Physics/Questions Answered by Expert Expert
| Subject | Date Asked |
| superconductivity | 2/6/2012 |
| Q: Do you believe superconductivity could be done by changing the current in some way not by changing ... A: > electrons can form cooper pairs at normal temperature You are apparently aware that ... | |
| quantum mechanics | 2/2/2012 |
| Q: You have been very helpful in the past. I wonder if I can bother you with one further question. ... A: I'm pleasantly amazed at your insightful nature. Usually I have to state that your original ... | |
| Wormholes | 1/31/2012 |
| Q: what are warm holes and what is relation of time with warm holes ? A: Wormholes (which I presume was the word you meant) are theoretical objects which would, IF they ... | |
| i guess special relativity | 1/30/2012 |
| Q: Time at high "altitude" in "gravity hole" moves faster in relation to point A at sea level, or lower ... A: > Is this length contraction at high velocity, > then a length expansion in low gravity? Let's ... | |
| i guess special relativity | 1/30/2012 |
| Q: Time at high "altitude" in "gravity hole" moves faster in relation to point A at sea level, or lower ... A: > Time at high "altitude" in "gravity hole" moves faster in relation to point A at sea level, > or ... | |
| Mass energy | 1/28/2012 |
| Q: Where does the idea come from that energy is "within" mass, when Einstein's equation plainly ... A: > Einstein's equation plainly declares that > energy is mass that is "moving" ! (Mass x Velocity ... | |
| matter dying and changing form | 1/21/2012 |
| Q: I apologize because I have very little knowledge of science. This is a very important question to ... A: First of all, my condolences on your deeply painful loss. I could never imagine what you are ... | |
| General Relativity | 1/20/2012 |
| Q: Usually, when I read about general relativity, I found remark that the theory explained what causes ... A: > But it seems to me ... that general relativity only shifted the> Am I missing something? You're ... | |
| Time in and near a black hole | 1/18/2012 |
| Q: why time is slow near black hole and zero inside it? ANSWER: Einstein derived the fact that a clock ... A: The effect is called "gravitational time dilation," and it is a consequence of general relativity. ... | |
| Our Earth as a magnet | 1/17/2012 |
| Q: we say that magnet does not work in high temperature,on the other side we say that earth act as a ... A: There are two ways to create a magnetic field, but only one is susceptible to heat. In a permanent ... | |
| Time in and near a black hole | 1/16/2012 |
| Q: why time is slow near black hole and zero inside it? A: Einstein derived the fact that a clock within a gravitational field will run more slowly than an ... | |
| Physics terminology | 1/15/2012 |
| Q: what is difference b/w magneto and ac generator and difference b/w e m f and pd A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Physics : Electricity | 1/14/2012 |
| Q: I was told by some expert that stones are poor conductors of electricity. If so, why are we getting ... A: The 'zap' you feel when your body comes into contact with a voltage -- whether from a build up of ... | |
| testable predictions | 1/11/2012 |
| Q: Physicists generally want theories they can test. In reviewing the stuff of "physics 101" I got the ... A: The "mistake" that Physics2012 refers to are crude experiments done over 250 years ago. While Emilie ... | |
| Reusing energy for electricity | 1/9/2012 |
| Q: I was wondering if thin solar cells had been created and if infrared cells had been invented which ... A: > I was wondering if thin solar cells had been created Depending what you mean by "thin." Usable ... | |
| relativity | 1/7/2012 |
| Q: Sorry to bother you again. I seem fixated on this issue. This is short. Does every single object ... A: In every instance where one object is moving with respect to a frame (and that frame can be our ... | |
| Explosive uncertainty? | 12/31/2011 |
| Q: Just for fun, I wrote a program in visual basic to simulate the motion of an array of 100 particles ... A: I'm going to conclude that you are asking about the (theoretical) large amounts energy one might see ... | |
| Limit of electrons in the universe | 12/31/2011 |
| Q: If the speed of light (C) is a speed limit for electrons and Planck's constant (h) determines the ... A: > Planck's constant (h) determines the minimum size of any steps > between energy levels an ... | |
| Are humans magnetic? | 12/31/2011 |
| Q: Are humans magnetic? A: Fortunately, no. If our bodies generated a magnetic field even one-tenth the strength of our ... | |
| microwave optics | 12/28/2011 |
| Q: People may not have money to repair microwave ovens. Wax and paraffin focus microwaves well so that ... A: I'm not sure what you mean by "stray microwaves," but there's not a lot of them going around. If ... | |
| Lightning | 12/26/2011 |
| Q: I was wondering if it might ever become possible to generate lightning artificially(ie originating ... A: > might ever become possible to generate lightning artificially MIGHT it EVER become POSSIBLE? (say ... | |
| Pollination via sound waves | 12/24/2011 |
| Q: To whoever can answer my question; I would like to make a small lucerne plant vibrate using sound ... A: There are two steps necessary for proper pollination of any flowering plant: (1) pollen from the ... | |
| decay of particle physics | 12/21/2011 |
| Q: " A particle cannot spontaneously decay into particles heavier than itself is actually a consequence ... A: "Spontaneous" decay means a decay occurring by the particle by itself -- no other particle involved. ... | |
| Buoyancy | 12/20/2011 |
| Q: My question is, how the bottom of a submerged object experiences more upward force compared to its ... A: NOTE: I'm emphasizing certain prepositions because, over the decades, I have found that people get ... | |
| Buoyancy | 12/19/2011 |
| Q: My question is, how the bottom of a submerged object experiences more upward force compared to its ... A: Let's rephrase your example EVER so slightly. Let's say, instead of examining a cork with one ... | |
| Buoyancy | 12/18/2011 |
| Q: My question is, how the bottom of a submerged object experiences more upward force compared to its ... A: A short intro to the buoyant force. Every object at or near the surface of our planet experiences ... | |
| condensation on car windows | 12/12/2011 |
| Q: Not sure if this is a physics question but I have observed 2 contrasting things happening recently & ... A: You are correct. Condensation occurs much more readily on dirt particles. Indeed, without such dust ... | |
| condensation on car windows | 12/11/2011 |
| Q: Not sure if this is a physics question but I have observed 2 contrasting things happening recently & ... A: I can only pass on some simple facts about what causes condensation on windows (or on any other ... | |
| Relativity | 12/9/2011 |
| Q: Sorry to bother you with this probably silly question. Thank you for your patience. I was just ... A: > Sorry to bother you I do this out of love for the spread of scientific understanding -- no ... | |
| relativity | 12/8/2011 |
| Q: This may be a very very dumb question. I am taking the liberty of asking it and than you for your ... A: Joan! Hope you don't mind me trying to answer this question as well. > Does this mean that time ... | |
| Sound intensity | 12/6/2011 |
| Q: sir in what factor does the intensity of sound depends ? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| EM Radiation, | 12/6/2011 |
| Q: Welcome back , I hope you had a good vacation. EM radiation "reacts" with different material ... A: > but the casing is made of metal? The beaming of microwaves into the oven chamber results in a ... | |
| EM Radiation, | 12/5/2011 |
| Q: Welcome back , I hope you had a good vacation. EM radiation "reacts" with different material ... A: > I hope you had a good vacation. I did, thank you. > What determines this difference? The main ... | |
| Definition of "light" | 12/4/2011 |
| Q: Is the term "light" used to refer to the entire electromagnetic spectrum or does this term only ... A: IN GENERAL, the use of the word "light" in physics means that part of the EM spectrum that is ... | |
| Change in the gravitational constant | 12/3/2011 |
| Q: sir by any mean can the value of universal gravitational consantant change "G"? A: The answer is simple: no. In our present understanding of our Universe, no measurable change in the ... | |
| motion of motorcyclist in death well | 12/2/2011 |
| Q: Sir I am confused that why in death well(a person motorcycling on slightly curved vertical walls)the ... A: > But friction is always directed opposite to the motion Not quite. There are two types of ... | |
| Radiation | 11/28/2011 |
| Q: is it possible to get cancer from other peoples radiation that their body emits? A: According to http://nextbigfuture.com/2011/03/radiation-chart.html a person would need to receive ... | |
| RELATIVITY | 11/28/2011 |
| Q: Apte, This is a very simple minded question and I know I am taking liberties to ask it. Thank you ... A: Although I am not Mr Apte, it appears nobody else has volunteered to answer this question over the ... | |
| Dark Matter and Dark Energy | 11/22/2011 |
| Q: I heard that dark matter was a result of seeing all the gazillion kgs of mass in the universe and ... A: You seem to be confusing two facts about our Universe, which have nothing to do with each other ... | |
| Contact between materials of different densities | 11/9/2011 |
| Q: What happens when very different densities come into contact with each other? Looking for ... A: "What happens" depends greatly on which materials of different densities come into contact with ... | |
| polarization | 11/8/2011 |
| Q: the animated diagrams were a big help.Can I assume that unpolarized light is the only source of EM ... A: > What makes some radiation polarized and others partially polarized? For the most part, the ... | |
| Infinite speed of light | 11/7/2011 |
| Q: sir my question is thatif the speed of light were infinite,what would the equation of special ... A: The two equations of special relativity involve a ratio of the velocity 'v' of the observer ... | |
| polarization | 11/6/2011 |
| Q: the animated diagrams were a big help.Can I assume that unpolarized light is the only source of EM ... A: > Can I assume that unpolarized light is the only source of EM radiation? No. Light and EM ... | |
| Moon in orbit | 11/1/2011 |
| Q: Why doesn't the moon crash into the earth when the earth is between the moon and the sun ? Two ... A: If it seems to have taken a longer time than normal to get an answer, or if I'm repeating an answer ... | |
| Circularly polarized light | 11/1/2011 |
| Q: I am reading up on light and came across this statement...If light is composed of two plane waves of ... A: This IS a confusing concept. Bear with me as I try to explain it. As you correctly note, ... | |
| Maintaining a standing position | 10/25/2011 |
| Q: now picture this if a man is standing on his feet normally then the weight of his body would be ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Gravity and Extra Dimensions | 10/14/2011 |
| Q: I'm trying to understand theories about extra dimensions of space. How does the end result of a ... A: > if gravitons do exist, is it necessarily the case that they escape to another dimension? No, but ... | |
| Echoes | 10/7/2011 |
| Q: http://en.wikipedia.org/wiki/Echo_%28phenomenon%29 1. why echo only in specific places/areas ? - ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Why the speed of light is special | 10/5/2011 |
| Q: Why can't we restate the nothing can go faster than light , with nothing can go faster than a ... A: > my understanding of light is probably wrong. Not a problem -- the nature of light is VERY ... | |
| Why the speed of light is special | 10/5/2011 |
| Q: Why can't we restate the nothing can go faster than light , with nothing can go faster than a ... A: > Why can't we restate the nothing can go faster than light, > with nothing can go faster than a ... | |
| Freezing water with dissolved solid in it | 9/29/2011 |
| Q: I know salt effects the freezing time of water, but does sugar and baking soda affect it to? If so ... A: The fastest way to find out the effect of sugar and baking soda on the freezing time of water is to ... | |
| Megnetic field and its effect on protons | 9/27/2011 |
| Q: Sir / Madam please tell me which pole of a magnetic field attracts or repels +ve charge. If +ve ... A: I'm not sure I understand the question, but I'll answer what I THINK you're wondering about. In ... | |
| How much can we know about our Universe | 9/11/2011 |
| Q: Good day It has been said that most of the universe is dark matter and unseen and that the visible ... A: When scientists speak of "the Universe," they usually mean "that part of the Universe that we can ... | |
| Force equals mass times acceleration | 9/9/2011 |
| Q: circular motion = acceleration ? A piece of mass falling is defined by (mass x acceleration). Is a ... A: The acceleration of the center of mass of the disk is, indeed, equal to the sum of all external ... | |
| Ball spinning down a tube | 9/4/2011 |
| Q: I'm over 40, this is not homework. At the science centre there's a vortex that you roll a ball down ... A: 1) If the pipe were tapered such that the decrease in the radius (thus causing an increase in the ... | |
| Ball spinning down a tube | 9/2/2011 |
| Q: I'm over 40, this is not homework. At the science centre there's a vortex that you roll a ball down ... A: Okay, I'm a little confused. I've been proceeding on the assumption that what you saw is similar to ... | |
| Gravity | 9/2/2011 |
| Q: I'm over 40, this is not homework. At the science centre there's a vortex that you roll a ball down ... A: 1. The ball will maintain its angular momentum (AM) the whole length down the tube. AM is a ... | |
| Neutral wire | 9/1/2011 |
| Q: i want to know that why we need neutral wire ? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Stimulated emission | 8/18/2011 |
| Q: Suppose an electron is in a higher energy level and a photon comes along with an energy equal to the ... A: The electron doesn't "need" a photon coming along to make it go down to a lower energy state. It's ... | |
| Invention of the Wheel - Circular Shape | 8/10/2011 |
| Q: Invention of the Wheel ---------------------- There are Two Wheelers, Three Wheelers and Four ... A: Try to imagine what a bicycle ride would be like if the tires of you bicycle were oval instead of ... | |
| EMF or gauss | 8/10/2011 |
| Q: I live about 300 feet away from hi power lines. I recently bought a gauss meter (dr.gauss name) to ... A: Let's make certain we understand what you're looking for, and why. Any time something electric ... | |
| Why we see bands in a rainbow | 8/3/2011 |
| Q: rainbow is formed by refraction and total internal reflection of sunlight from many water drops in ... A: The light that we end up seeing as a rainbow originates from one source (our Sun), and thus it ... | |
| Battery for boiling water | 7/28/2011 |
| Q: What other type of battery can you use to boil water rather than that of a car? A: I'm not sure I understand the question you want answered, but I'll answer the one you asked. Any ... | |
| Relativisitic mass | 7/18/2011 |
| Q: Sir what happens to the mass of the body when it approaches/greater than the speed of light? Will ... A: If an object, with mass m(0) when at rest in a frame, begins to travel at velocity 'v' with respect ... | |
| Dark matter as super-massive black holes | 7/9/2011 |
| Q: Is there any real evidence for the existence of dark matter? is it not more likely that all the ... A: > Is it possible to disprove this? Yes, very easily. Black holes leave VERY distinct traces of ... | |
| Breaking the sound | 7/8/2011 |
| Q: I'm working on a comics script with a "superhero" protagonist. The guy puts on his spandex, and ... A: > Do you think a human-sized and shaped object breaking the sound barrier > would produce a boom ... | |
| Breaking the sound "barrier" | 7/7/2011 |
| Q: I'm working on a comics script with a "superhero" protagonist. The guy puts on his spandex, and ... A: The problem with super-heroes knowing when they achieve Mach 1 is that most of the indications of ... | |
| Effects of plane mirror | 7/5/2011 |
| Q: This question may seem rudimentary to you but the answer has always escaped me; firstly does the ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| What is a modulated G-wave ? | 7/5/2011 |
| Q: Let me ask you a simple question, is there a possibility to transform the gravity potential energy ... A: > is there a possibility to transform the gravity potential energy > into electrostatic potentai ... | |
| Recombination (NOT Big Bang) in our Universe | 6/21/2011 |
| Q: the microwave radiation which was emitted as an aftershock of big bang is circulating around the ... A: About 377,000 years AFTER the Big Bang, the temperature and density of every part of our Universe ... | |
| 'He-Ne' Lasers | 6/21/2011 |
| Q: In Helium-Neon laser, why is the ratio of He to Ne 4 to 1? (as in why does He need to be supplied ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Smoke | 6/17/2011 |
| Q: Why do we get more smoke when we blow out a match? thanks A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Initial angular momentum | 6/17/2011 |
| Q: how did earth and other planets in our solar system start to go around the sun? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Evaporation and Water Cooling | 6/17/2011 |
| Q: .. We have a small, salt water swimming pool at our home in Mexico. Seasonally, right about now, ... A: In order to get maximum cooling, you need to maximum evaporation. Your question seems to be, "Would ... | |
| Boiling water | 6/16/2011 |
| Q: when you boil water ,what takes place during the boiling process A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| mass energy equivalence | 6/8/2011 |
| Q: when a body moves at a velocity close to that of light,mass of the body increases dramatically for ... A: The observer on Earth sees the Earth standing still, and a bomb coming towards it at near-light ... | |
| Schrodinger Equation | 6/8/2011 |
| Q: Would you be able to explain in simple words "Solutions to the Schrodinger Equation". And if ... A: Depends what you mean by "real life events." Two things to note about SE: 1) the number of ... | |
| Schrodinger Equation | 6/7/2011 |
| Q: Would you be able to explain in simple words "Solutions to the Schrodinger Equation". And if ... A: Not sure what you're asking for and, obviously, I have strong reason to think this is a request for ... | |
| An object falling from rest | 6/3/2011 |
| Q: Imagine you are at the top floor of a skyscraper. I am interested in knowing what happens when you ... A: > t2 is the time it takes for you to stop moving downward from the precise moment > when you touch ... | |
| Fourth spatial dimension | 6/3/2011 |
| Q: is 4th axis is possible or are there could be 4 dimensions? A: I presume you mean a fourth SPATIAL dimension. In other words, might our 3-d Universe be part of a ... | |
| An object falling from rest | 6/2/2011 |
| Q: Imagine you are at the top floor of a skyscraper. I am interested in knowing what happens when you ... A: Let's get some things straight here. 1) Whenever you are on the surface of our Earth, you are NEVER ... | |
| Atomic resonance | 6/1/2011 |
| Q: Atoms emit resonance. Because all objects (e.g. a table) are made of atoms, do they also emit some ... A: > atoms do emit (and absorb) vibrating energy? In the sense that electromagnetic energy (ie, light) ... | |
| Atomic resonance | 5/31/2011 |
| Q: Atoms emit resonance. Because all objects (e.g. a table) are made of atoms, do they also emit some ... A: Atoms do NOT emit a resonance. This statement is a misunderstanding of the fact that the differences ... | |
| Why is gravitational acceleration the same for all masses? | 5/26/2011 |
| Q: If you have a golf ball falling to earth the earth pulls on it with force "A". The golf ball pulls ... A: > 1. Why are their falling Accelerations the same if their interacting Forces are so different? ... | |
| Relativistic Time Dilation | 5/24/2011 |
| Q: my question is on relativity.Let us say two persons,one is standing still and other is moving with ... A: > So acceleration is responsible for time dilation? No. Remember the initial setup, where both ... | |
| Relativistic Time Dilation | 5/23/2011 |
| Q: my question is on relativity.Let us say two persons,one is standing still and other is moving with ... A: > Let us say person B comes back and meets person A after a long time, > and compare their ... | |
| Relativistic Time Dilation | 5/22/2011 |
| Q: my question is on relativity.Let us say two persons,one is standing still and other is moving with ... A: > one is standing still and other is moving with uniform velocity First thing to know about ... | |
| Innovative idea | 5/20/2011 |
| Q: Sir, I am a deputy engineer in an organization, which i don't want to disclose. I just , after ... A: I suggest you consult with a patent attorney. Depending on the contract you signed and the amount of ... | |
| "Fumes" from ice blocks | 5/18/2011 |
| Q: why fumes found around ice blocks.'Fumes' here I mean, like snow(fog) or like water vapor. A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Electron changes its spin number | 5/9/2011 |
| Q: If there is an atom whose last orbital requires one electron to complete it's octet and this orbital ... A: > If this is possible then in doing so the electron must go through a state where its has spin zero ... | |
| Bending of light | 5/7/2011 |
| Q: It is said that photon has a dual nature and while it propogates it is in wave nature.when the same ... A: You are correct to note two things: 1) a photon has no mass. 2) a photon will change its direction ... | |
| Sign convention for electric force | 5/5/2011 |
| Q: What is the sign conventions used while writing force between charged particles? negative for ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Electron movement | 4/23/2011 |
| Q: In a fluorescent light tube,thr electrons are excited and they jump from one energy level to the ... A: When events get to the quantum level, concepts like "movement" and "location" no longer have the ... | |
| Space battles | 4/22/2011 |
| Q: Would you please explain how rocket fuel burns in space, where there is no combustible gas? I have ... A: You will invariably find that people who create visual depictions of events are more interested in ... | |
| Lorentz Force | 4/22/2011 |
| Q: Consider two point charges each moving with velocoty, v, on the same plane along perpendicular ... A: > the relativistic field transformations describe how the magnitudes of the E-field > around a ... | |
| Rocket fuel | 4/22/2011 |
| Q: Would you please explain how rocket fuel burns in space, where there is no combustible gas? I have ... A: To parody an old saying, "This IS rocket science." The problem of how to provide enough oxygen to ... | |
| Lorentz Force | 4/20/2011 |
| Q: Consider two point charges each moving with velocoty, v, on the same plane along perpendicular ... A: Excellent question! I had to think about for a day or so, and I'm not TOTALLY sure I have the ... | |
| kinetic energy in a specific frame | 4/19/2011 |
| Q: My problem is with the formula E_k = 1/2 mv^2 for the kinetic energy. It looks possible to use a ... A: > It looks impossible to me that A observes that the rocket uses three times less fuel than what B ... | |
| kinetic energy in a specific frame | 4/19/2011 |
| Q: My problem is with the formula E_k = 1/2 mv^2 for the kinetic energy. It looks possible to use a ... A: > the amount of fuel the rocket is actually consuming should be invariant in both reference frames. ... | |
| Calculating speed | 4/19/2011 |
| Q: I have always been curious as to how fast I am traveling at peak speed while wakeboarding. ... A: Your forward speed was 22.5 mph, or 33.1 feet per second. That's the easy part. Taking a quick ... | |
| kinetic energy in a specific frame | 4/19/2011 |
| Q: My problem is with the formula E_k = 1/2 mv^2 for the kinetic energy. It looks possible to use a ... A: > What do I miss? Actually, nothing. The problem is that, when discussing conservation of any ... | |
| radiation from monitors | 4/18/2011 |
| Q: what kind of radiation does a tv and a computer that is not wireless emit? thanks, gia A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Entropy, emergence, and energy | 4/13/2011 |
| Q: Expert, Whenever we observe emergence, can we assume that somewhere there is a corresponding ... A: Okay, let me rephrase your question to this: "Does the total entropy of any closed, total system ... | |
| Emergence | 4/13/2011 |
| Q: Expert, Whenever we observe emergence, can we assume that somewhere there is a corresponding ... A: Please define, in your own words, the word "emergence." It seems to have a a specific scientific ... | |
| Newton's Third Force Law | 4/13/2011 |
| Q: is 3rd law also follow in cricket???means vn ball came 2batsman and batsman pushses....dn action and ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Units of electricity | 4/11/2011 |
| Q: If a Weber is a VoltSecond, and a Weber x an Amp = Electricity. How can an Amp be defined as Charge ... A: An old joke warns against bad writing by saying, "Don't change horse metaphors in the middle of ... | |
| physics | 4/10/2011 |
