: I'm a guy from India and am presently in the last year of my high school. I want to be a theoretical ... A: threr are two parts to your question. One, the income during studies, and second after earning a ...
newtons 3rd law	7/24/2008
Q: Why when you would hit a soft object will newtons 3rd law not apply and an equal and opposite force ... A: Newtons' 3rd law makes no difference between soft and hard objects. A difference occurs in the ...
physics	7/21/2008
Q: When a hydronium ion concentration equals 1 x 10 13 mol/L, what is the pH of the solution? A: I think you meant 1e-13 mol/L. That's because the molarities are always fractions of mol per ...
metal expansion	7/19/2008
Q: This is probably a simple question. If you secure a 1" 1 mile long rail so it can't move at ... A: this physical question requires (under the simplest assumptions) only application of geometry. Let ...
physics grade 11	7/8/2008
Q: em yea i took grade 11 physics to fast track for next year but my teacher doesn't explain or teach ... A: Greetings, Mat, your question is exactly what we are here for:-). Let's get down to business right ...
career choice	6/1/2008
Q: i just gave my o level exam with 10 subjects.now for further studies i have chosen physics ,maths ... A: seeing you are primarily interested in maths, I would suggest computer science as a good complement ...
heat expansion	4/16/2008
Q: why does metal expand when heated. my projet is to heat a knitting needle with a candle. Why does ... A: yes, metals expand, when heated. You wrote nothing about your age or level, and that is important, ...
mechatronics	3/26/2008
Q: i just finished my high school. Im very much interested in doing mechatronics engineering. Could u ... A: please note that mechatronics is rather far away from physics career, to which I am an assigned ...
careers in experimental physics in India	3/26/2008
Q: I am in the tenth standard (Indian CBSE board). Iam planning to take up science as my stream. I want ... A: in order to be a scientist-researcher by trade one has to have at least a Master's degree, but ...
Ice Crystals	3/24/2008
Q: This is mywhy is in the middle of ice, white ? (have you noticed ?) I guess the reason must be ... A: ideal ice crystals are transparent like glass. The white, "misty" character is present in many real ...
Mechatronics career	3/14/2008
Q: Greetings sir. Im a high school senior doing my final year in South Africa and wish to pursue a ... A: yes, indeed I misunderstood. :-) I am not at all familiar with male and female names in your part of ...
physics	2/28/2008
Q: why we use negative sign in electric potential energy? A: Jani, only electrostatic energy between charges of OPPOSITE SIGNS has negative sign, and that is ...
What should I major in?	2/23/2008
Q: I am interested in quantum mechanics and theoretical physic. I'm not exactly sure what I want to ... A: you ask for a mere miracle... Feynmann predicted the eventual rise of nanotechnology 50 years in ...
blocking of magnetic field	2/18/2008
Q: i want to use a plate of any material in blocking magnetic fields line.Means,is there a plate exist ... A: the only way to do that is to use another magnet with opposite field, so that at the desired place ...
Interesting Physics Topic	2/17/2008
Q: I need to give a 10 minute oral presentation on an interesting topic in physics. I've only begun my ... A: spintronics (or spin-based electronics) is a concept which uses spin of atoms and electrons to ...
What exactly are "flames"?	2/16/2008
Q: What exactly are "flames"? From what I've read about, it's where atoms are rearranging, with a net ... A: Green, Flames only accompany highly exothermic chemical reactions such as burning, which is in ...
blocking of magnetic field	2/14/2008
Q: i want to use a plate of any material in blocking magnetic fields line.Means,is there a plate exist ... A: there is no way of blocking a static magnetic field the way you imagine it. It is because magnetic ...
careers/purely magnetic motors	1/28/2008
Q: Mazur, I am very interested in theoretical physics- especially the science and study behind ... A: the career that seems to fit your inclinations is Theoretical Astrophysics. As my field is ...
science fair	1/2/2008
Q: I am doing a science fair project on cell phones. My research question is, "Does cell phone ... A: I have nothing but very general advice. Your project sounds challenging, because to correctly work ...
physics	12/18/2007
Q: The expert can't answer your question. Your Question was: What is your level of education? What ... A: you sound very harsh in asking questions. But here you are: 1)RNDr.(country specific step up beyond ...