| Q: why are buildings not falling down A: I presume because they are sufficiently well-built to not do so. I also presume you'll want more ... | |
| Mass with only two dimensions | 4/9/2011 |
| Q: Is it possible in our 3D world for a particle of Mass to be only 2 dimensional ? Thanks, Craig ... A: The short answer is no. > Is it possible for Mass to be divided by Distance The slightly longer ... | |
| Miles Mathis | 4/9/2011 |
| Q: Could this really be true ? http://www.milesmathis.com/angle.html Thanks, John A: Any time a person without doctoral level scientific training claims s/he has discovered something ... | |
| Mass with only two dimensions | 4/9/2011 |
| Q: Is it possible in our 3D world for a particle of Mass to be only 2 dimensional ? Thanks, Craig A: The short answer is no. An object with mass can not have EXACTLY two dimensions. The longer answer ... | |
| Speed of sound | 4/5/2011 |
| Q: Does the speed of sound depend on the observer. I know the frequency does, by Dopplers' effect? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| effects of gravity | 4/4/2011 |
| Q: the recent earthquake and tsunami in japan leads me to question the influance of gravity ... A: > the moon is in its lowest orbit in 17 years and Not quite correct. Our Moon is at its perigee ... | |
| Energy | 4/2/2011 |
| Q: Not homework. A heavy lead ball falls for a period of time (Mass x Acceleration x Time) or (Mass x ... A: I'm not sure I fully understand the question, so I'll just explain the energy situation. When the ... | |
| magnetism in vacuum | 3/31/2011 |
| Q: Does magnetism occur in vacuum?why? A: Magnetic lines of force can exist in a vacuum. Indeed, the magnetic fields surrounding the planet ... | |
| Clarification regarding circular motion | 3/29/2011 |
| Q: Sir, I have a basic doubt for long in the example of a car moving along a circular motion. After ... A: Every where it says that it is the frictional force between the ground and the tire that provides ... | |
| Hockey Stick question | 3/26/2011 |
| Q: My apologies for not paying full attention to your description when I asked my question. I now note ... A: > My apologies for not paying full attention to your description Your apology is accepted. > what ... | |
| Basic physics definitions | 3/25/2011 |
| Q: um I'm in 8th grade and were touching the subject of 'Physics' and I understand it mostly, however ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure that my help is ... | |
| liquid falling out of a straw | 3/25/2011 |
| Q: A debate with a friend lead gave me a randomWhen you drink out of a straw, you have a suction force ... A: > Am I misunderstanding? No. You are correct, your friend is wrong. Pretty much the entire reason ... | |
| Hole from one equator point to another | 3/25/2011 |
| Q: I have been thinking about a thought experiment in which you dig a hole from one point on earth to ... A: What you will experience is called the "Coriolis Effect." ... | |
| Anti-Time | 3/25/2011 |
| Q: Is there any such idea or concept in physics as anti-time? Meaning something I do now will create an ... A: The short answer is, "No." As far as we know, there is no way to do so. Probably the long answer is ... | |
| Gravitational potential | 3/22/2011 |
| Q: why gravitation potential is negative and maximum value is zero at infinity? A: > maximum value is zero at infinity? The choice of where to set a zero point -- indeed, where to ... | |
| Energy of nuclear fission | 3/20/2011 |
| Q: Energy is released in nuclear fission because the average binding energy per nucleon of the fission ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Energy conservation with heat | 3/19/2011 |
| Q: I know that energy cannot be created nor destroyed but can only be converted from one form to ... A: > wouldn't the atmosphere heat up? That (for the most part) is EXACTLY what happens! Just not by ... | |
| Energy conservation with heat | 3/19/2011 |
| Q: I know that energy cannot be created nor destroyed but can only be converted from one form to ... A: > what happens to the energy then? > The heat and sound don't go forever... Actually, they do. The ... | |
| Why are "super" moons so rare? | 3/19/2011 |
| Q: in the previous Q I meant 27 days and not 24 hrs,the time period for one rev around the earth.sorry ... A: Obviously, our Moon reaches its perigee once every 27 days. However, this perigee does not always ... | |
| Induction Magnetometer | 3/18/2011 |
| Q: Why does HAARP's INDUCTION MAGNETOMETER in Alaska pick up so much activity in the days leading up to ... A: Perhaps a pre-cursor to a major earthquake is slight changes in the Earth's magnetic flux. Whether ... | |
| Movement on a molecular level | 3/17/2011 |
| Q: Hey there, As the subject line states, my question relates to the ability to control and move ... A: Controlling matter at a molecular or lower level would, I think, give the following abilities: 1) ... | |
| Surface tension | 3/16/2011 |
| Q: I have understood that why the surface gets contracted(minimizes its area) under surface tenion, but ... A: Although I cannot find these words ANYWHERE in the URL I noted ... | |
| Law of radioactive decay | 3/14/2011 |
| Q: I have published this hypothtical paper on scitopics.com and would appreciate if you could solve ... A: As with most formulae, the one for radioactive decay is a statistical approximation, good only for ... | |
| Surface tension | 3/13/2011 |
| Q: I have understood that why the surface gets contracted(minimizes its area) under surface tenion, but ... A: I do not see the phrase "negative potential energy" in the article. Could you quote the EXACT ... | |
| State function, Path function | 3/13/2011 |
| Q: Sir,my Q is:How can we say that a function say internal energy is state variables and not a path ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Magnetic force | 3/5/2011 |
| Q: could you explain why a conductor with current flowing through it exhibits a magnetic field with ... A: > why the force on the same wire [is] instead perpendicular I'm presuming that, ultimately, you're ... | |
| Sectional density of the human body | 3/2/2011 |
| Q: Once a human leaves the ground and propels himself at another human example a football player ... A: > Do they turn into a projectile? If you want to refer to a person in that way, I can't stop you. ... | |
| Einstein using trains to explain relativity | 3/2/2011 |
| Q: I am seeking confirmation and direction to the best known concepts in physics that were/are ... A: My internet search for the terms relativity einstein train yielded almost 88,000 hits. Amongst the ... | |
| fundamental quantity | 3/1/2011 |
| Q: i have a really basic question what does world made of?is it made from time,length,mass,q,or from ... A: At its most basic level, as best we can tell, our Universe consists of quarks, leptons, and bosons. ... | |
| Calculating forces | 3/1/2011 |
| Q: Find the coefficient of kinetic friction between a 3.85-kg block and the horizontal surface on which ... A: As it's now been over a month since this homework question was asked, it will give no unfair ... | |
| Weight and airflow | 2/28/2011 |
| Q: what is lighter helium or air and witch one has a better airflow when coming out of a balloon. A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| boiling water a second time | 2/28/2011 |
| Q: If water has been boiled in a teakettle, then cooled, will it be as hot if brought to a boil again? A: I'll rephrase thedoes water that has been boiled have a different boiling point than water that has ... | |
| Relativity | 2/26/2011 |
| Q: suppose that a man is moving in its car with the speed of light then what will happen? does the ... A: I'm going to change the question to "someone is moving in a car at a constant velocity NEAR the ... | |
| Sending water into space | 2/23/2011 |
| Q: I have a number of scenarios i've thought about over the years. I have drawn a simple diagram to ... A: Your question is very interesting, mainly because the scenario you suggest -- taking water out of ... | |
| Potential energy of a system | 2/23/2011 |
| Q: There are two dust particles of equal mass and equal positive charge. They are separated by a ... A: As it's now been over a month since this homework question was asked, it will give no unfair ... | |
| Electric field within a uniformly charge sphere | 2/22/2011 |
| Q: Consider a sphere of radius R=7.5 m where a charge Q=9.0 microcoulombs is uniformly distributed ... A: As it's now been over a month since this homework question was asked, it will give no unfair ... | |
| rotation | 2/22/2011 |
| Q: I want to ask about a comman observation which has an unanswered question. i want to know why the ... A: > I want to ask about a comman observation which has an unanswered question Actually, this common ... | |
| Need more info to help | 2/21/2011 |
| Q: Could you please explain to me (preferably as simply as possible) the physics behind the microwave ... A: I am unable to answer this question unless I know how complicated an explanation is "too ... | |
| angular momentum | 2/21/2011 |
| Q: Can you assist me with this? An 8 k8 shot makes 7 complete revolutions during it 2.5 sec flight. If ... A: As it's now been over a month since this homework question was asked, it will give no unfair ... | |
| Transmission of radio and TV | 2/20/2011 |
| Q: sir why cable Tv is preffedred? Also tell how transmission of radio waves can be heard in hilly ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Force and power defined | 2/18/2011 |
| Q: When trying to understand the basic relationships between force, power and energy by applying the ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Energy in an electric field | 2/18/2011 |
| Q: I am not able to find solution for homework question A uniform electric field E = 3400 V/m exists ... A: As it's now been over a month since this homework question was asked, it will give no unfair ... | |
| Acceleration and force | 2/17/2011 |
| Q: A ball falling is Force (Mass x Acceleration) When the ball comes to rest on the earth, it still ... A: Apparently you did not read my initial sentence in this response. Or, if you did, you either ignored ... | |
| Work, Electric Potential | 2/16/2011 |
| Q: WHAT WORK IS REQUIRED TO BRING A CHARGE OF 2 X 10^-7 Coulomb FROM A POINT IN VACUUM 30cm FROM A ... A: As it's now been over a month since this homework question was asked, it will give no unfair ... | |
| Acceleration and force | 2/15/2011 |
| Q: A ball falling is Force (Mass x Acceleration) When the ball comes to rest on the earth, it still ... A: > A ball falling is Force (Mass x Acceleration) You reveal a misunderstanding right at the start. ... | |
| Change of energy | 2/14/2011 |
| Q: A sports car accelerates rapidly from a stop and "burns rubber" A. What energy transformations ... A: As it's now been over a month since this homework question was asked, it will give no unfair ... | |
| Velocity and acceleration | 2/13/2011 |
| Q: At the beginning of a 3.00 h plane trip, you are traveling due north at 192 km/h. At the end, you ... A: As it's now been over a month since this homework question was asked, it will give no unfair ... | |
| Units of mass and weight | 2/10/2011 |
| Q: It seems as if, in common usage of units of weight, kilogram is used as the equivalent to pounds in ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Dent in Mass | 2/9/2011 |
| Q: A dent that occurs in a piece of Mass (being formed in the Mass). How is that occurance defined via ... A: As far as I know, "dent" has no mathematical definition. It's just an indentation in an object ... | |
| Orbit of our Moon | 2/9/2011 |
| Q: What is the ratio of the accelerations, velocities and positions (with respect to the center of ... A: As it's now been over a month since this homework question was asked, it will give no unfair ... | |
| Spring, force, and momentum conservation | 2/4/2011 |
| Q: Two blocks, one if mass m1= 10kg and the other of mass m2= 50 kg are attached to a rope. Between ... A: As this homework question was asked over a month ago, it will give no unfair advantage to the ... | |
| Physics of roller coasters | 2/3/2011 |
| Q: When it comes to Physics… What is the excitement about amusement park rides, roller coasters in ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Magnetic Fields and electrons | 2/3/2011 |
| Q: Why do magnetic fields interacting create electricity How do we know irons electrons go in 4s A: > Why do magnetic fields interacting create electricity I presume the question is, "Why does a ... | |
| Effect of g-force | 2/3/2011 |
| Q: Can you help with this? Fighter pilots, astronauts, and roller coaster riders are exposed to a ... A: It being a month since this question was asked, whether or not it was a homework assignment is now ... | |
| Publishing experimental results | 2/1/2011 |
| Q: Yes, and if you please...Can you tell me or give me my best chance to get my work noticed/published ... A: Your best bet would be to submit a paper to a scientific journal like Physics Review Letters ... | |
| Moving objects hitting human | 1/31/2011 |
| Q: If a baseball is to travel at 300 mph would it be able to penetrate through a human body A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Mechanics | 1/28/2011 |
| Q: A moving object on the surface of the earth stops due to friction & air resistance. Is it right? ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Scientific Method | 1/20/2011 |
| Q: What is the correct definition of a hypothesis in experimental science? I understand that it (or a ... A: > I'm asking because I'm curious about the threshold of rigor required to do "good science"; > at ... | |
| Waves | 1/16/2011 |
| Q: How the physics experts knows something are waves? A: I hesitate to use the wording that things "are" waves. Instead, I will note that many entities (what ... | |
| Plane Of Polarization Of EM waves | 1/15/2011 |
| Q: This statement comes from my textbook : The plane of polarization of an EM wave is the plane in ... A: > what does plane of polarization mean? Strangely enough, your textbook answers your question. > ... | |
| Forms of energy | 1/15/2011 |
| Q: Homemaker wrote: Heat is a joule or a kilogram-meter2/sec2 -- exactly the same unit as any other ... A: > Electricity (ENERGY !) enters your stove and you think that "Heat" is the only result ? Never ... | |
| You responded EXACTLY as I predicted | 1/14/2011 |
| Q: Hey nonExpert, Are you all about semantics or what ? If a man (Planck) presents an equation ... A: Just like I predicted, you failed to even TRY to state where Max Planck said what Mr. Zeeper said ... | |
| magnetic fields in the atom | 1/14/2011 |
| Q: There are magnetic fields in an atom that make it feel solid and the spin of the atoms makes a ... A: > There are magnetic fields in an atom that make it feel solid Actually, it's the E-field of the ... | |
| B-field from DC wire | 1/14/2011 |
| Q: There is a steady magnetic field around a wire with a direct current flowing..where is the north ... A: For a good understanding of the magnetic field (also called the 'B-field') around a long wire ... | |
| Energy stored in magnetic field | 1/14/2011 |
| Q: Do magnets store energy..they can attract other metal objects and we know that to move an object ... A: There is an energy density in any magnetic field. ... | |
| High speed objects | 1/14/2011 |
| Q: is it possible for an object to pierce / break through another object, of greater hardness, with ... A: I suppose that, if a softer object (copper pellet) struck a THIN layer of a harder material (like ... | |
| Planck's statements | 1/14/2011 |
| Q: Hey buddy, (term used extremely "loosely") Who do you think you are ? ? ? And since when is the ... A: As I have stated already, if anyone can show me, in a book or a paper written by Max Planck, that he ... | |
| Parallel circuits | 1/13/2011 |
| Q: why is it voltage in a parallel circuit is equal? wondering..thanks ANSWER: Changes in voltage (or ... A: Take a look at a parallel circuit: http://www.gcsescience.com/pe19.htm ... | |
| Drop in voltage | 1/13/2011 |
| Q: why is it voltage in a parallel circuit is equal? wondering..thanks A: Changes in voltage (or "potential difference" or just "potential") in a circuit occur only when a ... | |
| Ionizing Radiation | 1/13/2011 |
| Q: "Maybe you can help? I found this on the web do you think it's credible? The following excerpt was ... A: > smoke detector manufacture after 1980 contains 0.9 microcuries (µCi) of Americium-241 This would ... | |
| uranus planet | 1/12/2011 |
| Q: why orbital velocity of Uranus differ than calculated velocity according to classical mechanics A: I'll need a link to a URL that discusses the discrepancy you mention -- a quick look at URLs ... | |
| EM waves | 1/11/2011 |
| Q: Wow..thanks for that very clear answer ! As a follow up question, EM radiation/wave have an E ... A: > do some materials eg metal respond more to the B field and less to the E field? No. Almost all ... | |
| EM waves | 1/10/2011 |
| Q: Waves of long wave lenghts can bend around objects like radiowaves bending around a wall but shorter ... A: As you correctly note, all of these phenomena -- radio waves, microwaves, and X-rays -- are ... | |
| Double slit experiment with one detector | 1/10/2011 |
| Q: Richard, I have a query that no books seem to answer! In the classic electron double slit ... A: When dealing with quantum measurement, you have to rid yourself of certain classical concepts. ... | |
| Double slit experiment with one detector | 1/9/2011 |
| Q: Richard, I have a query that no books seem to answer! In the classic electron double slit ... A: Although I am not 100% certain I have the right answer, permit me to give my best opinion. What ... | |
| Great Minds | 1/4/2011 |
| Q: I was wondering if you could tell me which of these three made the most significant contribution: ... A: Before I can answer about "the most significant contribution," you'll have to define "significant." ... | |
| Photon mass as zero | 12/30/2010 |
| Q: why do we take mass of photon as zero?. i know because it travels with velocity 'c' and in mass ... A: > why do we take mass of photon as zero? Two reasons: 1) Relativity requires zero mass for ... | |
| vacuum temperature | 12/19/2010 |
| Q: If all space is pervaded by the CMBR, which has approx. 4K temperature, is that the temperature of ... A: Quantum vacuum energy is the energy that would exist in a volume of space if there were ABSOLUTELY ... | |
| Energy | 12/18/2010 |
| Q: Most text books show EM waves oscillating at 90 deg.and of the same amplitidude must the E field be ... A: Richard Feynman said in his textbook that energy conservation is often a good place to start when ... | |
| Spectral line splitting in B-field | 12/12/2010 |
| Q: could you please explain splitting of spectral lines in presence of magnetic field taking electron ... A: http://en.wikipedia.org/wiki/Zeeman_effect Spectral lines arise because electrons are changing from ... | |
| When to use quantum physics | 12/1/2010 |
| Q: I wanted to know, how to decide in which situations classical physics are sufficient and in which ... A: To get more mathematical, a general rule is that quantum effects can generally be neglected if the ... | |
| When to use quantum physics | 11/30/2010 |
| Q: I wanted to know, how to decide in which situations classical physics are sufficient and in which ... A: > Is there any general way to decide I wouldn't say there's a "rule" about when to use one approach ... | |
| Image and reality | 11/25/2010 |
| Q: In the physics text book, it is mentioned that an image is formed at the intersection of reflected ... A: > 1) How is actually an image formed in reality as ray diagram > is just a geomatric (space), not ... | |
| EM radiation | 11/24/2010 |
| Q: Sir, Thanks you for replying so quickly and in such a clear and succint way. You mentioned ... A: As I noted earlier, there are several ways for EM radiation can result. I'll just mention three of ... | |
| Electron flow during current | 11/23/2010 |
| Q: When an electric field is applied across a metal this causes the "free" electrons to flow and this ... A: > What is the difference between this drifting from one end > of the wire to the other end and ... | |
| angular displacement | 11/20/2010 |
| Q: A fan rotating at 2.1 radian/s slows down with a constant acceleration and comes to a stop in a ... A: Since it's been almost a month since this homework question was asked, answering it now will not be ... | |
| Skateboarding and Momentum | 11/19/2010 |
| Q: How do I get momentum in skate boarding? If you know please tell me thank you. A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Why matter feels solid | 11/17/2010 |
| Q: Why do solids appear solid when there is mainly empty space in atoms making up those solids. ... A: Bizarre as it sounds, this ALSO gets to the question over what happens when we "feel" something. ... | |
| WAVES in quantum mechanics | 11/17/2010 |
| Q: Are sound waves a part of the study of quantum mechanics? ANSWER: In general, no. ---------- ... A: Wave mechanics are most definitely a part of the study of QM. Indeed, one cannot understand the ... | |
| Why matter appears solid | 11/17/2010 |
| Q: Why do solids appear solid when there is mainly empty space in atoms making up those solids. A: You correctly note two things: 1) about 99.99% of what we call "matter" (not just solids) is empty ... | |
| Baseball and truck | 11/15/2010 |
| Q: My friend and were driving on the freeway and he asked me, "Since we're going 65 mph what would ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Units for energy and power | 11/14/2010 |
| Q: A Joule divided by a Second = a Watt kgm2/s2 divided by a Second = kgm/s3 = a Watt When you ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Force of object | 11/13/2010 |
| Q: Well, you really did not get it, did you? I am not a student, because if I were one, I would ask my ... A: Not sure why you changed your name from "Leo" to "Len" to "BBKing," but I'll abide by your request: ... | |
| Force of impact | 10/30/2010 |
| Q: You are such a pathetic dumb-ass. You are not answering "school" questions, you are not answering ... A: As to questions that I am willing to answer, what I say may come as a shock to you. Some people ... | |
| Wave propagation | 10/28/2010 |
| Q: 1) In physics, a wave is defined as a disturbance. Is disturbance a physical quantify? In my ... A: > a wave is defined as a disturbance. > Is disturbance a physical quantify? No, a "disturbance" ... | |
| Physics | 10/27/2010 |
| Q: When do a combination of two quantities have a physical meaning? A: Before I can give a meaningful answer, I would need to know exactly what you mean by "combination," ... | |
| centripetal force, centrifugal force | 10/26/2010 |
| Q: Why the height of racing car is kept small? what would happen if earth stops rotating around sun? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Could a high pressure air jet cut objects? | 10/25/2010 |
| Q: Water jets are sometimes used for cutting metal, and I was wondering if the same thing could be done ... A: The use of air jets for cutting metal is a technology already in place. As you correctly note, it's ... | |
| momentum | 10/25/2010 |
| Q: I am taking a Radiologic Physics course online and unfortunately it's offered only online and my ... A: Since it's been almost a month since the question has been asked, I'll answer it to assist others ... | |
| Radioactivity | 10/23/2010 |
| Q: do element emit all radiations means alpha, beta and gamma at same time or only one type of emission ... A: > uranium always emit all three radiation > or it depends on some factors? > what are these ... | |
| calculation of arrow momentum ? | 10/23/2010 |
| Q: Good morning I do bow hunting and it is important to know what the momentum of my arrow will be to ... A: Very well. Apparently, in the totally outdated and almost completely un-usable system of ... | |
| Radioactivity | 10/22/2010 |
| Q: do element emit all radiations means alpha, beta and gamma at same time or only one type of emission ... A: Some isotopes of some elements decay by emitting an alpha particle. Other isotopes of other elements ... | |
| calculation of arrow momentum ? | 10/22/2010 |
| Q: Good morning I do bow hunting and it is important to know what the momentum of my arrow will be to ... A: You will make this calculation a LOT easier if you did all of your calculations in metric units. ... | |
| Resonance | 10/20/2010 |
| Q: I was wondering, if you have a pipe (open air column) that's able to resonate at 440hz. I know that ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Improper depth perception in water | 10/16/2010 |
| Q: I cannot fathom out why fishes and objects in the water could be seen much 'shallower' than in ... A: Your question seems to be, "Why do our eyes view the depth of objects in water incorrectly?" If ... | |
| thermodynamics | 10/15/2010 |
| Q: why when a gas is expanded its temperature decreases? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Time travel problems | 10/13/2010 |
| Q: Time Travel. Is it true that the physical location of the earth in the universe has never been the ... A: First thing to know: human time travel is not possible by any means we now know about. The only way ... | |
| Photons | 10/11/2010 |
| Q: Sir, why is the rest mass of a photon said to be zero?does it mean it's absolute mass when there is ... A: > why is the rest mass of a photon said to be zero First of all, the photon does NOT have a rest ... | |