Physics HELP	12/7/2007
Q: Any help on any of them would be greatly appreciated. I understand if you don't work the problems ... A: I think I can help you with most of it. 1) Yukawa potential produces force F=-grad(U)=-dU/dr ...
400 nm laser pumped by aneutronic fusion -- possible?	11/28/2007
Q: Is it physically-possible to design and build a 400 nm laser that is directly-"pumped" by aneutronic ... A: I cannot say it is impossible, but: * the H+B fusion and all aneutronic fusion reactions are still ...
Questions about magnetic analogs of electricity.	11/24/2007
Q: Dielectric strength and ohm [electric resistance] are electric entities. What are their magnetic ... A: according to Wikipedia: Dielectric strength of an insulating material = the maximum electric field ...
electricity	11/24/2007
Q: if a point charge is released in a non uniform electric field with field lines in the same ... A: The problem is stated in a bit confusing way, but I think we can clear ti up. I think the problem ...
electricity	11/23/2007
Q: if a point charge is released in a non uniform electric field with field lines in the same ... A: I will take this definition: "rectilinear = Distance, paths, lines, etc. which are always parallel ...
Why are magnetic field lines always depicted as pointing from north to south?	11/18/2007
Q: Southern magnetic energy is emitted from the side of a magnet taking in the lines of force. Northern ... A: O.K. I misunderstood you then, I apologize. The arrows on the field lines are a matter of convention ...
Why are magnetic field lines always depicted as pointing from north to south?	11/18/2007
Q: Southern magnetic energy is emitted from the side of a magnet taking in the lines of force. Northern ... A: Green, there are two parts to your question as I perceive it: 1) "why are the magnetic lines always ...
coefficient of friction	11/13/2007
Q: I am having trouble understanding this. For example: The coefficient of sliding friction for steel ... A: I am sorry for the delay in my answer, I took a short vacation :-). You start with Newton's laws ...
evaporation of water	10/20/2007
Q: I'm a bt older. I have never been to uni nor 12th year but my twin daughters, who we home schooled ... A: I have been thinking about your task for a couple of days, for I only have some general advice on ...
measuring evaporation from a wall	10/2/2007
Q: Hey, I'm an undergrad and designing an evaporimeter to measure the rate of evaporation from a wall. ... A: I am glad I could help. Let me try to show without a picture, what I meant by the plastic disc... ...
measuring evaporation from a wall	10/1/2007
Q: Hey, I'm an undergrad and designing an evaporimeter to measure the rate of evaporation from a wall. ... A: It's not my field but it seems to me that an adjusted Piche's evaporimeter ought to work. You get ...
Physics: Light	9/28/2007
Q: I just have a couple of question that I need double checking on and my mom or dad does not ... A: I'll be glad to help. 1. violet (ultra-violet is just beyond the visible spectrum) 2. they have ...
careers in physics	9/23/2007
Q: I enjoy studying physics. I was wondering if its possible to specialize in mechanical physics,and if ... A: mechanics itself seems to be quite complete nowadays. It is taught in the first semester ...
time & space	8/22/2007
Q: does time move relative to space? A: this is a natural question and has a simple answer. But we should clarify our terminology before ...
What a scientist does.	8/19/2007
Q: I'm have some interest in astrophysics and astronomy, but I just don't know what a scientist does? A: I apologize for a late answer. Now, what does a scientist do...? Many things, all working together ...
Theoretical physics	7/25/2007
Q: Considering one has high interest in a field of theoretical physics, can success be attainable even ... A: in my knowledge, wormholes are included in theoretical astrophysics as an odd, yet possible ...
Magnets & Integrated Circuits	7/12/2007
Q: Is it possible for a magnet to destroy an Integrated Circuit (IC) chip? If yes, how large would the ... A: in principle, a magnet (static field) could make a chip not work, if that chip contained magnetic ...
current	6/22/2007
Q: 1.Is Electric current a scalar or vector? Please explain. 2. Mention some of the quantities which ... A: 1. Quite generally, electric current is a vector, although in some problems we can work with it as ...
Speed & Distance	6/5/2007
Q: We have read in physics, Speed = Distance / Time. So Speed is directly proportional to Distance. So ... A: It is true that Speed is defined as "Distance traveled" divided by "Time of travel". Let me assign ...
high school student	5/30/2007
Q: I am a high school student (junior, senior in two weeks) at a somewhat prestigious private school in ... A: last December I graduated Illinois Tech, so I may my able to answer even on the college subject. ...
coefficient of friction for snow	5/29/2007
Q: I have this project in which I need to know the coeffiecient of friction for snow with various ... A: Tabraiz, I do not know them and I imagine it would be quite a tricky quantity to measure. I found ...
careers:nuclear phyics	5/10/2007
Q: I'm in 12th standard(INDIAN EDUCATION).I have a long cherished dream to become a nuclear ... A: I am pleased to hear about your enthusiasm for science. I can tell you that of course there is a lot ...
water evaporation	5/9/2007
Q: I am doing a science project on the effects of color on evaporation. I have food coloring in 3 cups ... A: I would definitely suggest repeating the experiment - reproducibility is a mandatory feat of any ...
water evaporation	5/9/2007
Q: I am doing a science project on the effects of color on evaporation. I have food coloring in 3 cups ... A: I need to ask you a few questions first about your experiment to give you a sensible answer. All ...
hazardous equipment	3/26/2007
Q: is it true that people who live near power lines or excessively use electrical equipment (such as ... A: I am not a real expert in this, the only people, who can really answer this, are scientists (if ...
career paths	2/23/2007
Q: I am a senior in high school and I've always been interested in physics, especially on the ... A: I apologize for not getting to your question sooner. It is great to hear about your interest in ...
best career related to physics	2/9/2007
Q: my name is salem and am 16 gd. lev. 11. i will be pleased to take your valuble time to ask you what ... A: I will try to give you fair answers. As you probably have expected, the "best" career is different ...
Physics	12/6/2006
Q: But Potential difference is produced due to emf?Please explain more.I will be thankful to you.What ... A: as you posted a followup, may I ask you to tell me, what led you to lowering my rating? I really ...
Light	12/4/2006
Q: Hey i would like you to check my answers to these questions and correct those that are wrong. I ... A: You effectively asked for explanation of 25 different things and I cannot do that, I will give it ...
Physics	12/3/2006
Q: What is difference between EMF and POTENTIAL DIFFERENCE? A: The EMF is a "type" of potential difference. Potential difference is the basic expression, whether ...
i really need help..its killing me...	11/28/2006
Q: thanx for the reply i gain my breath again..anyway, the sorter will separate those coins into its ... A: Okay, I understand you want to design a flow chart for a machine, which is a sorter and a ...
Loves physics, math... not so much	11/14/2006
Q: For years I have been heavily interested in physics. The problem is, I do not understand the way my ... A: it's pleasing to hear of your interest in Physics. However, I feel that what you are asking for is ...
formulas	11/9/2006
Q: Physics is, from what I can tell about it from my 11th grade high school course, more than simply ... A: Shawn, you are perfectly right in saying that physics is about understanding. I also agree that a ...
is physics the major for me?	11/3/2006
Q: i attend northern kentucky university- its a large school and really seems like it should offer more ... A: As you have a mixed major/minor, I hope I get it right that you are taking all the required courses ...
is physics the major for me?	11/2/2006
Q: i am currently a physics major/ neuroscience minor, but i really, really want to be a biomedical ... A: where is it that you go to college? It's unlucky you find yourself studying a program other than one ...
college physics	9/25/2006
Q: I'm a senior in college taking college physics. I gotta say, its hard. I thought organic chemistry ... A: 1)when they ask about impulse transfer, you calculate it as the total change in momentum. From what ...
heat	9/20/2006
Q: Could you answer these questions? I am doing an experiment about heat. Name of scientist: ... A: Wow, your questions make me wish my local car retailer comes up with a deal "buy one, get sixteen ...
career in physics with electronis	9/5/2006
Q: I am very pleased that you want to know much about my qualification, this shows that i can realy get ... A: I apologize for delaying my answer. A lot has been going on in my work for past week... I have a ...