| Bubble formation in poured fluids | 10/9/2010 |
| Q: first of all,I'm not a native English speaker,so if I make a grammar mistake of some sort,pardon me. ... A: I did an internet search for the terms bubble formation pouring water and found this URL ... | |
| Buoyancy | 10/5/2010 |
| Q: Why isit that a metal ball would take a longer time to reach the seabed in the ocean when it gets ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Approaching a mirage. | 10/3/2010 |
| Q: Some people say that we can never reach the mirage and it will seem like the mirage is moving away ... A: > as she approach the mirage by getting closer to point B, > the light rays can't bend into her eyes ... | |
| Approaching a mirage. | 10/2/2010 |
| Q: Some people say that we can never reach the mirage and it will seem like the mirage is moving away ... A: Take a look again at Figure 4 in the URL I posted. This figure (correctly) shows that someone ... | |
| Fly on a train. | 10/1/2010 |
| Q: I understand that if I was standing on a moving train and I jump I would not move back as the ... A: First thing to know about the "velocity" of an object is that you MUST define what the velocity is ... | |
| Approaching a mirage. | 9/27/2010 |
| Q: Some people say that we can never reach the mirage and it will seem like the mirage is moving away ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Fission process | 9/25/2010 |
| Q: Fission process is uncontrollable without graphite rods,as we know that one hydrogen atom releases ... A: > Fission process is uncontrollable without graphite rods Actually, the fission process is VERY ... | |
| Voltage and resistance in light bulbs | 9/25/2010 |
| Q: my question is that, more resistance means more opposition to electricity,then in high power bulbs ... A: First of all, read this URL ... | |
| bouyancy | 9/19/2010 |
| Q: What is the depth an average person becomes bouyant. We are installing an inground pool and want to ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Atom VS the Solar System:too similar? | 9/15/2010 |
| Q: What is the difference between the atoms of hydrogen & helium?I understand that they are the ... A: > What is the difference between the atoms of hydrogen & helium? > Is it that helium has another ... | |
| Buoyancy | 9/11/2010 |
| Q: A previous question asked theIf a brick were dropped into an infinitely deep ocean, would it ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Physics: discovery or imposition? | 9/7/2010 |
| Q: I have had this discussion with someone who asserts the following: we impose systems of ... A: *MY* thoughts? For what they're worth (and I don't claim that mine are any more valuable than yours, ... | |
| Learning physics | 8/30/2010 |
| Q: It's not really a question regarding physics, but more about your approach when you reach ... A: > you find yourself reaching these points where > you just cannot wrap your head around certain ... | |
| Magnetic field | 8/30/2010 |
| Q: 1) I have seen two terms ( i.e. " field line" and " lines of force") are used in the context of ... A: For an electric field, the "field line" and the "line of force" are ALMOST the same thing, with one ... | |
| Acceleration of baseball/bullet | 8/29/2010 |
| Q: We were watching a baseball game on TV the other night, which got me to thinking: doe the maximum ... A: I fear you are confusing "speed" with "acceleration." The SPEED of the ball is maximum when it ... | |
| Inductance | 8/29/2010 |
| Q: when we connect a D.C source acroos a inductor it works as a short circuit means as a wire while ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Speed of baseball/bullet | 8/29/2010 |
| Q: We were watching a baseball game on TV the other night, which got me to thinking: doe the maximum ... A: > if the ball is accelerating as it leaves the hand > (as it seems it would be This is where you ... | |
| Inductance | 8/28/2010 |
| Q: when we connect a D.C source acroos a inductor it works as a short circuit means as a wire while ... A: The very purpose of an inductor is to prevent any CHANGE in the current (or voltage, if you prefer) ... | |
| Ink in Ball Point Pen | 8/28/2010 |
| Q: Sir, I observed something odd this evening. When I inverted my ball point pen, there was no change ... A: What I presume you observed were these two events: 1) the ink in your ball point pen did not come ... | |
| AC generators | 8/28/2010 |
| Q: SIr few questions on AC generator and altrnating current. 1) In all textbooks i have seen it is ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Mirror images | 8/20/2010 |
| Q: This is a hard question to articulate in writing so please bear with me if I say the same thing in ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Electron movement and energy transmission | 8/20/2010 |
| Q: We are taught about the electrical "charge". But we are not clear what "the charge" actually is. Is ... A: You take note of a seeming contradiction -- that an electron, in a copper wire with electricity ... | |
| When, exactly, does something "occur"? | 8/19/2010 |
| Q: The recent announcement about R136 got us talking in the office. Given its distance from the Earth, ... A: Ah, if only it were 1904 instead of 2010, I could answer this question in a few seconds. In ... | |
| What is charge? | 8/19/2010 |
| Q: We are taught about the electrical "charge". But we are not clear what "the charge" actually is. Is ... A: Permit me to clarify. When I say that charge is "a property," I mean it is something that a particle ... | |
| What is charge? | 8/18/2010 |
| Q: We are taught about the electrical "charge". But we are not clear what "the charge" actually is. Is ... A: > we are not clear what "the charge" actually is. > Is it a mass or is it an energy? "Charge" is ... | |
| regarding the balancing of the bicycle | 8/10/2010 |
| Q: I checked the answer given by you for the balancing of bicycle. but i could not able to get with ... A: I presume you are talking about this answer ... | |
| Your INSTRUCTIOINS | 8/1/2010 |
| Q: The first line under your "Instructions" reads I am not a psychic. It should read "I am not a ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| gravitational potential energy | 7/27/2010 |
| Q: regarding to the previous question asked about potential energy, but if i have a ball of mass 2 ... A: Let me re-iterate: the potential energy of an object is between whatever two points you specify. As ... | |
| Electromagnetism | 7/27/2010 |
| Q: Isn't it true that a magnetic field must exist in the presence of moving charges?Then, how come ... A: > Is it because of the moving electrons. > If so, why not electrons of other material? First thing ... | |
| quantum foam and dark matter | 7/26/2010 |
| Q: could you give me a simplified explanation of quantum foam and dark matter A: I can TRY to do so. Dark matter is the still unknown matter that is out there, that interacts with ... | |
| Graviton in Relativistic Physics | 7/24/2010 |
| Q: I was just wandering if the General Theory of Relativity supports the existence of a graviton. From ... A: > if the General Theory of Relativity supports the existence of a graviton Actually, quite the ... | |
| Calculating potential energy | 7/22/2010 |
| Q: when we talk about potential energy, do we just calculate it to the place it would fall to or ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| evaporation | 7/21/2010 |
| Q: can diffusion take place on 2 states? for example can liquid diffuse with gas? is evaporation caused ... A: "Diffusion" is when molecules of one type move, in a random manner, from areas of higher ... | |
| Particle diffusion | 7/21/2010 |
| Q: particles diffuses, but why isit that oil dont diffuse with water? A: Two reasons: 1) Water molecules are heavily ionic (ie, one side is positive and the other ... | |
| Quantum Mechanics | 7/20/2010 |
| Q: I have a question about the double slit experiment: In order to collapse the wave function of ... A: Any time you locate a particle -- be it an electron or a photon -- where it is or where it is not, ... | |
| light speed | 7/10/2010 |
| Q: I love physics and the science that goes along with it especially when it comes to outer space. ... A: The basic answer is that we would not notice the difference, other than times when we actually tried ... | |
| Source of energy for electrical charge | 6/17/2010 |
| Q: What is the source of energy to power the electric charge field of the electron? A: It is apparent that you are sufficiently well-informed to know that-- 1) all electrons have charge. ... | |
| vacuum technology | 6/14/2010 |
| Q: I was hoping you could help my brother and I with an argument we have regarding vacuum technology. ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| hole in the ozone layer | 6/10/2010 |
| Q: Just curious but what evidence is there that cfc gases are the cause of the hole in the ozone layer? ... A: This URL http://en.wikipedia.org/wiki/Ozone_layer_depletion should answer your questions to a far ... | |
| Cavitation of seawater | 6/10/2010 |
| Q: I was wondering if cavitation of seawater produced mixed gases (air) or a flammable gas (oxygen)? ... A: > cavitation of seawater produced mixed gases (air) or a flammable gas (oxygen)? Neither. As this ... | |
| Acceleration while falling | 6/2/2010 |
| Q: How can we say that the acceleration of any object does not depend on the mass of the object during ... A: > So can we say that two objects > (one with a small mass and the other with a slightly less mass ... | |
| Acceleration while falling | 6/1/2010 |
| Q: How can we say that the acceleration of any object does not depend on the mass of the object during ... A: > How can we say that the acceleration of any object does not depend > on the mass of the object ... | |
| Acceleration/Deceleration, and very probably momentum and inertia. | 6/1/2010 |
| Q: As I approach (say) some traffic lights in my car I gently apply the brakes. The car decelerates ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Nuclear fusion | 5/31/2010 |
| Q: When hydrogen nuclei fuse to form helium where do the neutrons (in the helium nucleus) come from? ... A: > The Hydrogen cannot supply them having only a proton in the nucleus. Ahh, that's SIMPLE hydrogen. ... | |
| Electrolysis | 5/23/2010 |
| Q: when water reaches its boiling point, the gas that is released: is it pure hydrogen or pure oxygen? ... A: The best way to get info on this chemical reaction is to do an Internet search for water ... | |
| physics | 5/23/2010 |
| Q: when water reaches its boiling point, the gas that is released: is it pure hydrogen or pure oxygen? ... A: > when water reaches its boiling point, the gas that is released > is it pure hydrogen or pure ... | |
| Lightning | 5/20/2010 |
| Q: Is it safer to stay inside a car during lightnings.I mean it's metal so won't the lightning bolt ... A: Check out answer #3 in this URL; www.mos.org/sln/toe/safety.php as well as the last part of this ... | |
| Newton's third law on hitting a pillow | 5/18/2010 |
| Q: this is regarding Newton's third law. That for every action, there is an equal and opposite ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Creating a system | 5/18/2010 |
| Q: What does the following article mean? The phase velocity of the wave is half the velocity of an ... A: > But if we can really create this kind of system, what will it happen? I'm not sure what you mean ... | |
| Meaning of "phase velocity" | 5/17/2010 |
| Q: What does the following article mean? The phase velocity of the wave is half the velocity of an ... A: In classical physics -- the type we think of as "normal" -- an electron moves like a small ball with ... | |
| Oil and water | 5/16/2010 |
| Q: air particles bounce and coes it to be all around. and diffusion too, it would spread. but why oil ... A: Liquids are a different state of matter from gases. For liquids to diffuse amongst each other, they ... | |
| diffusion | 5/4/2010 |
| Q: can i say that diffusion occur as particles bounce against one another, resulting in some of the ... A: I'm not able to figure out EXACTLY what you are asking, but I will note that diffusion of a gas into ... | |
| Mass with gravity AND acceleration | 5/1/2010 |
| Q: Since the gravitational attraction between two objects varies with their mass at given distance per ... A: You are completely correct to note that the gravitational force on an object with larger mass is ... | |
| Gaseous mixture | 4/30/2010 |
| Q: okay, i wondered about this. air is a mixture consisting of hydrogen, oxygen and more. but if oxgen ... A: > wont all the hydrogen float up above all the gases and is found only at the top part? Note QUITE. ... | |
| stability | 4/25/2010 |
| Q: how do you determine an object stability? can i say that an object that has a higher centre of ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| car | 4/15/2010 |
| Q: i know that when i push a block up a hill is more difficult as compared to i push a block on a ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Dispersion of light into a spectrum | 4/14/2010 |
| Q: I wonder what happens when a beam of light is passed through a drop of water hanging from a straw. ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Theory vs Experiment | 4/12/2010 |
| Q: Sir,I have a few very common Qs, 1)Why is Gravitational force always attractive? 2)Why doesn't the ... A: 1) Why is gravity always an attractive force? Ultimately, the answer to this question is easy, but ... | |
| Time travel films site | 4/10/2010 |
| Q: I know this is probably a long shot, but about five years ago, I used to visit this web site ... A: All I can do is list some sites THAT might have been what you were looking for: ... | |
| Usefulness of science | 4/10/2010 |
| Q: I find the following article "So, do we really respond to a thing? Don't we respond' only the ... A: > Do you mean that if science experiment cannot prove whether our perception itself is true or ... | |
| Bubbles | 4/9/2010 |
| Q: Why are bubbles spherical? Does it have to do with surface area? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| pulling and pushing | 4/9/2010 |
| Q: I'm thinking of this for some time. what cost more energy pulling or pushing something. A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Is science self contradictory? | 4/9/2010 |
| Q: I find the following article "So, do we really respond to a thing? Don't we respond' only the ... A: > so can I say that science can't prove that whether a event or a thing is REAL or NOT REAL? At the ... | |
| Is science self contradictory? | 4/9/2010 |
| Q: I find the following article "So, do we really respond to a thing? Don't we respond' only the ... A: > Is science part of reality or reality is part of science? Neither. Science is a method whereby we ... | |
| Is science self contradictory? | 4/8/2010 |
| Q: I find the following article "So, do we really respond to a thing? Don't we respond' only the ... A: > 1) What is science? Science is an approach to what we perceive, with a basic goal of ... | |
| physics | 4/8/2010 |
| Q: the gyroscope is so nice. but i am not sure about this, as the middle of the gyroscope is spinning, ... A: > as the middle of the gyroscope is spinning, > is the top and bottom of the gyroscope spinning ... | |
| Angular momentum | 4/6/2010 |
| Q: i wondered about the coin. why is it possible? why isit when i roll a coin down a slope, it will not ... A: A coin does not fall to its side as it is spinning for the same reason a bicycle does not fall to ... | |
| Physics | 4/6/2010 |
| Q: remember me? it have been long since i wrote to you. i am now back to school and came across this. ... A: > is there a limit to the speed? In Newtonian mechanics, there is no limit to the THEORETICAL ... | |
| Resistance versus temperature | 4/6/2010 |
| Q: why the resistance of conductor increase with temperature A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Acceleration, gravity, and expanding Universe | 3/31/2010 |
| Q: I've seen many demonstations showing how the acceleration of a moving body can duplicate the effects ... A: > Is the a relationship between the accelerating expansion of the universe and gravity? I'm going ... | |
| Cleopatra making ice | 3/29/2010 |
| Q: how did Cleopatra kept herself cool in desert and how does she made ice ? A: > how did Cleopatra kept herself cool in desert First of all, if this is some kind of a joke, have ... | |
| physics | 3/27/2010 |
| Q: On youtube.com there are a few realistic examples of people using telekineses. Do you think those ... A: > Do you think those are real No. > or it is a real possibility? Until telekinesis can be ... | |
| Ionization | 3/27/2010 |
| Q: Atoms get ionized when radiation quanta knock off their electrons. Is the ionization mechanism the ... A: When an atom gets "ionized," it means one of its electrons gets knocked away from the attraction of ... | |
| Death by falling object | 3/25/2010 |
| Q: if you dropped a stainless steel piece of cutlery like a fork or a knife (not like a super shard ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| temprature | 3/22/2010 |
| Q: can we difine the temperature of vacuum?the temperature of single molecule? & is it true that the ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| What does it mean if the world is a hologram? | 3/21/2010 |
| Q: I read from a online article, that our world may be a Hologram, I got some question about it ... A: 4) What does "information" mean to a physicist? Permit me to answer this one first. This URL shows ... | |
| Space-time | 3/19/2010 |
| Q: I read from a online article, that our world may be a Hologram, I got some question about it ... A: > what is the space-time here referring to? > Does it mean "empty space"? For the purposes of this ... | |
| What does it mean if the world is a hologram? | 3/16/2010 |
| Q: I read from a online article, that our world may be a Hologram, I got some question about it ... A: > How do we know the information come from the surface? First of all, please understand that ... | |
| What does it mean if the world is a hologram? | 3/14/2010 |
| Q: I read from a online article, that our world may be a Hologram, I got some question about it ... A: First of all, there is something you MUST understand. Often, when scientists use a word that is also ... | |
| Loud speakers | 3/12/2010 |
| Q: I was just wondering if you could explain to me how speakers are able to reproduce the full spectrum ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| HUYGENS Principal | 3/5/2010 |
| Q: what is hygiene principle? explain refraction and reflection on its basis? A: If you do an internet search for Huygens principle you'll find, in a matter of seconds, URLs that ... | |
| Loss of magnetic field | 3/2/2010 |
| Q: Sir, I am aware that historically the earth's magnetic poles have changed polarity in the past. ... A: Here's my response to this question (and the original question itself) from about ten weeks ago.I've ... | |
| dp/dt | 2/28/2010 |
| Q: respected sir, The left -hand side of this equation for holes is dp/dt what is the physical ... A: I don't know which equation you are referring to, as holes in solid state physics have many ... | |
| General Physics | 2/26/2010 |
| Q: These are not homework questions....I got these doubts while revising my portion..I am in 12th 1) ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Stability of systems | 2/24/2010 |
| Q: respected sir , why are metastable states more stable than excited states A: Systems in our Universe -- whether they are bridges, crystalline structures, or a collection of ... | |
| understanding m-theory | 2/24/2010 |
| Q: I have four questions that are somewhat related. First, would you help me understand in an ... A: > what particles do the vibrating strings make? All of them -- that's why people find this paradigm ... | |
| understanding m-theory | 2/23/2010 |
| Q: I have four questions that are somewhat related. First, would you help me understand in an ... A: > how long the rolled up 2d membranes in m-theory According to ... | |
| Is expansion the result of spinning? | 2/23/2010 |
| Q: If after inflation, normal physics took hold could not the expansion of the universe simply be the ... A: No, because our Universe is NOT spinning around some center. Contrary to popular descriptions of the ... | |
| Higgs Boson | 2/13/2010 |
| Q: How Is it philosophically justifiable to say that there are fundamental particles in the universe ... A: > Higg's boson is supposedly that which gives mass Unfortunately, this statement is a bit of an ... | |
| Do elementary particles really exist? | 2/12/2010 |
| Q: How Is it philosophically justifiable to say that there are fundamental particles in the universe ... A: > How Is it philosophically justifiable to say that there are fundamental particles > in the ... | |
| Sound curing diseases | 1/30/2010 |
| Q: sir i would like to no how sound when of certain types can help to cure diseases....is there a ... A: If you could provide a link to a SCIENTIFIC study (and not just anecdotal, although that's how a lot ... | |
| "Purpose" of knowing momentum | 1/28/2010 |
| Q: What is the purpose of knowing momentum, like, what does it tell us? Say a car has a momentum of ... A: I'm not totally sure I understand what you mean by the "purpose" of knowing what momentum is. Like ... | |
| Electromagnetic waves | 1/26/2010 |
| Q: When we switch on or switch off an electrical contact, it gives sparking at the contact which ... A: The release of EM energy by a heated object is called (for historical reasons) "blackbody radiation ... | |
| magnetic motor | 1/25/2010 |
| Q: if over-unity is truly not possible explain to me how a bumblebee flies, how electrons continue to ... A: > how a bumblebee flies It flaps its wings. How it manages to do so AND remain in stable flight is ... | |
| inertia and centrifugal force | 1/21/2010 |
| Q: Force= mass *acceleration for uniform acceleration in circular motion we have centrifugal force.But ... A: > since acceleration is uniform force must be zero This is where you go wrong. If VELOCITY is ... | |
| Why right hand rule for magnetic field | 1/21/2010 |
| Q: As per electromagnetic principle, when electron (electric current) flows in a conductor a magnetic ... A: > the explanations in the book are more on the maths rather than concept Unfortunately, the ... | |
| Why right hand rule for magnetic field | 1/20/2010 |
| Q: As per electromagnetic principle, when electron (electric current) flows in a conductor a magnetic ... A: We use the "right hand rule" for one simple reason, and ONLY for one reason: it works. We could ... | |
| G-force | 1/17/2010 |
| Q: i have read some writings about unmanned aerial veichles which mention G-force effect.then i made a ... A: We experience "g-force" whenever we are in a vehicle that is CHANGING its velocity -- either by a ... | |
| skateboarding physics | 1/15/2010 |
| Q: can you show me a link for a good site for the physics of skateboarding A: I've never studied the topic, and I have no way of knowing which URL will meet your needs. But an ... | |
| Falling objects of unequal weight | 1/1/2010 |
| Q: I read in a book about WWII aerial bombing that American bombardiers were ordered to drop bomb loads ... A: > the bombs would fall at the same rate > the aircrews' worst fears were realized and the unequally ... | |
| Photons passing though glass | 12/28/2009 |
| Q: I just got interested in that matter as to how (on molecular level) photons pass though glass. And I ... A: > Is this really so? That is one of many things that can happen when light interacts with any kind ... | |
| Photons passing though glass | 12/27/2009 |
| Q: I just got interested in that matter as to how (on molecular level) photons pass though glass. And I ... A: When light interacts in ANY manner, it can be described either as an electromagnetic wave vibrating ... | |
| Effect of gravity | 12/26/2009 |
| Q: According to the laws of gravitation every body in the universe attracts every other body with ... A: > why doesn't the whole universe collapse on itself into a lump of dense matter? There exists in ... | |
| Concept of the | 12/22/2009 |
| Q: I am not a student. I like to know for my knowledge improvement. The query is as followed: While ... A: > the "field" is an entity that is predicted for sake of understanding certain natural phenomena ... | |
| reply to answer | 12/22/2009 |
| Q: if you were in as close to "zero" gravity as possible with a metal bat and hit an ordinary thin ... A: Friction is irrelevent to this question. The glass has a force on it, the glass can not hold ... | |
| Concept of the "Field" | 12/21/2009 |
| Q: I am not a student. I like to know for my knowledge improvement. The query is as followed: While ... A: When trying to understand and explain our Universe, in a manner that allows us to make useful ... | |
| What is the underlying 'force' | 12/18/2009 |
| Q: I am greatly please to see a website such as this. I am a wine maker and today noted that my ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| "zero" gravity/ "zero" resistance | 12/16/2009 |
| Q: if you were in as close to "zero" gravity as possible with a metal bat and hit an ordinary thin ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Banking of roads | 12/16/2009 |
| Q: Sir I've been trying to figure out a situation in banking of roads i.e. the first case in this link ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Loss of magnetic field | 12/13/2009 |
| Q: I've heard that over the eons the polarity of our globe has reversed a few times. When this happens ... A: When our Earth's magnetic field vanishes for a (geologically) short time (as it will eventually) at ... | |
| How many electrons? | 12/12/2009 |
| Q: electrostatics hello please tell me, during the accumulation of a surface electrostatic charge do ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| "Seeing" photons in a crystal structure | 12/12/2009 |
| Q: Why is glass transparent? I am a fairly intelligent 52 yr old techno geek, so you can give me a ... A: First of all, you can't see photons, and for a simple reason. To "see" an object means that light ... | |
| How was mass of Earth determined? | 12/10/2009 |
| Q: We all know that the mass of earth is 6 E 24 kg. But I want to know did scientists determine the ... A: This is easier than one would suppose. Recall that the size of the gravitational force F(g) for two ... | |
| Force on falling object | 12/10/2009 |
| Q: My question today has to do with the force associated with an object in motion hitting something. ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Transparent materials | 12/9/2009 |
| Q: Why is glass transparent? I am a fairly intelligent 52 yr old techno geek, so you can give me a ... A: First, a definition. "Transparent" (in physics) means electromagnetic (EM) radiation (ie, "light," ... | |
| Ice and wood friction | 12/8/2009 |
| Q: Which would go faster? A piece of ice sliding across a wood floor or a piece of wood sliding across ... A: You know, I really have no idea -- I've never given it any thought. However, it would make a ... | |
| Strong nuclear force | 12/8/2009 |
| Q: Nucleus in an atom consists of protons and neutrons. And like charges repel each other.So why don't ... A: There exists four fundamental forces in our Universe, with gravity and the electromagnetic force ... | |
| Terminal velocity without friction | 12/6/2009 |
| Q: After well over a half century out of physics classes, the formula escapes me but seems to have some ... A: > We may elect to ignore the friction factor > but that does not mean it does not exist Actually, ... | |
| Terminal velocity without friction | 12/5/2009 |
| Q: After well over a half century out of physics classes, the formula escapes me but seems to have some ... A: > You've told me nothing I didn't already know Since it's been "over half a century" since you had ... | |
| Weightlifting & Physics | 12/5/2009 |
| Q: I recently got into a disagreement with a friend over a weight room issue that has to do with ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Terminal velocity of dis-similar objects falling | 12/4/2009 |
| Q: After well over a half century out of physics classes, the formula escapes me but seems to have some ... A: Your memory is good, but not QUITE right. 33 feet per second per second is the acceleration by the ... | |
| Determining South Pole on a magnet | 12/2/2009 |
| Q: how do I find the south pole on a stick magnet? I have to have the south pole sticking out of a ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Air Visibility | 11/25/2009 |
| Q: I do not know if I am asking the right person or subject, but here it goes. Can air be seen? If so. ... A: > Can air be seen? Our atmosphere -- our "air" -- consists of many gases, mostly nitrogen and ... | |
| If the Earth were flat, what would happen at the South Pole? | 11/24/2009 |
| Q: in the past people did not know that the earth is round, they thought if they were to continue going ... A: I can't be certain exactly WHAT people thought would happen if you went "beyond" the edge of the ... | |
| Time dilation | 11/23/2009 |
| Q: i watched a documentary and it states that if we have two clock one in space and one on earth, the ... A: > will the person in space count faster then the one on earth? The short answer is "Yes." EVERY ... | |
| Scientific method | 11/23/2009 |
| Q: according to the rules of the quantum, when we observe (interact) with a particle, we change it, but ... A: > how we can much such as assumption? Such a leap. Recall how science works. Step 1) Create a ... | |
| Light and mass are both FORMS of energy | 11/22/2009 |
| Q: light has no mass, but it has energy and can be converted into other forms using solar panels. ... A: > does light has energy? The short answer is "Yes." There are many FORMS of energy -- light (an ... | |
| Time Dilation | 11/17/2009 |
| Q: What is the equation for time dilation and can you explain what each variable stands for? For ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Heat produced as "we" go closer to a planet's core | 11/16/2009 |
| Q: i watched a documentary show and it states that if we are on another planet, to avoid the cold, we ... A: As you go deeper into a planet -- whether that planet is solid or gaseous -- the weight of the ... | |
| outer space | 11/14/2009 |
| Q: i have read the link that you have given me. but i dont understand why vacuum is cold in space. wont ... A: > wont the sun be able to heat us up like how it heats the planets up? The main reason our Sun ... | |
| space | 11/14/2009 |
| Q: is space reali vacuum? i ask this question because i watched a documentary show and it says that the ... A: > is space reali vacuum? Not sure how you would define "really" a vacuum. Even the area between ... | |
| Sky at day and night | 11/13/2009 |
| Q: why in the day, the sky is blue even without clouds? i thought it should be dark like space. we are ... A: When the light from our Sun hits directly upon the atmosphere of our Earth, some of it is scattered ... | |
| GR based on the person IN the chest | 11/12/2009 |
| Q: Einstein states that if a person is in an enclosed spacious chest suspended in a uniform ... A: > we first look at the chest and the two rockets from the perspective > of someone in an inertial ... | |
| Changing state of matter | 11/12/2009 |
| Q: i heared that we are able to compress water to become solid. but can we sort of do the opposite ... A: > can we sort of do the opposite which is like pull the water to become gas? If liquid water is ... | |
| Quantum interaction | 11/12/2009 |
| Q: according to the rules of the quantum, when we observe (interact) with a particle, we change it, but ... A: What quantum physics assumes is that a system (let's say an electron) does not HAVE a specific state ... | |
| Dispersion of white light | 11/11/2009 |
| Q: when light travels through a prism, red light will be at the top when it exits and violet would be ... A: > am i right to say that red light is travelling at a faster speed then violet light? > am i right ... | |
| Why are planets round? | 11/11/2009 |
| Q: why is the earth round? even othe planets and moon is round, even the sun. is this a coincedence? ... A: You have wisely noted a pattern -- large objects tend to be round -- but have arrived at an ... | |
| white light | 11/10/2009 |
| Q: Hey, why does white light can be split into its different wavelengths by a prism? A: When a thin beam light goes from air to a thick solid (like glass) at an angle, it bends. When it ... | |
| Regards back to you | 11/10/2009 |
| Q: i hope you can understand, i hope that what i ask will not be a waste of time if you think that what ... A: Obviously your questions are not wasting my time -- I've given more time to them than to just about ... | |
| The problem with Earth's moon | 11/10/2009 |
| Q: firstly, i dont have an instructor and it is the holidays now therefore i do not go to school. i ... A: Okay, Cat/Burger, I will continue to answer your questions as best I can. Please understand that it ... | |
| vacuum | 11/9/2009 |
| Q: how do people make a room or a termal flask vacuum? when i want to remove air from a plastic bag, ... A: Cat/Burger, may I ask why you are asking so many questions, on so many unrelated topics? It would ... | |
| Writing on ice | 11/9/2009 |
| Q: is ice just special? ice is like other matter it is solid like metal or plastic but why cant i write ... A: In a sense, ice IS special. Remember what it IS -- solid water, and water can quite easily turn into ... | |
| Formation of our Moon | 11/9/2009 |
| Q: i heard that the moon was created by a huge comet that hit earth very long ago, causing the rock to ... A: > is this true? At this point in our understanding of our Earth and our Moon, this is the only ... | |
| Why is the core of the Earth so hot | 11/9/2009 |
| Q: why is it that after so long the core of the earth is so hot? i heard that jupiter is a gas planet, ... A: One of the greatest physicists of the 1800's, Lord Rayleigh, calculated that our Earth would have ... | |
| ozone depletion | 11/9/2009 |
| Q: we are now facing global warming, causing ozone depletion. theres just something i dont understand, ... A: > we are now facing global warming, causing ozone depletion You're confusing two atmospheric ... | |
| Reflecting light into a planet | 11/9/2009 |
| Q: i heared that the Sun gives out heat via the rays of light it emits, it is not possible to transfer ... A: Think about it -- the amount of sunlight that we could reflect onto a planet could never be larger ... | |
| Comets hitting the Earth | 11/8/2009 |
| Q: is the earth mass reali increasing? but why when comets strike they leave a crater, doesnt that mean ... A: > when comets strike they leave a crater, > doesnt that mean the land on earth is lost leaving a ... | |
| infrared telescopes | 11/8/2009 |
| Q: infrared can determind the temperature of something like if someone has fever or not. but can we ... A: Even if infrared (IR) telescopes had the resolving power of a telescope using visible light (which ... | |
| Hydrogen balloon in space | 11/8/2009 |
| Q: i am cat i want to ask this.in space,it is vacuum, means it has lower density then hydrogen, meaning ... A: > space,it is vacuum, means it has lower density then hydrogen That is correct > meaning if i put ... | |
| At the center of the Earth | 11/8/2009 |
| Q: when we stand on the north pole we would be standing upright and the same for the south pole but if ... A: This question has two possible answers: 1) it is irrelevent because, contrary to what Jules Verne ... | |
| sound | 11/7/2009 |
| Q: sound has mass, is sound solid,liquid or gas state? A: Once again, Burger, just like in your question about lightning, your first three words are false. ... | |
| Air Friction Force | 11/7/2009 |
| Q: This is not a homework question. I am trying to understand how the Air Friction Force affects a ... A: Your persistence in asking this question has convinced that, even if it WERE connected to academics ... | |
| time | 11/7/2009 |
| Q: is time a matter? does it have mass? when blackholes bring you back or front of time, will the ... A: Time, like heat or sound or charge or strangeness, is NOT an entity with or without mass. When I ... | |
| Time Dilation with acceleration | 11/6/2009 |
| Q: I'm not an expert, but am hoping for a bit of a reality check as to where I have gone wrong in ... A: Permit me to adjust the experiment EVER so slightly Clock A stays on the Earth. Clock B and Clock ... | |
| Time Dilation with acceleration | 11/6/2009 |
| Q: I'm not an expert, but am hoping for a bit of a reality check as to where I have gone wrong in ... A: What you described above is essentially correct. HOWEVER, you left something out: namely, ... | |
| Sound uses molecules | 11/6/2009 |
| Q: sound has no mass right? why cant it travel the same speed as light? A: Sound consists of organized vibrations of molecules -- ie, particles with mass. These vibrations ... | |
| Speed of light | 11/6/2009 |
| Q: light can travel slower in different medium but why not faster? A: The limit of light speed is its own speed in a vacuum. When it is different media (air, glass, ... | |
| What is energy | 11/5/2009 |
| Q: Everyday we talk about energy. The whole universe may be running by energy. However, we are not ... A: Trying to define "energy" is like trying to define "money." For an example of the problem, let's try ... | |
| Can we speed up light? | 11/5/2009 |
| Q: can light travel faster if we can push it or something? A: The short answer is "No." The long answer is, "No, because nothing we can do will make light go ... | |
| Asteroid hitting our Earth | 11/4/2009 |
| Q: there is no friction in space, and for example if we jump high on the moon, we would continue moving ... A: Actually, our Earth DOES move when it is hit by an asteroid -- just not very much. The reason is ... | |
| Hearing dinosaurs | 11/4/2009 |
| Q: if we go to to a faraway place maybe to another galaxy at the speed of light, i know that sound ... A: Three problems with this idea: 1) Sound can not travel without an atmosphere (or some other ... | |
| Locating an electron | 11/3/2009 |
| Q: Sir,i'm the student of Grade 11....! I've read that to locate an electron in a shell or in an atom, ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Quickest way to find an answer | 11/3/2009 |
| Q: If you take 1 kg of fresh water and add 35 g of salt (average for the oceans)will the volume ... A: Either you or I will have to do the following: 1) do an Internet search for density "sea water" ... | |
| Radiometric or radio isotope dating | 11/2/2009 |
| Q: I am trying to fathom out rock dating. No one seems to specify clearly what they mean by "1 - 2% ... A: Any time one specifies that a measured value of something is "X plus or minus y per cent," the "y%" ... | |
| speed | 11/1/2009 |
| Q: is it possible for us to travel faster than light? A: The simple answer is "No." The more complicated answer is also "No." Since we have mass, there is ... | |
| Can our eyes see Pluto? | 11/1/2009 |
| Q: facing pluto and we are able to zoom our eyes, can we see pluto? A: > can we see pluto? Even if we had the most powerful optical telescope in the world, zoomed its ... | |
| multiverse | 11/1/2009 |
| Q: I'm not sure this question went through, but I just finished reading Brian Green's book where he ... A: > where is the proof? There is none -- indeed, there's not even EVIDENCE. That's why it's called a ... | |
| "Change" in loudness | 10/30/2009 |
| Q: i want to ask this, when we hear a music from a mp3 player or something, with a earpiece pluged in, ... A: When your ear and brain work together to detect a sound, they detect what is above the background ... | |
| Pixels | 10/30/2009 |
| Q: does this means that when i use this camera to capture an image and from that image, i use the same ... A: This is more of an electronic engineering question than a physics question, but I'll answer it as ... | |
| Measuring the Steam Point | 10/19/2009 |
| Q: Why don't we put the thermometer inside the boiling water to check the steam point instead of ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Planck Black-body radiation | 10/14/2009 |
| Q: I have a friend with a masters degree in philosophy who keeps trying to get me to "explain" quantum ... A: > Namely, we now know for a fact that only questions that have "yes"/"no" answers are really > ... | |
| explaining post classical physics | 10/14/2009 |
| Q: I have a friend with a masters degree in philosophy who keeps trying to get me to "explain" quantum ... A: First, let me explain the two world views -- then let's make certain we agree what these two world ... | |
| Paradigms of our Universe | 10/13/2009 |
| Q: Does quantum theory give a picture of separate pieces to nature or something else? Regarding ... A: I don't fully the questions, so forgive me if I don't answer exactly what you're asking. Quantum ... | |
| Car Sound systems | 10/11/2009 |
| Q: Hey! I have just purchased a new car, and want to put a new sound system into it, i have been ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Cost of photo-voltaic energy | 10/9/2009 |
| Q: I read an answer given on the efficiency of the Hydrolysis of water to produce energy by burning ... A: > the solar panels would provide free limitless electricity This is the BIG flaw in your thesis. ... | |
| Drying clothes efficiently | 10/5/2009 |
| Q: This may or may not be your type of question, but I don't know any other field to submit it to. ... A: As best as I can tell after numerous searches, it won't make much difference either way. FAR more ... | |
| Magnetic strip having lost its words | 9/29/2009 |
| Q: I have a card at my school-much like a credit card-that I can use in my school store. The magnetic ... A: I find it incredible that you are not able to have a readable card re-issued, even if you are ... | |
| pulleys | 9/26/2009 |
| Q: does a massless pulley mean a pulley with 0 mass(which is impossible)? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Lux at separate distances | 9/26/2009 |
| Q: I don't know if this falls under your expertise, but I'll give it a shot anyway. My problem is: ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| can an anti particle be trapped for ever? | 9/24/2009 |
| Q: it seems that you don't even have a name on your profile, which is interesting. i would just like to ... A: > it seems that you don't even have a name on your profile, which is interesting I'm not certain ... | |
| Why doesn't water in clouds freeze? | 9/24/2009 |
| Q: when we are on a plane at a high point, the outisde temperature is below 0 degree celcius, but why ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Detecting alpha particles | 9/23/2009 |
| Q: I understand that photodiodes can be used to evaluate radon levels and are used in some monitors. ... A: > I remember reading somewhere that when the geiger counter was first produced, > it was able to ... | |
| Detecting alpha particles | 9/22/2009 |
| Q: I understand that photodiodes can be used to evaluate radon levels and are used in some monitors. ... A: > I'm interested in understanding the wavelength of the 'light' emitted from the alpha decay There ... | |
| Interference patterns | 9/19/2009 |
| Q: a diffraction pattern is obtained by interference of waves from the secondary wavelets of incident ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Does our Universe require "locality"? | 9/14/2009 |
| Q: its not a homework question, I graduated college a long time ago, I am however reading a book on ... A: > lets say the size of a shoe box, then ok, > one electron is effecting the other somehow and we ... | |
| WHY does observation change things? | 9/12/2009 |
| Q: its not a homework question, I graduated college a long time ago, I am however reading a book on ... A: > Why would obervation or interaction, change a particle's behavoir? You pick up on a very ... | |
| Being blasted into atoms, yet remaining a person | 9/7/2009 |
| Q: I’m betting this may be one of the weirder questions you’ll get today. There is, however, method to ... A: The wierdest questions aren't the ones like yours -- they're the ones whose question I can't even ... | |
| Copenhagen Interpretation | 9/7/2009 |
| Q: I'm reading a book by Paul Davies and just want to clear something. I understand the rules of ... A: > until we open the box and look, the wave is in both chambers Bizarre as it may sound, that IS the ... | |
| Falling cats and AM | 9/4/2009 |
| Q: Cats have nine lives Folks claim that “cats have nine lives” because when they are thrown at a ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Tachyons MIGHT exist | 9/3/2009 |
| Q: I asked a question about massless particles. I have just one more question to clear this up for me. ... A: > why does anyone think that tachyons exist? You see why tachyons can not carry information. ... | |
| Particles going faster than SoL | 8/28/2009 |
| Q: I asked a question about massless particles. I have just one more question to clear this up for me. ... A: > Why wouldn't a massless particle, or a message, be able to exceed the speed of light? The problem ... | |
| Faster than light photon | 8/28/2009 |
| Q: are there particles that contain no mass (have we proven that or is it just theory). I'm asking ... A: > Could a photon, if it has no mass, therefore exceed the speed of light? > Would there be a ... | |
| Within the nucleus | 8/27/2009 |
| Q: Is there space between the protons and neutrons in the nucleolus? If so,and hypothetically if we ... A: > Is there space between the protons and neutrons in the nucleolus? First a definition: protons and ... | |
| How a battery works | 8/27/2009 |
| Q: I hope my inter-related questions will be interesting enough to justify their length. If, say, a ... A: I'm not certain I follow what objection you are raising, but let me just repeat an explanation of ... | |
| Particles with no mass | 8/27/2009 |
| Q: are there particles that contain no mass (have we proven that or is it just theory). I'm asking ... A: > are there particles that contain no mass > have we proven that or is it just theory Photons -- ... | |
| Why you can't get to the speed of light | 8/20/2009 |
| Q: Hey there! I have searched the internet about my question and all the answers seem to be the same... ... A: > Doesn't light have mass too? No. The mass of a photon (the smallest "chunk" of light) is zero. At ... | |
| Going CLOSE to the SoL | 8/19/2009 |
| Q: Hey there! I have searched the internet about my question and all the answers seem to be the same... ... A: First of all, you are an observor with mass. Thus, it is absolutely impossible for you to travel AT ... | |
| Breathing at terminal velocity | 8/11/2009 |
| Q: A human free fallilng can reach terminal velocity in excess of 130mph.How do they breathe wil air ... A: Air rushing past someone at that speed would indeed be at such a low pressure that it would be ... | |
| You'll have to rephrase your question | 8/8/2009 |
| Q: Do any light or sound or other wavelength have density? A compressed air stream does and I was ... A: > Do any light or sound or other wavelength have density? The word "density" means "amount of ... | |
| Temperature required for fusion | 8/7/2009 |
| Q: Why must the temperature be higher to fuse two Helium nuclei than to fuse two Hydrogen nuclei ? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Size of gravitational force | 8/7/2009 |
| Q: Why is the gravitational force of attraction between the two bodies of ordinary masses not ... A: Two ways you can figure this out 1) Do a calculation of the size of the gravitational force between ... | |
| Multiple sounds in the same space. | 8/7/2009 |
| Q: I'm having trouble wrapping my brain around how multiple distinct sounds (pressure waves might be a ... A: If you want a better example than a person in a room with three conversations, imagine a concert ... | |
| uncertainty and light | 8/4/2009 |
| Q: We know that by the De broglie's theorem, the momentum of a light photon traveling at the speed of ... A: > Since we know the exact momentum of a photon This is the flaw. We DON'T know a photon's exact ... | |
| Einstein's Postulates | 8/3/2009 |
| Q: I saw a few shows on tv and is now puzzled by the time warping proposed by Einstein's theory of ... A: You ask a good question. I regret that my answer (1) will require a little bit of introduction and ... | |
| Total energy of our Earth | 8/1/2009 |
| Q: It is known that energy cannot be created or destroyed but converted from one form to another. Thus, ... A: The Earth has been receiving light (ie, electromagnetic) energy from our Sun for a few billion ... | |
| Energy balance in chemical bonds | 7/30/2009 |
| Q: when an electron add in an atom , energy is released......this energy is released because when the ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Einstein's education | 7/19/2009 |
| Q: Did Albert Einstein graduate from elementary school (or the equivalent)? Did he graduate from high ... A: According to http://en.wikipedia.org/wiki/Albert_Einstein#Early_life_and_education Einstein had a ... | |
| Conversion of units of power | 7/17/2009 |
| Q: Our firm is marketing Micro Gasification Systems utilizing Wood Bio Mass in the United States and I ... A: > Can you translate I presume you want a coversion factor between kilocalories per hour and some ... | |
| Effects of helium on sound | 7/17/2009 |
| Q: A coworker and I have been discussing helium and its effect on the sound of the human voice, and he ... A: What I thought would be a pretty straitforward explanation turned out to be much more complicated. ... | |
| Energy and Sound | 7/16/2009 |
| Q: I'm curious if there is a simple explanation for or against an idea that I've been thinking about. ... A: > Is all matter fundamentally energy? Matter is a FORM of energy. In that sense it is equivalent to ... | |
| Here's how I imagine it | 6/24/2009 |
| Q: Polarized oscillates in one direction..I can picture that in my mind.Unpolarized light oscillates in ... A: If this image doesn't help you, then I can offer no further help -- it's the best I can do. Anyway, ... | |
| Bicycle and angular momentum | 6/21/2009 |
| Q: Why a bicycle or a motorbike won't fall off when riding? While the bicycle in rest, it falls down. ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Increase of mass from asteroid of 65 million years ago | 6/19/2009 |
| Q: There is a new TV show that deals with a piece of neutron star that hits the moon and doubles its ... A: The mass of that asteroid was an estimated 6 x 10^14 kg, www.icr.org/article/453 which sound like a ... | |
| Einstein as told by TV | 6/18/2009 |
| Q: I recently saw a program describing the eclipse of the sun that allowed scientists to prove that the ... A: > If the sun were not there, > would the bending light have traveled in a different direction? I ... | |