Physics as a major	9/5/2006
Q: Mazur, Im a senior in a high school. I'm thinking about Physics as a major, what careers can i get ... A: I apologize for the delay in my answer. The careers choice with physics degree indeed varies with ...
resistance	9/4/2006
Q: sir, post office box is used to measure the resistance of metal as we know. can you please say that ... A: I would not have chosen "it's out of my expertise", my opinion would have been "this is a ...
career in physics with electronis	9/3/2006
Q: Iam 31years old, i have higher national diploma in physics with electronis in one of the polytechnis ... A: as I am located in USA, I know little about UK colleges. Just recently I heard the Nottingham ...
Hey	8/28/2006
Q: Hey Daniel, You always serve my queries better than I expect, thanks a lot again. Well, my course ... A: once you know about matrices and vectors, you can start using Matlab efficiently (I cannot speak for ...
Hey	8/27/2006
Q: Hey Daniel, not sure if you remember me or not. i asked you long back about the programming side of ... A: Bob, I am glad you valued my avice before and I am ready to answer these new question. ...
Diffraction in a fiberoptic cable??	8/9/2006
Q: I am a new grad student in biomedical engineering. The subject of diffraction interests me beyond ... A: your question is beyond my curriculum and knowledge, I am afraid. Let me just answer what I know. I ...
career in physics	7/28/2006
Q: I'm not sure yet of course but I am thinking about a career in NASA or ESA. Do you know how easy it ... A: having never worked for either of the Space Agencies, I don't know, how easy or difficult to work ...
Magnetism	7/15/2006
Q: haha, i'm a college student, exploring various objects at the time but i guess i should have phrased ... A: Aye, I get it now. Well, the second paragraph of my first response applies here. You'd do best to ...
Magnetism	7/14/2006
Q: I was wondering how one would store neodymium magnets. Would you need a magnet shield or something ... A: I a not sure which property of Nd magnets concerns you. If it is just a worry that if it ever ...
Physics Special or Physics Math?	7/7/2006
Q: I'm 18 and I'm going to my second year in the Faculty of Sciences (it is 4 years) and I love Physics ... A: Well, I understand your dilema. Do you have any idea about, what you would like to do, after you ...
Please answer my questions	7/4/2006
Q: We are a group of physics teachers following a professional Course. We,d be glad if you answer our ... A: 1) I am sure you meant electromagnetic waves. The effect is called 'skin effect', saying that ...
Information required please hala1juned@yahoo.com	7/3/2006
Q: We are a group of physics and chemistry teachers following a professional development course . We ... A: I am not an expert on electromagnetic waves/light, nor black holes. I will answer the questions 1 ...
Refraction of Light	6/28/2006
Q: Age:17 Education : 12th grade studying When a ray of light travels from a denser medium to a rarer ... A: I believe the answer is 'Sometimes yes, sometimes no', you have to keep in mind that you are working ...
magnet	6/23/2006
Q: is there any thin like nine-pole magnet ? How does multiple pole magnet exits? A: multipole magnets are just arrangements of normal two-pole magnets made to produce a defined field ...
Career : Physics with Electronics	6/20/2006
Q: i would like to know what career i can get by studying Physics with Electronics. Currently, i'm ... A: I apologize I took time before answering this question of yours. Studying physics with electronics ...