| Doubling the mass of our Moon without destroying it | 6/17/2009 |
| Q: There is a new TV show that deals with a piece of neutron star that hits the moon and doubles its ... A: Any object that, when hitting our Moon, would double its mass would have to be the same mass of our ... | |
| Average size | 6/16/2009 |
| Q: What is the average penis size? A: Not sure why you're asking this on a physics forum. However, these scientific studies should be a ... | |
| Follow-up | 6/16/2009 |
| Q: When it is said that all falling bodies fall at the same acceleration to the earth, does that hold ... A: > the earth is pulled towards those different mass objects at different rates That is correct. ... | |
| Why is acceleration on Earth's surface the same | 6/16/2009 |
| Q: When it is said that all falling bodies fall at the same acceleration to the earth, does that hold ... A: > does that hold true only because compared to the size of the earth, > all falling bodies have the ... | |
| Quantum physics in a simple manner | 6/10/2009 |
| Q: What is quantam physics...how can we make a lay man understand the concept in a simple manner. A: > how can we make a lay man understand the concept in a simple manner? The answer is pretty ... | |
| electric magnet fields | 6/3/2009 |
| Q: I was wondering if matter close to absolute zero slows down atomic decay and neutrinos lose ... A: > matter close to absolute zero slows down atomic decay As far as we know, nothing alters the rate ... | |
| Obtaining optical equipment | 5/31/2009 |
| Q: Do you know of a device that will take a laser beam from a laser pointer and either divide it into ... A: A quick internet search for "beam splitter" found this company selling optical equipment that may or ... | |
| Atomic structure | 5/31/2009 |
| Q: Sir,,i am a new to atomic physics and have many queries in my mind.......i was recently studying ... A: 1) I presume your question is "Can a substance be made to emit line spectra just by heating it, or ... | |
| electric current and electric field | 5/31/2009 |
| Q: the voltage drop is equal to integration of electric field into dr. if the electric field is the ... A: I believe you are confusing two concepts: electric current and electric field (aka 'E-field'). The ... | |
| I'll tell you what I'll know | 5/31/2009 |
| Q: I came across the following in a physics forum---is it true? I'm paraphrasing a little from the ... A: Here's what I *do* know. Imagine three observors of a star '*', all the same distance from that ... | |
| Angular size while travelling at near-light speed | 5/30/2009 |
| Q: I came across the following in a physics forum---is it true? I'm paraphrasing a little from the ... A: Before I check the accuracy of what this person is saying, I'd have to see his complete statement. ... | |
| You CONTINUE to confuse time dilation with simultaneity | 5/29/2009 |
| Q: In the train-and-platform thought experiment ... A: Let me state this as clearly as I can. When two observors are moving in constant velocity relative ... | |
| "The" successful experiment calculating light speed | 5/28/2009 |
| Q: i have a question that who did the successful experiment of calculating the speed of the light? i ... A: > who did the successful experiment of calculating > the speed of the light? Not sure what you ... | |
| Don't confuse time dilation with simultaneity | 5/28/2009 |
| Q: In the train-and-platform thought experiment ... A: > an observer on the station will see a clock at the back of the train > moving faster than a clock ... | |
| Capacitor in DC circuit | 5/27/2009 |
| Q: when a capacitor is connected with battery why each plate recieve charge of equal magnitude and is ... A: I'm not sure I understand your question, but I'll repeat what I've already said: 1) there is no ... | |
| Oscillating EM-field or oscillating space | 5/27/2009 |
| Q: I am reading a book by Isaac Asimov on Maxwells Eqns."It is possible to view the oscillating field ... A: I wish I could say, "It's all very simple." But the fact is, it isn't. Indeed, without Asimov's book ... | |
| Capacitor in DC circuit | 5/26/2009 |
| Q: when a capacitor is connected with battery why each plate recieve charge of equal magnitude and is ... A: With a DC circuit, there is no electromotive force (ie, no voltage) outside of the circuit. This ... | |
| How lasers work | 5/22/2009 |
| Q: I am interested in designing a low frequency radio wave device that can produce a coherent beam of ... A: Every laser ever designed and built works on the same principle: get more atoms in a specific high ... | |
| Measuring speed anywhere | 5/21/2009 |
| Q: Measuring the speed of an object is fairly straightforward on or near Earth. We know a spaceship is ... A: Your question seems to be, "How can I measure an object's uniform speed when I have nothing to ... | |
| Capacitor in DC circuit | 5/21/2009 |
| Q: when a capacitor is connected with battery why each plate recieve charge of equal magnitude and is ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Movement of Air | 5/20/2009 |
| Q: Does the air inside of a tire spin at the same speed as the tire itself?? When the tire stops does ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| A possible cause of your problem with PN junctions | 5/18/2009 |
| Q: It would be most helpful if you could explain to me how a PN junction diode really works. I already ... A: > which seems quite unreasonable because, > as we know it is the negative charge that moves, > not ... | |
| Solidifying liquid water through pressure | 5/18/2009 |
| Q: I am not a physics expert or a physics major but I would like to ask you these questions. Ice is ... A: > Can water turn to ice if it is placed in a compression chamber Although I'm not 100% certain, I ... | |
| Size of our Universe | 5/16/2009 |
| Q: I have seen recently scientists claim they have seen objects (using hubble) 13 billion lightyears ... A: > where am i going wrong? Most likely in your assumption that our entire Universe is finite, and ... | |
| Expanding Universe, with expansion actually expanding | 5/16/2009 |
| Q: My understanding is that current knowledge leads us to believe the universe is expanding at an ... A: Let's go back to the meaning of cosmic expansion. I'll explain it again as similar to a balloon ... | |
| Expanding Universe, with expansion actually expanding | 5/16/2009 |
| Q: My understanding is that current knowledge leads us to believe the universe is expanding at an ... A: I'm quite impressed. You surmised the reason for the red-shift of distant light sources, a phenomena ... | |
| TOTAL weight of tub, water, and person | 5/7/2009 |
| Q: My friends and I are arguing this at work...If a hot tub is sitting on a scale with water in it, and ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Lever forces | 5/7/2009 |
| Q: I am having an argument with a puzzle publisher....please look at this picture. ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Quantum physics | 5/4/2009 |
| Q: I'm I'm 13 years old in seventh grade. I'm very intersected in the law of attraction, and i was told ... A: Before I can even attempt an answer to your question, I need to know two things: 1) What exactly is ... | |
| A common question -- and a good one! | 4/28/2009 |
| Q: My son asked me this: If the speed of light can not be surpassed then if you were travelling on a ... A: Permit me to rephrase it. Say you are on a space ship going 90% of the speed of light (ie, .9c) ... | |
| Mass into energy | 4/22/2009 |
| Q: please explain under what conditons mass is converted into Energy? A: The most common instance is during nuclear reactions. For instance, when a U-235 nucleus has a ... | |
| Air resistance | 4/10/2009 |
| Q: What does it mean by air resistance? Does it slow objects moving through air? Please give me the ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| What a computer stores | 4/6/2009 |
| Q: I know i am asking a stupid question but it has stuck my mind so i am asking to you that When i ... A: Each computer has a small amount of information about itself (time, preferred disks, what to do at ... | |
| Calculating refractive index | 4/1/2009 |
| Q: If velocity of light=frequency * wavelength then the light coming from sunlight is made of ... A: I regret that I do not fully understand the question. There are innumerable ways to measure the ... | |
| Cosmic background radiation | 3/31/2009 |
| Q: I have heard that some of the static/whitenoise heard on a radio receiver is in fact remnant from ... A: First of all, a MINOR correction. Cosmic background radiation, also known as the cosmic microwave ... | |
| Wavelength, frequency, and speed | 3/29/2009 |
| Q: If velocity of light=frequency * wavelength then the light coming from sunlight is made of ... A: The speed of light (indeed, of all electromagnetic radiation) is the same. Thus, if you multiply the ... | |
| Calculating a B-field | 3/29/2009 |
| Q: Ampere's law and Biot-Savart law of induction ueses a steady (no variation with time)constant ... A: Both Ampere's Law and the Biot-Savart Law presume that the current from which we are calculating the ... | |
| Pull on one end of a cable | 3/18/2009 |
| Q: If there was a straight taught cable, string, or wire that was 5 light-years long (not that it is ... A: The signal from one end of the wire -- the signal saying, "I'm being pulled -- follow along with ... | |
| How fast before we lose ability to see it? | 3/16/2009 |
| Q: I think that the velocity at which a small object such as a bullet travels is too fast for a human ... A: You've asked a very good question, one that I (1) think should be analyzed better than what I have ... | |
| Questions I answer | 3/15/2009 |
| Q: what kinds to physics questions do you answer if not school based physics A: Believe it or not, some people maintain an interest in physics -- along with interest in learning in ... | |
| Resistance | 3/14/2009 |
| Q: Respected sir please let me out of this problem: Do bends in wire effect electrisal risitance? If ... A: :^) I don't know how "respected" I am, but I will answer your question. However, please forgive the ... | |
| Dopper Shift | 3/12/2009 |
| Q: An observer who is passed by a rapidly-moving cart equipped with a blaring tone generator will hear ... A: Let me (1) explain the doppler shift and (2) ensure that I understand your question. Imagine an ... | |
| Dopper Shift | 3/7/2009 |
| Q: An observer who is passed by a rapidly-moving cart equipped with a blaring tone generator will hear ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| head on collision | 3/7/2009 |
| Q: i would like to know where i could find this information. 2 cars head on collision going say 60mph ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Measuring pulse rate | 2/25/2009 |
| Q: Cna you measure your pulse rate? A: It's pretty straitforward. Just put your finger or hand on a place -- your wrist, your neck, your ... | |
| I'm still confused | 2/16/2009 |
| Q: Please can you identify for me some liquids, when frozen, are heavier than water. ANSWER: A "frozen ... A: You apparently understand the following: 1) most substances, when they solidify, INCREASE their ... | |
| Solids heavier than water | 2/16/2009 |
| Q: Please can you identify for me some liquids, when frozen, are heavier than water. A: A "frozen liquid" is just another word for "solid." Just about any solid that will sink in liquid ... | |
| Bubbles form in liquid when adding a solid | 2/11/2009 |
| Q: Sometimes when I make hot tea, the water re-boils when I drop in the tea bag. I heat water to a full ... A: What happens when bubbles form in a liquid? Basically, the internal gas pressure overwhelms the ... | |
| Induced E-fields | 2/11/2009 |
| Q: Once again thank you for the clarifications.I can now understand that a changing B field next to a ... A: > if I connect the wire in a closed circuit with an ammeter, > will it register a reading? Yes. ... | |
| LEDs | 2/11/2009 |
| Q: If light is produced when electrons move from higher energy orbits to lower energy orbits, when does ... A: I must admit that I am confused about what exactly you want to know. Which of the following do you ... | |
| Charged particles | 2/9/2009 |
| Q: How do caheged particles lose their charge? Is it possible to place charged particles in a container ... A: > How do caheged particles lose their charge? Individual particles never lose their charge. ... | |
| The limitation of incandescent bulbs | 2/8/2009 |
| Q: If light is produced when electrons move from higher energy orbits to lower energy orbits, when does ... A: The main limitation of an incandescent bulb is that it has a moving part. Feel free to respond, ... | |
| LED"s | 2/8/2009 |
| Q: If light is produced when electrons move from higher energy orbits to lower energy orbits, when does ... A: Each individual atom emits a photon (ie, a chunk of light) when any of that atom's electrons goes ... | |
| Some of the "basic" laws of physics | 2/8/2009 |
| Q: i was wondering if you could perhaps tell me what the mian "laws" of physics or energies are....i ... A: Your question IS a bit vague, but I'll try to answer it in this way. What laws of our Universe are ... | |
| Induced Current | 2/5/2009 |
| Q: I have a few points that needs further clarification. 1)I learned in school that a battery is a ... A: 1) an "induced EMF" is Faraday's description for loops of conductor within a changing B-field ... | |
| Changing B-field near a conductor | 2/2/2009 |
| Q: As a follow up question;If instead of a conductor (wire)I now have a conducting surface say a metal ... A: Anytime a changing B-field (more precisely, a changing magnetic flux) goes through a conductor -- ... | |
| electric Flux and gaussian surface | 1/31/2009 |
| Q: considering a volume charge distribution....if we consider the Gaussian surface such that it does ... A: Although I don't completely understand what you are asking, I'll try to answer it. I've not used the ... | |
| Temperature measured by a thermometer | 1/30/2009 |
| Q: Would it be true to say that a thermometer measures its own temperature, and not that which it is ... A: Any useful thermometer quickly reaches temperature equilibrium with the environment into which it is ... | |
| Why we continue to "see" things | 1/30/2009 |
| Q: I am not sure if my last questions were sent, so here they are again. 1. Why do we see the wheels ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| AC current placed near current carrying loop | 1/29/2009 |
| Q: Let me rephrase the question thus:There is a DC current flowing in a wire,therefore there is a B ... A: Let's assume the wire carrying the constant current is part of a loop of conductor. That loop of ... | |
| The atom | 1/28/2009 |
| Q: Newtons law on motion states that "To every action there is an equal and opposite reaction" Let us ... A: > I understand that an atom is the smallest part of an object Not QUITE correct. The atom is the ... | |
| Self-powered cart on treadmill that tilts | 1/28/2009 |
| Q: If I walk I use energy to do work. If I climb stairs, I gain height and so use energy to lift my ... A: The diagram helped quite considerably. I'll answer the question x is the amount of energy needed ... | |
| Collisions | 1/27/2009 |
| Q: Newtons law on motion states that "To every action there is an equal and opposite reaction" Let us ... A: Newton's Third Law applies in collisions only to this extent: the force exerted by the cue ball on ... | |
| Speed/Velocity | 1/27/2009 |
| Q: A dictionary explains that speed and velocity mean "Distance traveled per unit time". Is it not true ... A: > Is it not true that velocity has to include direction That is correct. > Also is it at the point ... | |
| Treadmill with motor with negligible losses | 1/27/2009 |
| Q: If I walk I use energy to do work. If I climb stairs, I gain height and so use energy to lift my ... A: Okay, let's take the motor of your treadmill, drawing current (and thus energy) as it keeps the ... | |
| Electro-magnetism | 1/25/2009 |
| Q: .it cleared up a lot for me. Can you help me understand this sentance..The field inside a conductor ... A: > The field inside a conductor stays inside > and outside fields stays outside I'm afraid I can't ... | |
| Definition of "work" in physics | 1/23/2009 |
| Q: I am doing chin ups.I lift myself uo till my chin is above the bar,thus work was done to raise my ... A: The problem arises when scientists use a word like "work" -- that has innumerable meanings in ... | |
| Relationship between B-fields and currents | 1/21/2009 |
| Q: A DC current is flowing in a wire,a steady,time invariant magnetic field surrounds/circles it..right ... A: You correctly note the following: 1) a non-changing current through a wire creates a non-changing ... | |
| Pipes freezing, hot and cold pipes | 1/18/2009 |
| Q: if i shoot a rifle(sks,7.62bullet)perfectly straight up in the air will the bullet come back in the ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Reduced temperature upon opening a bottle | 1/17/2009 |
| Q: why does a chilled bottle of tea freeze when opened A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Measuring the loss of heat over time | 1/15/2009 |
| Q: I live in a senior housing complex. My ground floor apt heaters are 10-15 years old. How can any ... A: Not sure exactly what you're looking for, but the only thing I can think of is to place a few ... | |
| The effect of an impossible event | 1/12/2009 |
| Q: sir what will happen when earth stops its rotation? ANSWER: If you check out these two URLs ... A: Due to its rotation, the surface of our Earth at the equator is moving (relative to our Sun) at over ... | |
| Work done by friction force | 1/11/2009 |
| Q: Is any type of work is done by friction?If so,then what type? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Earth's rotation | 1/10/2009 |
| Q: sir what will happen when earth stops its rotation? A: If you check out these two URLs www.badastronomy.com/bad/misc/tides.html ... | |
| What about velocities above c? | 1/10/2009 |
| Q: I recently learned about the theory of relativity in my grade twelve class but there were two things ... A: > If you square a velocity that is greater or equal to the speed of light Fortunately, that is a ... | |
| Object struck at its focal point | 1/9/2009 |
| Q: I've been pondering this for a long time. If you strike an object at it's focal point will it not ... A: Not sure what you mean by "focal point" of an object, as that term is usually applied to optics. ... | |
| Number of miles in a light-year | 1/9/2009 |
| Q: if i shoot a rifle(sks,7.62bullet)perfectly straight up in the air will the bullet come back in the ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Theory of Relativity Extremes | 1/8/2009 |
| Q: I recently learned about the theory of relativity in my grade twelve class but there were two things ... A: > if the faster you travel the shorter you become > what happens when you meet or go less then ... | |
| How do piezo crystals work | 1/5/2009 |
| Q: Sir could you please explain how a piezoelectric crystal work. I mean what mechanism leads to the ... A: This PowerPoint file is the best explanation I could find: www.ndt-ed.org/EducationResources ... | |
| Induced voltage by changing B-field | 1/1/2009 |
| Q: Faraday showed that current is induced in a coil by a moving magnet.What causes this effect? Thanks A: More precisely, Faraday showed that a voltage was induced within a loop in which the B-field was ... | |
| speed and velocity | 12/21/2008 |
| Q: What is the difference between speed and velocity ?? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Inversion during EM wave reflection | 12/21/2008 |
| Q: ) When a wave,(light) moves from a less dense medium (air) and reflects off a more dense ... A: I was not able to find a simple way to explain this phase shift of the E-field upon reflection, ... | |
| single molecule data | 12/18/2008 |
| Q: What is the minimum number of molecules required in a given sample space/volume in order to make ... A: Let's make certain we agree on definitions: Phase -- how molecules interact with each other. ... | |
| Why don't spinning objects fall down? | 12/16/2008 |
| Q: Bodies that are rotating (like a top) or the ones that are moving (like a bicycle) are easily ... A: In our Universe there is a quantity called "angular momentum," which is very similar to linear ... | |
| Where does potential energy go? | 12/15/2008 |
| Q: I have a problem and I can not solve it. We have a simple spring.We compress it and fix the current ... A: > This is wrong, because this must be also caused when we put > a non-compressed spring in the acid ... | |
| When someone is "coasting" | 12/13/2008 |
| Q: Can you explain how accelerating an object can 'break' time as compared to what I somewhat ... A: Your term "coasting" is acceptable, but permit me to use it as shorthand for the words "travelling ... | |
| Where does excess charge go? | 12/13/2008 |
| Q: I have a follow up question,if the electrons from the metal flow to neutralise the positive charges ... A: Good question. Note that it doesn't take a lot of charge BUILDUP to make a nasty spark. When you ... | |
| Buoyancy | 12/11/2008 |
| Q: The following is not a homework question. It is 50 years since I did physics and I was trying to ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| To calculate the gravitation acceleration on ANY object | 12/9/2008 |
| Q: I am wondering what the exact gravitational acceleration on the moon is. I was taught that it is 1.6 ... A: If you are measuring the gravitational acceleration a(Gr) on the surface of any spherical object, ... | |
| Gravity and other forces | 12/9/2008 |
| Q: My name is Rob. I am not a student but I was hoping you could help improve my understanding of the ... A: > In what ways is it different? Several ways: 1) There is no repulsive gravitational force. 2) ... | |
| The nature of electrostatic "ground" | 12/8/2008 |
| Q: I was pushing a baggage trolly in the airport(aircon)and i was wearing rubber shoes,i pushed on the ... A: In the parlance of electricians, there are two meanings of the word ground: "local" and "true." The ... | |
| Gravitational Force | 12/8/2008 |
| Q: My name is Rob. I am not a student but I was hoping you could help improve my understanding of the ... A: There IS a gravitational attraction between the orange and the bowling ball in outer space. Indeed, ... | |
| Voltage detector | 12/5/2008 |
| Q: How does a voltage detector test pen work? I put on thick rubber soles and use a test pen to see if ... A: I presume you're asking about something like this ... | |
| double slit experiment | 12/4/2008 |
| Q: a)I checked out a site recommended for the double slit experiment..its very good!If an obsrevation ... A: A) In the experiment you mention, electrons are sent, one at a time, through one of two slits, and ... | |
| Iron filings in a magnetic field | 11/28/2008 |
| Q: suppose there is bar magnet kept on a cardboardand it has a magnetic field around it... suppose we ... A: If any object made of a ferro-magnetic material (such as iron) is within any type of magnetic field, ... | |
| distributive weight | 11/26/2008 |
| Q: If you have two objects that can each support 500lbs of weight, does that necessarily mean that they ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| How can one cell become two? | 11/26/2008 |
| Q: We know 2+2 is 4, but can physics present a working model as to how a cell upon cenception becomes ... A: > can physics present a working model as to how a cell upon cenception becomes two > how can matter ... | |
| Do I answer questions onTheoretical Physics? | 11/24/2008 |
| Q: I would like to know if you answer theoretical physic questions? Best regards, Julian A: I'm willing to try. If it's related to academic or professional work, don't waste your time (as I ... | |
| Solids and liquids | 11/23/2008 |
| Q: I wanted to ask that why we are able to penetrate(go into) water or any other fluid. When we stand ... A: The reason we (solids) can go into fluids (like water) but not into other solids has to do with how ... | |
| Why Cheerios(R) attract (just a guess) | 11/21/2008 |
| Q: I have observed an odd behavior of the breakfast cereal Cheerios when there are only a handful (say ... A: Disclaimer -- the following is ONLY a guess, and it is the only guess I can think of at this time. ... | |
| Light bulb resistance when voltage polarity changes | 11/21/2008 |
| Q: I have been trying to know if the resistance of a light bulb changes when the polarity of the ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Nature of voltage and current | 11/18/2008 |
| Q: I am a bit confused about the relation b/w power, voltage and current as we know ... A: > Electric potential at a point is the amount of work needed > to be done to bring a unit charge ... | |
| Nature of voltage and current | 11/17/2008 |
| Q: I am a bit confused about the relation b/w power, voltage and current as we know ... A: PART I > when we increase the voltage, the current should also increase That would be true ONLY if ... | |
| newton's third law of motion | 11/17/2008 |
| Q: i am always confused about this law((action====reaction)) Is there any situation in which when the ... A: When talking about a force, you MUST carefully specify two things: 1) BY WHAT is the force coming ... | |
| The "why" of magnetism | 11/12/2008 |
| Q: i have just studied electromagnetism(X standard), but i exactly do not know why certain (or rather ... A: > what causes magnetism?? what is it? First of all, understand that we live in a universe in which ... | |
| fish in tank of water | 11/12/2008 |
| Q: if i shoot a rifle(sks,7.62bullet)perfectly straight up in the air will the bullet come back in the ... A: Think of the situation this way. You have two buckets, one with water, one with fish only (they are ... | |
| You are not an idiot | 11/9/2008 |
| Q: Physic is my favorite subject.But the problem is that no matter how hard I study, my grade still ... A: > Am I an idiot? No. Physics is quite a difficult subject, particularly when the only way to fully ... | |
| Change in melting point due to impurities | 11/8/2008 |
| Q: in my book it is written that the addition of impurities lowers the melting point of a substance..i ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Twin Paradox and Common Sense | 10/28/2008 |
| Q: I understand that someone traveling at close to the speed of light in a spaceship would in a sense ... A: > my question rather was about (not from a mathematical formula > but from common sense) why such a ... | |
| Again, KEEP TRACK of what's exerting what force on what | 10/27/2008 |
| Q: QUES--suppose a box is lying on ground with mass m so it will exert a force of mg on earth and the ... A: > when the box and the earth are in contact, > does earth exert a force of mg on box(gravitational) ... | |
| Twin Paradox | 10/27/2008 |
| Q: I understand that someone traveling at close to the speed of light in a spaceship would in a sense ... A: > what reasoning did einstein use to determine [this] Remember my opening disclaimer? I'll do my ... | |
| Why does the curvature seem so pronounced | 10/26/2008 |
| Q: http://tiny.cc/5FCPZ is this photo telling me the truth about the curvature of the earth? or is it ... A: First and foremost, I don't know where the picture was taken or with what lens. So I'm just guessing ... | |
| Twin Paradox | 10/26/2008 |
| Q: I understand that someone traveling at close to the speed of light in a spaceship would in a sense ... A: > please explain in laymen words An apocryphal story has Einstein being asked to explain relativity ... | |
| Is this telling the "truth" about the Earth's curvature | 10/25/2008 |
| Q: http://tiny.cc/5FCPZ is this photo telling me the truth about the curvature of the earth? or is it ... A: Not certain what truth you think this photo is (or is not) showing. The Earth's surface is curved. I ... | |
| Keep track of all forces -- BY what and ON what | 10/23/2008 |
| Q: suppose a box is lying on ground with mass m so it will exert a force of mg on earth and the earth ... A: I admit, this gets a bit confusing. It's like two people who agree to split every expense 50-50, and ... | |
| Why I won't answer questions about eggs | 10/21/2008 |
| Q: Why do you hate the word "egg"? Are you allergic to it!. A: most questioners over the last five years either don't bother to do so or don't understand what I am ... | |
| Why is it colder at higher temperatures | 10/20/2008 |
| Q: i was just wondering if heat rises why is it cold at the top of a mountain A: Imagine, if you will, asphalt that's been out in the sun for a few hours. Hold your hand a couple of ... | |
| Light and sound | 10/14/2008 |
| Q: How does light and sound travel through gases? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Importance of Electric Field | 10/7/2008 |
| Q: What is the importance/relevance to know the electric field distribution of a electrical apparatus? ... A: The electric field around any apparatus tells us how charges will react if near that apparatus. Too ... | |
| Photons are NOT observors | 10/6/2008 |
| Q: According to Special Relativity, the lenght of and object outside of my frame contracts in the ... A: In our universe "distance" only has meaning as a measurement between two measuring devices. Again, ... | |
| Bending of kite lines | 10/5/2008 |
| Q: We have all flown kites in our childhoods. I wonder why when the kite reaches a good altitude, its ... A: The lines bend down because they have weight. They are pulled in two directions -- downward because ... | |
| Effects of relativistic speed | 10/4/2008 |
| Q: Is the mass increase and length contraction due to relativistic speed permanent once the body ... A: Your questions are sufficiently god that I can't give both a short answer AND a correct one. So ... | |
| Helium balloons in an accelerated frame | 10/4/2008 |
| Q: Just curious about the Helium balloons in free air. I saw in 'Nat Geo - What would happen if ?'some ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Why doesn't space shrink | 10/3/2008 |
| Q: According to Special Relativity, the lenght of and object outside of my frame contracts in the ... A: > why wouldn't its length 'go to' zero as its speed > (ignoring how it got to that speed) ... | |
| Pizza cutting with a wheel | 10/2/2008 |
| Q: I am wondering why pizza wheels are used in pizza shops instead of knives. I am guessing that this ... A: This URL answers this question -- which I've never really thought about till you asked it -- better ... | |
| Will the rod rotate? | 10/2/2008 |
| Q: I have an invention that I’m putting on hold till I can figure out the physics of the concept will ... A: > will this allow the cube/block to rotate > because of the magnets repel and attraction magnetic ... | |
| What happens when velocity equals 'c' | 9/30/2008 |
| Q: According to Special Relativity, the lenght of and object outside of my frame contracts in the ... A: > So would or would not any distance I cross become zero > at the limit of c Your question is a ... | |
| Remember Newton's Third Law | 9/29/2008 |
| Q: why is the normal force equal to the force of gravity? A: Recall that, if Object A (like something with mass) exerts a force on Object B (like a floor), then ... | |
| What light hits our eye when we see grey? | 9/26/2008 |
| Q: I think I am right in thinking that the colour we perceive an object to be is determined by the fact ... A: > grey is effectively a weaker concentration of white light? The precise wording would be "lower ... | |
| What light hits our eye when we see grey? | 9/25/2008 |
| Q: I think I am right in thinking that the colour we perceive an object to be is determined by the fact ... A: Permit me to re-state what happens when we see an object as a particular color: 1) light of many ... | |
| Melting point | 9/25/2008 |
| Q: what do we mean by the melting point of the substances which contract on melting decreases by the ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Falling objects | 9/19/2008 |
| Q: I was wondering if one person weighting 170 lbs was falling and another one weighting 100 lbs was ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Which is denser - liquid or solid | 9/17/2008 |
| Q: When does a substance has more density - in solid state or liquid state? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| You'll have to split the bet -- you're both wrong | 9/2/2008 |
| Q: In theory: if you were driving a car in space at the speed of light, and turned on the headlights ... A: > if you were driving a car in space at the speed of light You can't drive a car at the speed of ... | |
| I'm not at all familar with sterling coinage | 9/1/2008 |
| Q: why when i spin a pound coin can i see straight away which side it will land on ANSWER: Do you mean ... A: > i can see it straight away > only with a pound coin I have absolutely no idea why this would be ... | |
| I'll keep trying to answer your philosophy questions | 9/1/2008 |
| Q: 1.When we look at a apple? do we really "SEE" the apple with our eye? ... A: > Do human see the real thing? Depends what you mean by the "real thing." Our eyes are not uniform ... | |
| I'll need more info | 9/1/2008 |
| Q: why when i spin a pound coin can i see straight away which side it will land on A: Do you mean you can quickly detect that the coin is not spinning around a vertical axis, and thus ... | |
| For a general question, temps don't matter much | 8/31/2008 |
| Q: HOw do peole vent cold gases out of a place?Because for a hot gas chimney creates a stack effect by ... A: Forgive my delay in responding, but there WAS a reason why I was MUCH slower than normal. 1) after ... | |
| Some general info | 8/30/2008 |
| Q: HOw do peole vent cold gases out of a place?Because for a hot gas chimney creates a stack effect by ... A: There's one more piece of the puzzle I'll need -- the temeperature difference between the gas in the ... | |
| Why the sky looks blue | 8/29/2008 |
| Q: we know that the wave lenght of violate colour of suns light is the lowest.so the scattering of the ... A: I going to PRESUME what you're asking is, "If violet light scatters more than blue light, why is the ... | |
| Removing cold gases from a building | 8/29/2008 |
| Q: HOw do peole vent cold gases out of a place?Because for a hot gas chimney creates a stack effect by ... A: You note correctly that it is the nature of hotter gasses to rise above colder gasses. Thus, as you ... | |
| I'll try to answer your philosophy questions | 8/27/2008 |
| Q: 1.When we look at a apple? do we really "SEE" the apple with our eye? ... A: All three of these questions are more related to philosophy, the discipline asking, "How do we know ... | |
| Shattering crystal and ice | 8/19/2008 |
| Q: We know it's possible to break a wine glass with a high frequency pitch, could it do the same for ... A: Crystal can be made to shatter if and ONLY if the sound sent onto to is EXACTLY the resonance ... | |
| Evaporation vs boiling | 8/3/2008 |
| Q: I understand that alcohol evaporates at a lower temperature than water. As such, if a bottle of wine ... A: > alcohol evaporates at a lower temperature than water Not quite. Alcohol and water will BOTH ... | |
| Human differences in color perception | 8/1/2008 |
| Q: Sorry I don't mean to ask the same question again, but I have been told our cones and rod vary, ... A: I'm going to presume you are asking about this statement from that post: > we cannot be sure that ... | |
| Human differences in color perception | 8/1/2008 |
| Q: Sorry I don't mean to ask the same question again, but I have been told our cones and rod vary, ... A: > I have been told our cones and rod vary > Why the info I get here is different from rest of the ... | |
| Using expansion of ice to generate power | 7/30/2008 |
| Q: You recently commented on the pressure created when water cools and freezes. I was always intrigued ... A: Could you use the expansion of ice as it freezes to generate power? Probably. Would this power ... | |
| What we perceive | 7/29/2008 |
| Q: I want ask why do human seem seem to be able to agree on following phenomenon? -Is it true that ... A: > size? Texture? Distance? Human look? All of these can be measured in a quantitative manner. A ... | |
| Nature of color | 7/29/2008 |
| Q: I want ask why do human seem seem to be able to agree on following phenomenon? -Is it true that ... A: That the light we see as "red" is different from the light we see as "blue" is NOT a qualitative ... | |
| Fluid on outside of styrofoam cup | 7/23/2008 |
| Q: my friend left a styrofoam cup from schlotzsky's in the cupholder of his car for about a day. when ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| Mass of Earth vs mass of universe | 7/18/2008 |
| Q: How much of the universe is actually made of anything. I.E. if all the space was compressed so that ... A: First of all, I just realized I made a horribly stupid, GRADE SCHOOL error in my answer. Each time ... | |
| How big is all the universe's fermionic matter? | 7/17/2008 |
| Q: How much of the universe is actually made of anything. I.E. if all the space was compressed so that ... A: This is not an easy question to answer, for more than one reason. Just so you know, the type of ... | |
| The fly is in the car again | 7/16/2008 |
| Q: Ok so if the fly is fluttering about in the car, as earlier understood, what if you slam on your ... A: Always recall this rule -- in order to specify a velocity, you MUST specify what it is relative. So ... | |
| Fly within a car | 7/14/2008 |
| Q: When driving at a speed of 65mph does gravity effect a fly that is caught in a car? Why doesn't it ... A: When a fly flies within a car, it doesn't matter whether or not the car is standing still or moving ... | |
| Twin "paradox" | 7/14/2008 |
| Q: How come sometimes i read that if you are on a spaceship traveling an 0.99 C, when you come back to ... A: This gets a little complicated, so bear with me. Consider how you might measure the speed of a car ... | |
| WHERE DOES THE BULLET GO? | 7/13/2008 |
| Q: When you shoot a bullet up into the sky from either a rifle or pistol of .22 caliber or bigger, ... A: Like all other objects that go upwards, a bullet will fall back down to the Earth. This is a simple ... | |
| The use of certain rules | 7/12/2008 |
| Q: At the "Featival of Britain" (1952 !)they had this motor: Above a vertical bar magnet, N pole ... A: Please forgive my delay in responding. Your question is sufficiently involved that I knew I had to ... | |
| Faraday's Motor | 7/11/2008 |
| Q: At the "Featival of Britain" (1952 !)they had this motor: Above a vertical bar magnet, N pole ... A: Although I've not see _Festival of Britain_, I'm going to guess this motor is what you're referring ... | |
| What is reality? | 7/11/2008 |
| Q: I have read article from some website...and I have some issue concerning the existence of science ... A: Your questions involve more philosophy than physics, but I will try to answer them. The fact is ... | |
| Gyroscope in an auto | 7/11/2008 |
| Q: I'm not really sure what category this fits into but here's my question(s). I am remembering when ... A: Check out this URL, that explains angular momentum ('L', and its conservation) much better than I ... | |
| Center of the Universe | 7/8/2008 |
| Q: Do scientists know where the center of the universe is; i.e., where the Big Bang occured? If so, ... A: Your question is so similar to one I answered just yesterday, that I will cut and paste what I wrote ... | |
| Your questions are well-thought out | 7/8/2008 |
| Q: WHAT WOULD THE TEMPERATURE OF THE UNIVERSE BE WITHOUT MATTER? AS I UDERSTAND IT, ABSOLUTE ZERO IS ... A: > WHAT WOULD THE TEMPERATURE OF THE UNIVERSE BE WITHOUT MATTER? Since "temperature" is defined as ... | |
| Using buoyancy to reach the upper atmosphere | 7/6/2008 |
| Q: Is it possible in theory to build a tube so tall that it reaches from the ground to the upper ... A: It seems your idea is as follows: 1) build a tube from the Earth's surface to the upper atmosphere ... | |
| Nature of "force" | 7/6/2008 |
| Q: well i'd like to understand how force works, does it lose it's effeciency by time, and is force a ... A: Not sure I fully understand the questions, so I'll try to describe the nature of a "force." A force ... | |
| Energy in time warp | 6/12/2008 |
| Q: Since light-speed travel theoretically means things stop aging relative to the rest of the universe, ... A: > Since light-speed travel theoretically means things > stop aging relative to the rest of the ... | |
| Doesn't matter if it's homework or not | 6/9/2008 |
| Q: Sorry, but I don't answer homework questions.. It isnt a homework question and I wasnt asking you ... A: Your question obviously involve academic matters. In case you missed the statement I post on the ... | |
| The nature of the electrostatic field | 6/3/2008 |
| Q: The electromagnetic field comprises of photons that move at the speed of light and transfer energy. ... A: > Is this force caused by exchange photons > there is some other explanation? The simple answer is ... | |
| ball lightning | 6/2/2008 |
| Q: Recently, Max Planck Institute says it has produced something like ball lightning in the lab. They ... A: > It’s generally accepted that earth has ball lightning in the atmosphere. An excellent ... | |
| Buoyant force at greater water depth | 5/7/2008 |
| Q: I know that a body wholly or partially submersed in water experiences an upward force equal to the ... A: > the buoyancy at the surface will not increase no matter how much the depth under increases > but ... | |
| Any current research on Keely's ideas | 5/5/2008 |
| Q: If all atoms oscilate/vibrate at a specific frequency for their specific atomic weight and periodic ... A: > is there any current research into the works of John Keeley Not that I am aware of, although an ... | |
| Buoyant force at greater water depth | 5/3/2008 |
| Q: I know that a body wholly or partially submersed in water experiences an upward force equal to the ... A: Please forgive my delay in responding -- it's the only way I can think of to ensure I do not assist ... | |
| Where did the Big Bang come from? | 5/1/2008 |
| Q: If the "Big Bang" made the universe, where did the material needed for the "Big Bang" come from? If ... A: I'm not certain what point I'm supposed to ponder, but the questions you ask are similar to the ... | |
| Why is there an anti-node in an open cylinder? | 4/24/2008 |
| Q: we know if we flow air through an end coloumn, node of the wavelength forms at the end of the ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| What would happen if sub-atomic particles stopped moving | 4/21/2008 |
| Q: hypothetically what would happen to an object if all the atoms in it suddenly stopped moving? A: In our universe, sub-atomic particles (like electrons) can NOT stop moving. It is the inherent ... | |
| How do stars burn | 4/21/2008 |
| Q: how do stars burn if there is no oxygen in space A: Good question. Stars, like our Sun, are NOT like a match, with their energy coming the oxidizing ... | |
| The meaning of acceleration | 4/3/2008 |
| Q: Here's something I've never quite understood. Force equals mass X acceleration. But what is the ... A: Acceleration means the CHANGE in velocity. When you are going a constant ten miles per hour, you do ... | |
| Two kinds of "nuclear" weapons | 4/3/2008 |
| Q: my friends think there is 2 kinds of bombs nuclear and atomic I say is the same thing can you ... A: This question is as much semantics as physics. So I'll just deal with the physics. There are two ... | |
| It depends what you mean by "matter" | 4/2/2008 |
| Q: I know that Yoda says that mass and size doesn't matter, but what is the law that says that it does? ... A: I'm going to presume that this isn't an April Fool's joke, and that you're not simply making a pun. ... | |
| Average molecular velocity of liquids | 4/2/2008 |
| Q: The other day my daughter was complaining about how hard it is to get sugar to dissolve in cold tea, ... A: If you had used the following search terms in Google{R} "molecular velocity" liquid you would have ... | |
| Can sound make objects move | 3/29/2008 |
| Q: Can sound vibrations move an object. For instance if I put a feather on a table, then banged a ... A: Sound is simply vibrations through a medium, which can be air, water, or even a solid (put your ear ... | |
| Clear ice cubes | 3/24/2008 |
| Q: This is mywhy is in the middle of ice, white ? (have you noticed ?) I guess the reason must be ... A: I found these URLs by doing a search for the term "ice cubes" clear ... | |
| Matter and energy | 3/6/2008 |
| Q: i want to know ,rather upgrade myself on whether mass can be converted into energy ,what r the ... A: What happens in a collision of a particle and an anti-particle, say, an electron and a positron? ... | |
| Using EMF to warp space | 3/4/2008 |
| Q: I have a question, does the electromagnetic field generate space-time curvature like the ... A: First, let's get our terminology correct. Gravitational fields do NOT generate space-time curvature ... | |
| Depletion zones. Reverse bias. | 3/2/2008 |
| Q: i cant understand how a depletion zone is formed and why does it repel holes and electrons? how ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I do not assist ... | |
| I don't think it has anything to do with quantum physics | 2/29/2008 |
| Q: somebody said, " you can´t never ask the question that you don´t know already the answer to " does ... A: I'm going to presume the statement is, "You can never ask a question that you don't already know the ... | |
| Throwing objects of same size but different masses | 2/26/2008 |
| Q: I have asked you a question before, but you said you don't answer homework questions, even though it ... A: Very well, allow me to go to "Plan B" -- where I simply delay an answer to ensure what I say won't ... | |
| Using rare earth metals for electromagnets | 2/23/2008 |
| Q: My name is Matt, and I'm an Australian middle school student. I was wondering if i would be possible ... A: > possible to create a powerful electromagnet using rare earth magnets Unfortunately not. ... | |
| Air friction on an air hocky table | 2/20/2008 |
| Q: i have a question.....whats the friction of air on an air hockey table? Thank you for helping me ... A: The friction experienced by a puck on an air hockey table -- -- depends on the speed of the puck. ... | |
| Effect of moon's gravity | 2/19/2008 |
| Q: hope you may be able to help. I have a question about gravity, specifically the moon. I know that ... A: It is true that the moon's gravity is causing the movement of millions of tons of water. But think ... | |
| Different evaporation rates | 2/17/2008 |
| Q: why does different types of liquids example wine verses honey evaporate at room tempeture at a much ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Freezing water within an unbreakable container | 2/16/2008 |
| Q: If you had a theoretical unbreakable sealed container and had it full of water and cooled it well ... A: Because you insisted that the container be unbreakable (and, I presume, won't expand either), I ... | |
| 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: First of all, let it be known that fire, although known by us humans for tens of thousands of years, ... | |
| Where does this rain water come from? | 2/11/2008 |
| Q: There is some dirt on the side of my house, caused by rainwater hitting the adjacent sidewalk and ... A: I suppose you could put some dye into your gutter prior to a rain, and then watch the side to see ... | |
| What is a cathode | 2/11/2008 |
| Q: okay, let me see if i understand a cathode correctly. a cathode is an electrode. the way that this ... A: Unfortunately, you have it backwards. For a cathode, positive current flows out. This URL explains ... | |
| Energy never lost | 2/7/2008 |
| Q: Im having this doubt from 10th grade and none yet could give me a proper answer or I havn't tried ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I don't assist ... | |
| Jet plane hitting wall | 2/6/2008 |
| Q: I recently watched a video showing a jet airplane hitting a wall of a nuclear power plant at 500 ... A: Please forgive my delay in responding -- it's the only way I can think of, to ensure that I am not ... | |
| Why does force equal mass times acceleration? | 2/2/2008 |
| Q: i would like to start this question off by saying this isn't a homework question. so my question has ... A: Please forgive my delay in responding -- it's the only way I can think of to ensure I don't assist ... | |
| What is pressure | 1/26/2008 |
| Q: what is pressure? A: If you ask for a definition at www.Dictionary.Com you'll find 2. Physics. force per unit area and ... | |
| Using RF to trigger an earthquake | 1/23/2008 |
| Q: Could radio frequency energy be focused along a minor tectonic fault line to trigger an earthquake? A: If the energy released in a typical earthquake were instead focused into an RF generator, it would ... | |
| hydrodynamics and conservation of energy | 1/15/2008 |
| Q: There is a fire on the tenth floor of a building. The firemen can only reach the eighth floor with ... A: Please forgive my delay in responding. It is the only way I can think of, to ensure I am not helping ... | |
| Low energy light bulbs | 1/15/2008 |
| Q: If I use a low energy light bulb in a thermostatically controlled room will the saving in ... A: Please forgive the delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| The Universe and the Neurons | 1/12/2008 |
| Q: I am a researcher looking into science and religion and during my studies I have found out that ... A: > Could this pattern be a mirror effect to our neurons? Could be. But more likely it's another ... | |
| Why does multiplying mass by accel give force? | 1/9/2008 |
| Q: In my physics class we are learning about forces and i'm curious to know why you can figure out your ... A: > why any force can be calculated by multiplying > the mass by acceleration I almost never help ... | |
| Does Superman{R} violate any physics laws? | 1/9/2008 |
| Q: what are things in the movie which superman does but is not in the field of physics A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ... | |
| Properties of inert gases | 1/6/2008 |
| Q: what is the properties of inert gases? A: Please forgive my delay in responding -- it's the only way I can think of to ensure I am not helping ... | |
| Phonons outside of solids | 12/19/2007 |
| Q: In solids, the quantum of sound is the "phonon". What is the quantum of sound outside solids? ... A: Within a crystal lattice, it is useful to describe the transmission of vibrations as a set of ... | |
| Drag due to spoilers | 12/9/2007 |
| Q: I want to know if the spoiler on a car effects drag and how to determine the drag of a car. A: When I did an Internet search for spoiler drag I found these two URLs to be useful: ... | |
| Sound reflection. Also doppler effect | 12/9/2007 |