What degree is needed to be a physicist	6/2/2006
Q: Say if you want to be a professional scientist; a theoretical physicist who studies black holes, and ... A: I forgot... the PhD study plus one or two post-doctorate appointments (2-4 years a piece) are ...
half life	5/2/2006
Q: a radioactive source has a half-life. how long does it take this source to decay to one tenth and ... A: the expression is N(t)/N(0) = exp(-t/{mean-life}) = 2^(-t/{half-life}) The left-hand side has the ...
force & motion	3/29/2006
Q: Q.#.01:Find the force required to give a block weighting 12lbs,an acceleration 8ft/sec^2. Q.#.02:A ... A: This sounds too much like a homework. Therefore, I'll be short. A#1. F = m.a = 96 lb.ft/sec^2 (I ...
high school physics-momentum	3/22/2006
Q: i know algebra and this is double honors physics.i dont need atmosperic influences.ive done the ... A: here are some answers and some notes: 1) time t from height h0 to ground: t = Sqrt[2h0/g] ...
high school physics-momentum	3/21/2006
Q: i made a container out of sponge that weighs 52 grams. This container was built to save an egg that ... A: I need you to tell me more about your task to give you the correct answers. 1) What level of physics ...
Special Relativity	3/9/2006
Q: This question has come up in a discussion and we would like someone well versed in Special ... A: honestly, my skills in special realtivity are rather basic and I am in a hurry with my own deadlines ...
If I want to Join NASA than what i have to do?	3/8/2006
Q: My name is Faraz Nizamani.. And I want to ask that if I want to Join Nasa than what I have to do ... A: the best thing you can do is to visit NASA's home page (through www.nasa.gov) and click "Work for ...
help	3/4/2006
Q: Hey, I have talked to you before. I need you to answer a few questions for me if you can. 1.Where do ... A: 1.Where do you work. Argonne National Laboratory, Illinois, U.S.A. 2.If not a scientist in physics, ...
Ionic Propulsion	2/16/2006
Q: I am 22 and doing a research paper on my views of ionic propulsion. I would appreciate any ... A: I am no expert in ionic propulsion, I am afraid. In an off-hand search of the internet I found ...
Relation of Gravity and Energy	2/2/2006
Q: I am 43 and when it comes to fill in some official forms about my education, I have to fill in None, ... A: the quantity we call "force" is not measured in "joules", but in "newtons". "Joule" is a unit of ...
Science Fair Project	1/30/2006
Q: It's me Sana, again. I've decided to do "How does cell phone radiation affect memory?" So far, I've ... A: I apologize for taking longer time. The AllExperts.com had problems when I tried to post my reply ...
Help On Science Project	1/28/2006
Q: My name is Tommy and i need help on my science project. I was wondering if you would be able to ... A: I can advise you, of course, provided I know something about the project topic. I will need specific ...
Science Fair Project	1/28/2006
Q: I'm in the 7th grade and I'm doing a science fair project. My topic is "How does cell phone ... A: the effect of cell phones on brain is a complex topic and even in the grown-up scientific community ...
projectiles thrown horizontally	12/17/2005
Q: I hope I'm finding you in the best of health. I am 16 years old and in high school By projectiles, ... A: I will gladly answer you. The confusion you feel arises from the textbook tendecy to give you ...
types of force	12/17/2005
Q: hy how many types of force exists ? is there 5th type of force exists ? help me thank you. by A: in science we recognize four basic types of forces: strong, weak, electromagnetic and gravitational. ...
interview	12/14/2005
Q: I will like to know if I can interview you for a school project. The project is on time travel and I ... A: Yes, you can ask anything and I will try to be helpful. Best if you just go ahead and post your ...
coefficient of friction formulas	11/26/2005
Q: I hope I'm finding you in the best of health. I'm in 11th grade and am 16 years old. A 60kg boy is ... A: Your first solution to the first problem is quite correct. Just for the sake of thorough ...
physics	11/25/2005
Q: how we convert AC to DC? A: to convert AC to DC you will need a couple of rectifying diodes in a Graetz bridge, which will ...
Modulus principle	11/22/2005
Q: What structural factors influence on young modulus of a material network? (Please refer me to some ... A: I apologize for the delay, the email notification of your post didn't find me. Factors influencing ...
Atomic weight & Atomic number	11/17/2005
Q: i'm israr ahmed. i'm a student of 11th standard in pre-medical. My question s that why the atomic is ... A: 'A' stands for Atom, Atomic. Moreover, this word is very international, it has first been used by ...
Current	11/6/2005
Q: My name is Julianne and i was just wondering if you could help a poor girl out with a headeache ... A: Not that I know the answer from the top of my head, although I could have remembered it - it's one ...
Evolution 'starting again'	10/26/2005
Q: I'm an undergraduate stuck on a personal question, looking for more information in general on this ... A: this is really an unusual question, but I'll try to think about it. I cannont recommend any papers ...
physics: force	10/23/2005
Q: Hi, I am a ninth grader and I am doing a science fair project on force and I was wondering if you ... A: I do not understand to task completely, I do not know, what you meant by "surface of an area". If ...
Physics as a major??	10/21/2005
Q: im a 11th grade student, and im very interested in physics. But i think that getting a BA in physics ... A: This depends very much on your priorities, but if you look at the money in science (both academic ...
I am a biology major and am...	10/18/2005
Q: I am a biology major and am 19 years old. I had trouble with the following problem: A student ... A: The total friction force is a constant given to you (38 N, because it should just compensate the ...
physics: motion	10/18/2005
Q: I am doing a science fair project on motion and I was wondering if you could help me. My purpose for ... A: I do not understand to task completely, I do not know, what you meant by "surface of an area". If ...
Wondering If You Can Help	10/5/2005
Q: Im lost chathy Hello, This year I started home schooling for my last two years of school. And the ... A: This is largely a matter of having the right book in your hands and/or the right teacher by your ...
physics	9/28/2005
Q: A ball is thrown upward from the top of a 26.6 m tall building. The ball's initial speed is 12 m/s. ... A: You can get the time of flight of the ball from launch till it hits the ground as a solution of the ...
physics	9/28/2005
Q: A ball is thrown straight upward and rises to a maximum height of 21 m above its launch point. At ... A: From conservation of energy you can get that the initial velocity v_launch is v_launch = ...
Stress	9/18/2005
Q: I am thinking of doing a science fair project on stress. Do you know how I can measure a person's ... A: there are undoubtedly a few approaches to measuring stress of a living entity. I don't feel an ...
newton's laws of motion	9/18/2005
Q: a man has fallen into a ditch of width d and two of his friends are slowly pulling him out using a ... A: I need to know the level of your physics education to give you an answer that fits you. One thing to ...
water melting	9/6/2005
Q: why water melts faster at mountains? A: Water is liquid, it doesn't melt. If you are asking about ICE melting, your question is too general. ...
Materials Technology	8/19/2005
Q: What is the process for TiN coating on stainless steel watch straps & How the coating adhesion can ... A: the most common process used for TiN coatings in industry is the reactive cathodic arc plasma ...
Mirrors	8/1/2005
Q: How much energy in eV (electron-volts)is emitted by a hydrogen atom if the electron jumps from the ... A: You can find answer to this question at http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html ...
limits?	7/20/2005
Q: To answer your questions: The college I am attending offers an intensive dual-engineering program ... A: I apologize for this delay before I got to answering the seconf post of yours. I have iven your case ...
limits?	7/19/2005
Q: I am 18 years old, and just graduated from a public mainstream highschool. I did very well in ... A: I will be happy to help you. I have never had such a hearing problem, I only have a slight one, ...
Ionic Propulsion	7/16/2005
Q: I am 12 years old, but I know far more than you think I do. I have been researching ionic ... A: Admiral_N, I will not make any assumptions about your current knowledge based on your age, I ...
Rocket Physics	6/1/2005
Q: My sixth grade students wondered how fast the liftoff of the space shuttle has to be to obtain ... A: For a sixth grader a satisfactory answer might be about 8 km/s. That is the same speed the rocket ...
Career in Electronics/Electrical engineering	5/16/2005
Q: I am 16 and considering the possiblilty of going to university when I am 18. I am particularly ... A: Electronics studied from the physics perspective is considerably different from the one you come ...
Ampere's Law.	5/13/2005
Q: I have study physics for some years now. Just a few days ago I read about Ampere's Law. I am not ... A: In essence Ampere's Law tells us, where magnetic field comes from: it's caused by electrical ...

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