| Q: in sonar technique the reflected sound may not be perpendicular i mean to say when the sound waves ... A: Sound waves are not like bullets. When a sound wave emanates from a source -- whether due to a ... | |
| Can a sphere spin simultaneously around three axes? | 12/8/2007 |
| Q: I have a question that has left me perplexed for some time but I don't have the knowledge to be able ... A: I have understood your question from minute one. My conclusion, incorrect though it may be, is that ... | |
| On the inside of a large spinning sphere | 12/7/2007 |
| Q: I have a question that has left me perplexed for some time but I don't have the knowledge to be able ... A: > does this direction create equal centrifugal force > across the whole inner surface? Imagine our ... | |
| Spinning sphere | 12/7/2007 |
| Q: I have a question that has left me perplexed for some time but I don't have the knowledge to be able ... A: One thing to know about spin, or, more precisely, angular momentum: it's like linear momentum. In ... | |
| How does a battery work? | 12/5/2007 |
| Q: i've studied physics but have always had a little difficulty with understanding electricity at a ... A: The creation of an EMF within a battery is achieved by placing, in close proximity (but not ... | |
| Infinitely small as well as infinitely large | 12/3/2007 |
| Q: As Physics has tried and succeeded in understanding and explaining the natural world around us, ... A: The best place to start for an understanding of lengths in our universe is ... | |
| Electricity without steam turbines | 11/29/2007 |
| Q: Is it physically-possible to design and build a 400 nm laser that is directly-"pumped" by aneutronic ... A: > Is there any hope of generating electric power > without needing steam or turbines? > Any scheme ... | |
| Bremsstrahlung radiation | 11/28/2007 |
| Q: Is it physically-possible to design and build a 400 nm laser that is directly-"pumped" by aneutronic ... A: Bremsstrahlung radiation (Br) is best described in this URL: ... | |
| friction,impulse | 11/28/2007 |
| Q: sir why rolling friction is less than sliding friction?also tell is friction dependent on area of ... A: > why rolling friction is less than sliding friction? Don't know. > is friction dependent on area ... | |
| 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: To make a laser of 400 nm requires two things: 1) a substance with atomic energy states separated ... | |
| Baseball travels farther in what type of weather? | 11/24/2007 |
| Q: which type of a day would a baseball travel faster, on a sunny day or a rainy day? A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not help ... | |
| Using a motor as a generator | 11/22/2007 |
| Q: If you have a motor which is running on... say a 6v DC supply, and spins at 200rpm ... A: First of all, please forgive my delay in responding -- it's the only way I can think of, to ensure I ... | |
| Ice Expansion Force | 11/12/2007 |
| Q: How much force can freezing water exert? Is it measured in Lbs, PSI. In my eyes its power seems ... A: Scientists prefer to discuss the "pressure" exerted by freezing water, because the "force" would ... | |
| Metal Marble | 11/11/2007 |
| Q: If i have a marble ball made of metal, and i rub it with a feather for years and years will it ... A: The statement is essentially correct -- rubbing metal with a feather does remove some of the metal. ... | |
| Friction as a function of speed | 11/11/2007 |
| Q: I'm out of college and studying for the MCAT and I am reviewing some physics for the test. ... A: The coefficient of friction between two surfaces doesn't vary with speed -- UP TO A POINT! At low ... | |
| equilibrium ,electricity | 11/4/2007 |
| Q: if we are standing at corner of a table then how can we avoid us from falling at the edge of table? ... A: > if we are standing at corner of a table then how can we avoid falling Not sure I understand this ... | |
| Sonic vibrations -- same or different? | 11/3/2007 |
| Q: I have been looking at sound waves and was thinking if you could get sound waves of a certain ... A: Sonic vibrations are just another name for "sound." These are repeated changes in the density of ... | |
| Coefficient of Friction | 10/31/2007 |
| Q: Does the Coefficient of Friction ever exceed 1, if so why? A: Please excuse the delay in responding -- it's the only way I can think of to ensure I am not helping ... | |
| Arrow Flight | 10/30/2007 |
| Q: Applying a force to a free body causes it to rotate around the Center of Mass (CM). Everything I've ... A: Having looked at Mr Tarpley's URL, I must respectfully disagree with his physics. Although I have ... | |
| Arrow Flight | 10/29/2007 |
| Q: Applying a force to a free body causes it to rotate around the Center of Mass (CM). Everything I've ... A: Unfortunately, I am unfamilar with the dynamics of arrow flights, and could not find an URL that ... | |
| Throughput and output of a water jet | 10/28/2007 |
| Q: how much water goes through a water jet and is there a relationship between imput of water and ... A: First of all, do you mean what I would call a jet ski? Secondly, any time you input any substance ... | |
| E-beams "count" as particle theory of light? | 10/28/2007 |
| Q: I can't quite understand this.. can you help? Would you say that "energy of accelerated e- beams" ... A: I regret that I totally cannot figure out what you are asking. I assume by "accelerated e-beams" you ... | |
| Stereo Microscope | 10/19/2007 |
| Q: i have also been curious how a microscope actually works. Having already researdched this question ... A: This URL should explain the basics http://micro.magnet.fsu.edu/primer/anatomy/stereohome.html ... | |
| Dominoes falling, one after another | 10/18/2007 |
| Q: What factors affect domino phnomena, In other words, What are the justifcations for the following ... A: Not sure what you mean by "justifications," but I'll explain what happens. Like any object, when the ... | |
| Uranium 238 Decay Chain | 10/18/2007 |
| Q: General alpha decay of a nuclei follows the rule that the atomic number decreases by 2 and mass ... A: > When Uranium-238 decays to Lead-206, > why are there 8 alpha particles emitted? There aren't. ... | |
| The settings for Fahrenheit | 10/11/2007 |
| Q: Why has Mr. Fahrenheit adopt the number 32 among hundreds of numbers available for the tempreture in ... A: > Why [did] Mr. Fahrenheit adopt the number 32 > for the tempreture in which water freezes? This ... | |
| "Translational" Forces, as well as Roller Coasters | 10/5/2007 |
| Q: Do all translational forces have to be parallel? ANSWER: I regret that I am uncertain exactly what ... A: > forces on a object are translational when they are equal to zero. > So must the separate forces ... | |
| Meaning of 'nm' | 10/5/2007 |
| Q: What does th symbol nm stand for? I know it has something to do with UV and sunlight but still ... A: The quickest way to learn what a word or abbreviation means is to go to Dictionary.Com and enter ... | |
| Gaseous ions in an enclosed area | 10/4/2007 |
| Q: What would happen if you put a high concentration of both positive and negative charged ions in a ... A: I'm going to presume you mean gaseous ions. Both the postive ions and the negative ions would drift ... | |
| What is extradimensional gauge freedom? | 10/2/2007 |
| Q: http://en.wikipedia.org/wiki/Orders_of_magnitude_(temperature) According to the above link, the ... A: Unfortunately, I have never heard of this term, and a Google{R} search for it found nothing. This ... | |
| Frictional forces | 10/2/2007 |
| Q: I don't get what the force of friction has to do with the normal. Friction goes against the ... A: Actually, the friction DOES depend on the surface area. And the materials sliding against each ... | |
| Photons and EM waves | 9/27/2007 |
| Q: How is it that a neutral photon creates an electromagnetic wave? A: > How is it that a neutral photon > creates an electromagnetic wave? It doesn't. It *IS* an ... | |
| Canterbury Ring Laser | 9/17/2007 |
| Q: Is it possible to detect tangential rotation speed of the Earth, using interferometer (of any kind - ... A: Now that I have the URL you are curious about, I can answer your question. Our Earth is spinning on ... | |
| Change in Earth's magnetic field | 9/17/2007 |
| Q: I had 3 Questions, 1) May I know what are all disadvantages that we are going face when ... A: Please excuse my delay in responding: it's the only way I can think of to ensure I am not assisting ... | |
| Spinning magnet on a string | 9/8/2007 |
| Q: If we shield a magnet against magnetic field of the Earth (close him in a ferromagnetic box, for ... A: Please excuse my delay in responding -- it's the only way I can think of to ensure I am not ... | |
| Circuit never fully completed, but rapidly changed | 9/4/2007 |
| Q: I was wondering if electrical conduction would occur at any point given the following scenario... ... A: My view of your setup looks like something this, where 'B' is the battery, 'N' is its negative pole, ... | |
| Using order of magnitude | 8/31/2007 |
| Q: I just have a really quick question about estimation in physics by using order of magnitudes. Is ... A: The purpose of order of magnitude is to prove something without resorting to involved calculations. ... | |
| So small a component as to almost not matter | 8/24/2007 |
| Q: I hope this doesn't seem whimsical. But I get heat stroke, so it's important to me. On a sunny day, ... A: As someone who's hiked in the summer -- in Phoenix -- in the middle of the afternoon -- at temps ... | |
| Frames of reference | 8/18/2007 |
| Q: If im driving at 100km/h on the highway, and theres a fly sitting on the seat next to me, and it ... A: All measurements of velocity must be specified relative to a specific "frame," which is defined as ... | |
| Free gluons on Earth | 8/14/2007 |
| Q: Theoretical situation: It is 12:00 AM on a dark moonless, cloudless night in the desert. I am here ... A: This URL explains gluons quite well: http://en.wikipedia.org/wiki/Gluon Please note the statement ... | |
| Electron capture or positron emission | 8/8/2007 |
| Q: In charts of nuclear decay processes, I often see the process of a proton decaying to a neutron as ... A: First of all, protons do not decay (or, at the very least, their half-life is over 10^33 seconds). ... | |
| physics of baseball after leaving pitcher's hand | 8/1/2007 |
| Q: When a pitcher throws a ball after the ball leaves his hand is there a force still acting on the ... A: Please forgive my delay in responding. It is the only way I can think of, to ensure I am not ... | |
| Not a law of physics BUT | 7/27/2007 |
| Q: Is there a theory or law about opposites occupying the same space?? I cant find anything in online ... A: What's your asking about is more of a "law" of logic. If you define a certain entity (let's say ... | |
| Opposites occupying same space | 7/20/2007 |
| Q: Is there a theory or law about opposites occupying the same space?? I cant find anything in online ... A: I hate to sound evasive, but I'm not certain what you mean by "opposites" and the "same" space. The ... | |
| Train vs Tree | 7/18/2007 |
| Q: I'm not sure if I'm asking the right sort of expert but I thought I'd give it a try! Obviously I ... A: Do an Internet search for the mass of a 1) locomotive 2) train car 3) tree You may find it easier ... | |
| Javelin Force | 7/16/2007 |
| Q: Bit of a random one - but any help you could provide would be much appreciated. This isn't for a ... A: Please forgive my delay in responding, but it's the only way I can think of, to ensure I don't give ... | |
| sound | 7/11/2007 |
| Q: sir i know that this may not really be related to your field, its related to resonance of sound, but ... A: Please forgive my delay in responding, it's the only way I can think of to ensure I am not aiding ... | |
| relativity | 7/6/2007 |
| Q: Is the entire crux of the theory of relativity based on the finiteness of the speed of light AND its ... A: > Is the entire crux of the theory of relativity based on > the finiteness of the speed of light AND ... | |
| Fields | 7/3/2007 |
| Q: I was wondering, what exactly in physics is meant by a "field"? I have done a little research on it, ... A: First of all, some VERY basic background. When we humans attempt to develop a system to comprehend ... | |
| Acceleration and terminal velocity | 6/18/2007 |
| Q: My knowledge in physics does not extend much past secondary education level so I may be missing ... A: I think what's happening is that you're misunderstanding the purpose of the equation F = ma When ... | |
| optical depth | 6/5/2007 |
| Q: .. I was wondering if you could possibly help me to understand optical depth. I know its a measure ... A: I regret that I don't understand the specific question. If you want to understand Optical Depth, the ... | |
| uncertainty principle | 6/3/2007 |
| Q: I'm having trouble getting to grips with Heisenberg's Uncertainty principle and the thought ... A: > Wikipedia says that this is erroneous I've looked at the Wikipedia article on "Uncertainty ... | |
| Freezing: water vs Gatorade{R} | 6/3/2007 |
| Q: How does Gatorade freeze or does it freeze like water? A: The carbohydrates in Gatorade{R} brand sports drink will cause it to freeze less quickly than plain ... | |
| angular momentum | 5/24/2007 |
| Q: if a solid sphere is executing rolling with slipping motion on a rough horizontal plane then is the ... A: Please pardon my delay in responding -- it's the only way I can think of, to ensure that I am not ... | |
| Electrical appliances enclosed in conducting material | 5/20/2007 |
| Q: why electrical appliances such as tv is enclosed in a conducting material? A: Any electrical appliance, by its very nature, will emit radio waves as it operates. These radio ... | |
| Balances, Water Whirled in a Bucket | 5/7/2007 |
| Q: what is the difference between a chemical balance and physical balance? when a bucket full of water ... A: Please forgive my delay in responding -- it's the only way I can think of to ensure I am not helping ... | |
| First use of fire | 4/30/2007 |
| Q: how man was obtained fire first time? A: Here's some info that may be of interest to you: http://www.wwp-info.com/history-of-technology.htm ... | |
| Time Travel concept | 4/26/2007 |
| Q: I am curious about Time Travel. I have read and seen material on the topic. Most tend to sway to the ... A: There are three ways to do time travel -- 1) in agreement with what we presently know about our ... | |
| Time Travel concept | 4/26/2007 |
| Q: I am curious about Time Travel. I have read and seen material on the topic. Most tend to sway to the ... A: > I know the government is most likely WAY ahead of me on this. In a sense, they are indeed. The ... | |
| microwave safe substances | 4/21/2007 |
| Q: What makes a cup microwave safe and contrary what makes a cup not microwave safe? What substances ... A: Please pardon my delay in answering -- it's the only way I can think of to ensure I am not assisting ... | |
| The Fly and the Car | 4/21/2007 |
| Q: My question is as follows: While in a car the other day with the window open, I was wondering what ... A: The physics of this question is almost moot. A fly can rapidly adjust its path based on changes in ... | |
| Inefficientcy of Incandescent Bulbs | 4/16/2007 |
| Q: I was just wondering why incandescent bulbs are so inefficient (in terms of physics) compared with ... A: > it because the energy goes through > more stages in an incandescent bulb? Actually, there is ... | |
| GRAVITY vs. THE LEVERLAW | 4/14/2007 |
| Q: dedanoe to NASA/ESA: GRAVITY vs. THE LEVERLAW (in attempt to move the world with a single coin) you ... A: This is a classic comparision of apples and oranges, if not apples to horses. The universe we live ... | |
| Friction | 4/10/2007 |
| Q: frictional force acts to oppose one surface from sliding relative to the other with which it is in ... A: Please pardon my delay in responding -- it's the only way I can think of to avoid giving academic ... | |
| Generating electricity with rotational motion | 4/10/2007 |
| Q: Sir,I want to know can we generate electricity in vacuum? ANSWER: Since 1) electricity (as I think ... A: > can we use the rotational motion Of what? > in vacuum to generate electricity When you say ... | |
| Electricity | 4/9/2007 |
| Q: Sir,I want to know can we generate electricity in vacuum? A: Since 1) electricity (as I think you mean it) involves the flow of charge, and 2) charged particles ... | |
| The speed of light | 4/9/2007 |
| Q: to find this by Internet: The speed of the light surpassed by Javier Shepherd: 6 Tuesdays March ... A: Your last few sentences answer your question. Einstein never maintained that "nothing" can travel ... | |
| Workings of jet powered personal watercraft (pwc) | 4/5/2007 |
| Q: This is a question about water jet powered water craft like jetskis'. Does the water jet exit from ... A: Please pardon the delay in response -- it's the only way I can think to ensure that I'm not ... | |
| What lasers can blast through | 4/2/2007 |
| Q: I don't know much about lasers ,so this ques is kind of amatuerish. Anyway, i have often seen ... A: This is a good question, and the answer is neither simple nor straitforward. So I'll give you a ... | |
| Frequency reponse as weage | 3/28/2007 |
| Q: I was wondering does the frequency response in human decrease as you get older, if so y? A: It has been found that, as we age, our ability to hear higher frequency sounds decreases. As I have ... | |
| newton's law of cooling | 3/27/2007 |
| Q: Taking newton's law of cooling into consideration, (basically objects cool/heat faster when the ... A: What will happen is that the temperature of cooled chocolate will (initially, anyway) more rapidly ... | |
| Beta decay | 3/27/2007 |
| Q: When beta particles are produced by e.g. Po --> At and it's mass increases by 1, a beta particle is ... A: All neutral atoms have the same number of protons and electrons. This article explains what ... | |
| Magnetic and Electric Fields | 3/26/2007 |
| Q: what is the difference between a magnetic and an electric fields?? A: An electric field exerts a force on a charged particle, in the direction of the field and whether ... | |
| Work = force overcome X distance | 3/17/2007 |
| Q: Suppose a man pushes a block on a rough floor horizontally with a constant force.The work done BY ... A: Alright, let's start over. We have water. It is expanding against air. The air fights back with a ... | |
| Receivers | 3/17/2007 |
| Q: What do the terms homodyne receiver, heterodyne receiver, intradyne receiver stand for? (please ... A: This PDF file explains it as well as any URL I could find: ... | |
| Work = force overcome X distance | 3/15/2007 |
| Q: Suppose a man pushes a block on a rough floor horizontally with a constant force.The work done BY ... A: > The work done BY THE MAN is ONLY dependent on the force HE EXERTS > it is COMPLETELY ... | |
| Work done by expanding water | 3/14/2007 |
| Q: When water exposed to atmosphere is boiled ,why is the work done BY THE WATER taken as (atmospheric ... A: When a liquid expands against an atmosphere, the force it must overcome to do so is the atmospheric ... | |
| Air Resistance in air hockey | 3/13/2007 |
| Q: How does air hockey lack air resistance? A: I'm not sure I understand the question. The puck in air hockey (which I presume you are talking ... | |
| Photoelectric effect-work function | 3/12/2007 |
| Q: What is the CAUSE of the work function of a metal? What determines its value? A: This URL explains it better than I could: http://en.wikipedia.org/wiki/Work_function Basically, ... | |
| neutrino/antineutrino | 3/10/2007 |
| Q: Is neutrino the anti particle of itself.Or their some difference between a neutrino and what is ... A: > Is [the] neutrino the anti-particle of itself? The answer is "no," based on our PRESENT ... | |
| Time dilation at relativistic speeds | 3/1/2007 |
| Q: I'm having difficulty with time dilation and the following paradox. Assume two rockets. One ... A: There's no paradox, because you're jumping across something that you shouldn't -- even though it's ... | |
| Temperature to ignite atmosphere | 2/27/2007 |
| Q: I heard this in a movie ("The Fantastic Four") and got curious. With a high enough temperature, is ... A: Although chemistry is not my specialty, I'll say no. The atmosphere itself will not ignite no ... | |
| Types of energy | 2/25/2007 |
| Q: Is thermal energy of a system merely the sum of the KINETIC ENERGY of all the microscopic particles ... A: > Is thermal energy of a system merely the sum of the KINETIC ENERGY > of all the microscopic ... | |
| One foot or two on a scale | 2/22/2007 |
| Q: Sir, I realize that, but the scale we have in the office gives multiple readings when one uses two ... A: > the scale we have ... gives multiple readings when one uses two feet When one does scientific ... | |
| Open U-tube with water on left and mercury on right | 2/21/2007 |
| Q: The crux of your answer,as i understand it, is that BECAUSE mercury is far denser than water, even a ... A: > When M' is 1 MILLIMETER OR LESS BELOW THE MERCURY SURFACE > and the water above M', is say ... | |
| Open U-tube with water on left and mercury on right | 2/20/2007 |
| Q: I am afraid there is still something i dont understand.I did mention it ,but either you missed it , ... A: > The forces here are the weight (or pressure let's say) of the air DOWNWARDS; > AND the Weight of ... | |
| Measuring height difference between mercury and water | 2/19/2007 |
| Q: The ques i ask is actually based on a very standard numerical present in almost all physics books. ... A: You may be confusing two things. At the interface, the force from the water and the force from the ... | |
| Pseudo-forces in a rotating frame | 2/8/2007 |
| Q: I am an 18 year old sceience student and have a fairly sound understanding of pseudo forces in ... A: Let's do another thought experiment. Imagine two masses of equal size, spaced four meters apart, and ... | |
| Why don't you fall on a moving bicycle | 2/7/2007 |
| Q: I have always wondered how a two wheeler like bicycle, motorcycle gets balances itself while moving ... A: I admit it took me a while, but starting with a Google{R} search for bicycle "why don't you fall" ... | |
| Solid object floating between two fluids | 2/3/2007 |
| Q: Your answer explains a lot,Thanks. The ques. i ask now is based on the 2nd part of my original ... A: > this is no homework question. No need to deny something that doesn't matter. If you are seeking ... | |
| Why only rotate around center of mass (CoM)? | 2/3/2007 |
| Q: I can understand why an object accelerates in the direction of the force when subjected to it , and ... A: > THIS IS NOT A HOMEWORK QUESTION No need to deny something that doesn't matter. If you are seeking ... | |
| "Origin" of the buoyant force | 1/31/2007 |
| Q: What is the origin of the buoyant force? WHERE on the object submerjed in the liquid does this ... A: Please pardon my delay in answering -- it's the only way I can think of to ensure I am not helping ... | |
| Effect of force on object free to rotate | 1/30/2007 |
| Q: Would a body ,Free to move in every way, (say, in interstellar space) when subjected to an impulsive ... A: Please pardon my delay in answering -- it's the only way I can think of to ensure I am not helping ... | |
| Brachistochrone | 1/29/2007 |
| Q: How would you explain in plain words (I mean, not the proof) why the straight slope is not the ... A: On a straight slope, an object will not accelerate as rapidly as it would on a nearly vertical ... | |
| Ice blade sticking up from cup of frozen water | 1/29/2007 |
| Q: I left a styrofoam cup half full of water in my automobile overnight when the temperature dropped to ... A: The following are only guesses; I have no real certainty. If the cup had a top on it while the ... | |
| Electric potential | 1/25/2007 |
| Q: please someone explain me what exactly is meant by electric potential and potential difference. why ... A: The "electric potential" of a point -- also known as its "voltage" -- is a mathematical term helping ... | |
| Special relativity | 1/19/2007 |
| Q: Lenght contraction and time dilation in Special Relativity is puzzling me greatly. This is what I ... A: I regret the delay in answering. I tried to think exactly how to answer this, but couldn't derive a ... | |
| Poof and foop (my guess) | 1/10/2007 |
| Q: It's just a question we're talking about among friends from some book. This link might help prove ... A: My best guess is that the can will move to the right. The can is exerting a "force" on the air, ... | |
| EM radiation in optically denser medium | 1/8/2007 |
| Q: WHY does the speed of light decrease when it enters a optically denser medium? Using the particle ... A: Before we begin, we have to understand something about photons, and about how they are used. In ... | |
| Air resistance while running | 1/7/2007 |
| Q: We are a group of runners trying to figure out how to optimise our running performance. so we were ... A: Please pardon the delay in responding -- it's the only way I can think of to ensure I am not ... | |
| Vibrational frequency of planet and human | 1/3/2007 |
| Q: Do you know what the vibrational frequency of the plaent is? Do you know what the vibrational ... A: > Do you know what the vibrational frequency of the plaent is? When a question similar to this was ... | |
| Change in electric force | 1/1/2007 |
| Q: Since you gave 2 possible explanations for the reduction in force I presume that the CAUSE of the ... A: > The dielectric is ... exerting a force on the charges, right? > why in your answer did you put the ... | |
| Change in electric force | 12/31/2006 |
| Q: I know that a gravitational sheild is not possible.Which essentially means that the GRAVITATIONAL ... A: One can argue whether the change in the electric force between two charged objects, when there is a ... | |
| Changing frames with colliding objects | 12/25/2006 |
| Q: As i understand your solution it seems a lot of what you say is based on 1 and 2 NOT moving in the ... A: > So now what? The approach works no matter what happens after collision. Calculate the KE in any ... | |
| Changing frames with colliding objects | 12/22/2006 |
| Q: Consider two particles m and M moving TOWARDS EACH OTHER with speeds v and V respectively MEASURED ... A: Okay, I believe you when you say this is not a homework question. And I admit I had to give it a lot ... | |
| "Advantages" of String Theory | 12/20/2006 |
| Q: what are the advantages of the string theory? A: I'm going to presume your question is, "Why should people choose String Theory as an overall ... | |
| What does current measure? | 12/16/2006 |
| Q: And I had anotherThe electric current in a wire is the rate at which charge moves in the wire. Does ... A: When there is a current flowing in a conductor, the electrons are the objects that are actually ... | |
| Falling objects in a medium (like air) | 12/15/2006 |
| Q: If a hammer and a feather on the moon( or in a vacuum), when dropped, fall at the same rate and hit ... A: Please excuse my delay in answering -- it's the only way I can think of to ensure I don't give help ... | |
| How do objects become charged | 12/13/2006 |
| Q: I have some questions and would be grateful if you could answer them. 1) "Why" does an object ... A: 1) Some of the electrons are actually moved around by the rubbing, and, because the substance is not ... | |
| Adding velocities | 12/11/2006 |
| Q: This is probably a vey old question, I apologise in advance. It has become an argument out of all ... A: I don't mind answering a good question no matter how many times it is asked. And this is NOT a dunce ... | |
| Why are magenetic poles negative and positive? | 12/11/2006 |
| Q: Why are the poles of a magnet negative and positive? A: First of all, they're not. They're north and south. But they do have a negative and repulsive factor ... | |
| Relativity basics | 12/10/2006 |
| Q: I need clarification on the past, present, and future coexisting, all at once? I read Einstein ... A: > I need clarification on the past, present, and future > coexisting, all at once? As you request, ... | |
| Why don't nuclei collapse? | 12/7/2006 |
| Q: In a Deuterium nucleus if an attractive nuclear force is the only force between the proton and ... A: The fact is that two baryons (protons and neutrons are baryons) cannot occupy the same physical ... | |
| Temperature of a single molecule | 12/6/2006 |
| Q: Dose a single molecule has Temperature(the average kinetic energy)? A: Please pardon my delay in responding -- it's the only way I know to ensure I'm not helping with ... | |
| Difference between friction and air resistance | 12/6/2006 |
| Q: What is difference in their action?What is difference between Frictional Force and Air Risistance? ... A: If your original question had been "What is the difference between a truck and an 18-wheeler?", I ... | |
| What determines current in a chemical battery | 12/5/2006 |
| Q: i made a lemon battery by connection about 24 lemons in series and get a voltage of about 20 volts. ... A: The amount of current that can be generated by a battery (or any kind of generator) is limited by ... | |
| valence and conduction bands | 12/4/2006 |
| Q: I learnt that in a material tehre is a valence band and a conduction band. In a metal the valence ... A: I'm not sure if "bands" if the best explanation for this. Just think in terms of electricty as the ... | |
| "Mass" has two different effects | 12/4/2006 |
| Q: I understand that when an object falls to the earth, the mass of that object causes gravity to exert ... A: You are confusing two aspects of "mass." Permit me to unconfuse you. Any two objects with mass ... | |
| Solar Cells | 11/26/2006 |
| Q: I want to know about Solar Cells.I should make a car that is work with solar energy.Could you help ... A: > Could you help me to find some general information about Solar Cell? If you do an Internet ... | |
| What is the "Earth Frequency" | 11/25/2006 |
| Q: Author Ray Kurzweil, on page 187 of his book Fantastic Voyage states that "Over the course of ... A: In my Google{R} search for "earth frequency" "8 hz" I found no scientific discussion of such a ... | |
| Using an air tank to store power from a wind turbine | 11/2/2006 |
| Q: I am not a student doing homework. I am investigating the feasibility of a new type of wind ... A: The basic problem I see is this: you cannot store more energy in your air tank than you have created ... | |
| Why exploding a bomb won't cause the core to rotate | 11/2/2006 |
| Q: I recently watched the movie "The Core". In this movie, the core of the earth has stopped spinning, ... A: Since I've never seen the movie, I don't know how correct (or incorrect) is the physics of ... | |
| Traveling at the speed of light | 10/31/2006 |
| Q: I am not sure if all my facts are right but from what I hear the closer an object gets to the speed ... A: What you heard is partly correct -- as viewed from a frame in which an object is in motion with ... | |
| Weight in water VS weight on land | 10/31/2006 |
| Q: This question has come about because I have snapped my fishing rod, lifting a 1 kilo weight out of ... A: Please pardon my delay in replying -- it's the only way I know to ensure against homework questions. ... | |
| Effect of life on the Earth / Moon orbit | 10/30/2006 |
| Q: millions of years ago the earth was a baron rock with a moon. the earth and the moon had a set mass ... A: > taking one material and making another has no or very little > differance on the weight of what ... | |
| Types of EM radiation | 10/17/2006 |
| Q: what is the type of electromagnetic radiation used in a microwave oven,satellite TV, toaser and TV ... A: I apologize for my delay in responding; I've found that is the best way to ensure I am not helping ... | |
| I'm a little confused | 10/15/2006 |
| Q: Can you tell me what would happen to the atmoic number and mass number of a nucleus when it emits a ... A: I'm not familar with any nuclear reaction that would result in a nucleus emitting an electron, a ... | |
| Falling objects when air resistance is neglected | 10/13/2006 |
| Q: what happens to the distance between two balls falling from a 20th floor window if there is no air ... A: I apologize for the week's delay in replying. I've found that an intentional delay is the only way ... | |
| Objects within a falling barrel | 10/13/2006 |
| Q: What will happen if a person and an apple are in a barrel going over Niagra falls. I think if a ... A: I apologize for taking a week to answer -- I've found that intentionally delaying an answer is the ... | |
| Printable periodic table, with symbols and names | 10/6/2006 |
| Q: I am not a student. i am an adult seeking info for my own personal use. Do you know where I can get ... A: I'm surprised you had so much trouble. When I did a Google{R} search for "periodic table" printable ... | |
| Earth gravity | 10/6/2006 |
| Q: 1.what is gravitational force of attraction at the centre of the earth? 2.what is the centre of the ... A: I'm not certain I understand these questions. I'll tale some guesses on what you're asking, but even ... | |
| What is fire exactly? | 10/1/2006 |
| Q: Recently, on the space shuttle, an experiment showed balls of flame (ignited hydrogen) floating ... A: Here's two good articles on what exactly a "fire" is. ... | |
| What would we see at the speed of light? | 9/30/2006 |
| Q: My question is about travelling at the speed of light. If I could travel exact at the speed of ... A: The question of what humans would see if they traveld at light speed is an interesting one. So ... | |
| Electrical nature of fire -- not certain I understand | 9/30/2006 |
| Q: Does fire have an electrical nature and if so could you explain it? Thanks - Doug. A: I'm not sure what you mean by an "electrical nature." The effect we call "fire" is the result of ... | |
| Using radar to scan humans | 9/28/2006 |
| Q: Why isn't it possible to use satellite-based ground penetrating radar to scan the human body? I ... A: > Why isn't it possible to use satellite-based > ground penetrating radar to scan the human body? ... | |
| Not sure why you're asking me this | 9/26/2006 |
| Q: how can physics be applied in our everyday life every if we keep doing sums and questions? A: Allow me to make some guesses on why you are posting this question to me. 1) Are you using me as a ... | |
| The end of sound waves | 9/25/2006 |
| Q: Do sound waves ever end? A: Vibrations we call "sound" are simply vibrations that are well organized (for instance, they ... | |
| Love your heading, but | 9/21/2006 |
| Q: The way I understand it is this, membranes have area to them, to which strings are connected. Is a ... A: You seem to misunderstand string theory in many ways. A "brane" is the limit to what we humans in ... | |
| Some info on optics | 9/16/2006 |
| Q: This is not homework. I realize that color is related to the electro magnetic frequency. If someone ... A: > Did the frequency of the electromagnetic waves > change with the color of the light? No. EM ... | |
| I hope you'll trust my answer | 9/15/2006 |
| Q: The web site that I just visited says that work = force over distance. I learned in school that it ... A: The amount of work necessary to move an object against a force is equal to the force times the ... | |
| Motion of satellites | 9/6/2006 |
| Q: why satellites dont fall down over earth service?..which making it spin around?..i know u may answer ... A: Disclaimer: if I am unable to explain it to your satisfaction, an Internet search will very rapdily ... | |
| Because | 9/5/2006 |
| Q: why entropy of universe is increasing A: The entropy of a system is basically a measure of the number of its allowed states. We happen to ... | |
| The speed of the fly | 9/2/2006 |
| Q: I want to ask- If I'm sitting in a running train & a fly or bee is flying in front of my nose trying ... A: The fly's speed can only be measured in reference to a "frame of reference." This is whatever you ... | |
| I hate to say this but | 8/29/2006 |
| Q: what forces act on acceleration and velocity, i think its either intertia or gravity but im not ... A: I conclude you are confused at a very basic level. Forces do not act on either acceleration or ... | |
| I'm going to make some assumptions | 8/29/2006 |
| Q: my question is why when i drop the ball bearing did it not just drop down and hit the paper were ... A: You are holding a ball bearing over a target, you attempt to line up the bearing directly over that ... | |
| What experiments? | 8/27/2006 |
| Q: What experiments could I do about special relativity? A: Can you yourself do about special relativity? None, unless you can accelerate something to least ... | |
| What's wrong? | 8/8/2006 |
| Q: I am trying to design a device that will auto siphon but it seems to easy to work and I've never ... A: Think conservation of energy (a good place to start when evaluating the feasibility of perpetual ... | |
| Not sure I can help you | 8/6/2006 |
| Q: I'm a Mechanical Engineering student who's very interested in the game Roulette. Lately, I've ... A: If you want to prove to you that this system is phony, I can't do that -- he simply says the same ... | |
| Think of the results, think about gravity's power | 7/21/2006 |
| Q: This is actually sort of a two-parter: Simply can what we see happening in the Two Slit Experiment ... A: > I was wondering if it was possible that the actual gravitational pull > of the observing device ... | |
| One thing I don't understand | 7/21/2006 |
| Q: I believe this would involve physics, though possibly not as much as I think, anyway, here's the ... A: Any time you define a speed, you have to define what fixed object the speed is relative to. I ... | |
| Let's take a simpler example | 7/19/2006 |
| Q: so let say you get a very very long tube, and you plug one end and then put it in the ocean with the ... A: Take a body of water the size of Lake Erie, within about forty kilometers of another body of water ... | |
| Let me make certain I understand your thought | 7/18/2006 |
| Q: My idea isn't so develpoed as to have a specific course on the reactions, but as far as I can tell ... A: As best I can discern, you're asking if there exists a field (whose property is presently pure ... | |
| Some things you need to know -- some things I need to know | 7/17/2006 |
| Q: I've had this Idea for a long time, but figure it has no basis since it comes from my imagination. ... A: Some things you need to know: 1) physical systems are NOT like the stock market. In the latter, you ... | |
| Two parts of what is sent out | 7/9/2006 |
| Q: This is something that has baffled me since I was doing physics at school. If, say, a radio wave has ... A: In any broadcast through the air, there are two parts of what is sent out. 1) The carrier signal. ... | |
| Certain laws can not be repealed | 7/9/2006 |
| Q: How can an electric motor consume so much energy (electricity) when all the power source connected ... A: I regret to admit a feeling of dismay bordering on discouragement that I have not been able to ... | |
| Allow me to rephrase my answer | 7/8/2006 |
| Q: Please tell me if I have water from NY and water from Florida and I boil both will they still taste ... A: Bring together some Florida water and some New York water -- either taking some from one state to ... | |
| Let me suggest this | 7/7/2006 |
| Q: Please tell me if I have water from NY and water from Florida and I boil both will they still taste ... A: Bring together some Florida water and some New York water -- either taking some from one state to ... | |
| I really have no idea | 7/6/2006 |
| Q: What's the formula to calculate the torque needed to move a, say, static 1 ton object to, say, 10 ... A: > What's the formula to calculate the torque needed to move a, > say, static 1 ton object to, say, ... | |
| This URL should explain it | 7/5/2006 |
| Q: I understand a little bit about the differences between convex and concave lenses. However, I ... A: http://en.wikipedia.org/wiki/Magnification It explains the relationship between focal length and ... | |
| I really have no idea | 7/4/2006 |
| Q: I mean, is it possible to use an iron (serve as solenoid so that it can have alternating magnetic ... A: Off the top of my head, I don't know if the magnetic density of permanent magnets is stronger or ... | |
| Different problem | 7/2/2006 |
| Q: But I need to ask you one more thing to clear my doubts and confusion. Let's talk about cars. We ... A: With a gear box (indeed, with most any MECHANICAL device) you have a trade-off of speed versus ... | |
| Gearbox won't help | 6/29/2006 |
| Q: Yeah, but I am using the gearbox to slowly increase the generator's speed. At first, the generator ... A: Sorry, you can't gain ENERGY by using a gearbox. Do the calculation, and you'll find that a gearbox ... | |
| Motor Spent? | 6/28/2006 |
| Q: Why does an electric motor need so much electricity to rotate productively? Which part of the motor ... A: > Why can't power companies use electric motors that use enough kW > to turn their massive ... | |
| Don't confuse two things | 6/22/2006 |
| Q: Again, lets forget the relativistic corrections, only tretat who is the preferred frame of reference ... A: Let's imagine that we have two observors in boxes in space, in motion relative to each other, and ... | |
| You've gotten to the heart of one of Einstein's Postulates | 6/22/2006 |
| Q: IN the low velocity case of the ball on the train, we find that to the passenger, the ball has no ... A: > Does somone have a preferred refernce frame at constant velocity? The answer is simple: no. You ... | |
| It took a while, but | 6/22/2006 |
| Q: How much carbonation can be put into water? or in other words how much co2 can water have in it? ... A: The physical property I was looking for is called "solubility," or the concentration of a substance ... | |
| It's more complicated than you think | 6/22/2006 |
| Q: I realized that with kinetic energy KE=1/2mv^2, and special relativity says all frames are equal, ... A: Let's imagine a ball, standing still in a train that is moving with constant velocity relative to ... | |
| Please realize something | 6/22/2006 |
| Q: can an electric turbine (no burning fuel) generate equal thrust compared to a gas turbine that you ... A: The turbine on a jet airliner is not generating thrust by taking in it air from its front and then ... | |
| At its most core level | 6/20/2006 |
| Q: Can you please tell me the fundamental difference between classical mechanics and Einstein’s theory ... A: In classical mechanics, an observor traveling at 90% of the speed of light, moving parallel to a ... | |
| I'm afraid I don't understand the question | 6/16/2006 |
| Q: I'm interested to know in how are vectors and other aspects of physics used in weapons technology? ... A: Using vectors is a standard mathematical approach for determing the path taken by any object in ... | |
| Very well | 6/15/2006 |
| Q: although I am a 46 year old real estate professional. My kids are 11 and 8 years old and this is ... A: Any time I see exact numbers in a question, I presume it is a homework assignment; people just ... | |
| Forces of attraction ! | 5/18/2006 |
| Q: Newton's law states that there is a force of attraction between two masses... (the masses dont ... A: You're confused at some level. The attraction between two masses exists irrespective of any presence ... | |
| Theoretical question on relativity | 5/12/2006 |
| Q: Consider a train , its proper length = 375000 km , traveling at a speed of 180000 km/sec (0.6 of ... A: I'd rather not spend the time figuring out where you went wrong, but this fact is simple: the speed ... | |
| physics | 5/11/2006 |
| Q: Okay, I was discussing this with my world geography teacher, I became really confused (He is an ... A: I have no problem with "Thought Experiments," wherein you set up a situation that would be ... | |
| physics | 5/11/2006 |
| Q: from a scientific investigation, what is bias? A: "Bias" is the tendency for an experiment to deliver (or be viewed as delivering) one set of data ... | |
| nuclear force | 5/1/2006 |
| Q: How do you explain wek nuclear force to high school physics students (regular and Pre-AP) A: I'm not certain I understand the question. Why would explaining the weak force be any more ... | |
| Optics | 4/23/2006 |
| Q: If you cound bend light around in a circle using mirrors, and move the light source out of the way ... A: In a theoretical sense, yes. EM radiation (ie, light) will continue until it reaches something that ... | |
| colours | 4/22/2006 |
| Q: could you please explain to me what happens when light comes in contact with molecules or atoms and ... A: It would help me to answer if I had a clearer understanding of your question. Are you asking 1) how ... | |
| Signal virtual reality | 4/18/2006 |
| Q: This is a somewhat theoretical question. I was curious if there was a way that one could use a radar ... A: A few things to know and consider, some of which may be problematic: 1) radar must have both an ... | |
| Signals and frequencies | 4/18/2006 |
| Q: Well to me it doesn't seem out of the question that people in general practice very unhealthy ... A: > I'm sure that people have justifably argued that by having to live > under power lines or other ... | |
| Signals and frequencies | 4/17/2006 |
| Q: I get the feeling that stuff like inferred remote devices, radio signals, close proximity to ... A: > have increased in health problems Your starting point has a MAJOR fallacy. When the effects of ... | |
| Twin Paradox Again | 4/17/2006 |
| Q: Twin 'A' remains on Earth. Twin 'B' in a warp-drive ship is moving at a CONSTANT velocity near light ... A: Let me respond to BOTH of the issues you raised. 1) If two frames are moving in constant motion ... | |
| nuclear fusion | 4/10/2006 |
| Q: Where does the energy come from in fusion? I know that it comes from mass converting into energy, ... A: It's not QUITE mass converting into energy, as the number of hadrons before and after the fusion ... | |
| photons | 3/29/2006 |
| Q: Followup To Question - A photon is Planck's constant times the frequency of the radiation. How ... A: > You cannot change the force or velocity > of a single wave of light can you? This might be where ... | |
| photons | 3/28/2006 |
| Q: A photon is Planck's constant times the frequency of the radiation. How would the energy of a ... A: Okay, let's say that we humans, instead of defining a second as 1/60 of a minute (which is 1/60 of ... | |
| special relativity twin paradox | 3/28/2006 |
| Q: I understand and agree with your explanation of the twin paradox. But I would like to restate my ... A: If both clocks maintain the same relative motion one to another, and both happen to meet again ... | |
| special relativity twin paradox | 3/27/2006 |
| Q: The twin paradox of special relativity is resolved by the fact that the twin who experiences an ... A: Both twins start in the same frame, with no velocity relative to each other. They end in the same ... | |
| quantum mechanics | 3/27/2006 |
| Q: These are not homework questions. Level:grade 12th,16 yrs. 1.It was written in my book that "like s ... A: In graduate level physics courses, you will be able to solve the mathematical formulae that govern ... | |
| physics | 3/26/2006 |
| Q: what sort of device could be used to control the speed of a model electric train? A: I need a little more information to adequately answer this question. Model electric train sets I am ... | |
| WHAT WOULD HAPPEN IF YOU PUT... | 3/22/2006 |
| Q: WHAT WOULD HAPPEN IF YOU PUT SALT ON AN ICY SIDEWALK? A: You can get an answer on your own in two ways: 1) Take some salt and put it on half of an icy ... | |
| Wave Propagation | 3/10/2006 |
| Q: Suppose you have a transmission line (made with copper) with a rectangular cross section oriented ... A: You are most likely confusing two things: 1) power transmission by an AC current down a conductor. ... | |
| simple pendulum | 3/9/2006 |
| Q: It is said that for a simple pendulum,t=under root of L by g. While the pendulum is a lift which is ... A: In the frame of the free falling elevator, the pendulum will not return to its "mean" position, ... | |
| time | 3/6/2006 |
| Q: I've recently been in a debate with someone and basically I said that the big bang couldn't have ... A: Before we go ANY further, I want to emphasize that I will NOT be drawn into this philosophical ... | |
| Rainbow halo around a light source | 3/5/2006 |
| Q: Around here (Montreal, Canada) we have skiing resorts that stay open until 10:00 pm. The lighting ... A: > it seemed to have rings in colors of the rainbow The phenomena you saw is identical to the ... | |
| Magnetic Levitation of Tracked Vehicles? | 3/3/2006 |
| Q: Could a tracked vehicle, eg a tank, levitate? Perhaps by using magnets in the tracks and ... A: The device fails both on theoretical and practical levels. If the tracks with the permenant magnets ... | |
| Light Polarizor | 3/2/2006 |
| Q: I've just been told this: (which doesn't make sense!) "When verically polarized light is reflected, ... A: > I always assumed ... [when] light from the sun ... is reflected from a > horizontal surface, only ... | |
| normal force | 3/1/2006 |
| Q: I wonder if you could help me with a problem I’m having grasping the concept of the normal force. ... A: If you don't understand how one vector can be broken into two parts, then the following (indeed, any ... | |
| aiming | 2/23/2006 |
| Q: me and my buddy are trying to figure this out and now we want to see whos right so i wonder if u ... A: The fact that you are only having a friendly bet means that two people have an idea about the ... | |
| magnetism | 2/21/2006 |
| Q: A permanent magnet raises an iron nail vertically over a distance and work is done. I am trying ... A: I will do my best to explain but, ultimately, the answer will be "they do because they do." If that ... | |
| relationship | 2/20/2006 |
| Q: can you tell me if there is a future for me and my parnter of five years we have a son but it has ... A: > If you claim you are a physic > it seems to me you have not even taken time > and used your powers ... | |
| electric stove burner vs. gas stove burner | 2/17/2006 |
| Q: I have a smooth-top electric stove and it heats up incredibly fast. It glows red-orange when on ... A: There are several related, but independent questions here. I'll try to answer them all. The color ... | |
| Microwave | 2/14/2006 |
| Q: I have read somewhere that in Microwave oven the radio waves vibrate the water molecule and that ... A: > it is not the water molecule > but the molecules of the conductive substance vibrate > Am I ... | |
| Global Warming and waste heat | 1/4/2006 |
| Q: This is just for my curiousity. I think its pretty obvious we are affecting the planet somewhat. As ... A: Fortunately, the waste heat generated by our products is an infinitesmal amount of energy compared ... | |
| Interference | 1/2/2006 |
| Q: I have a question concerning interference. If I have a Michelson-Interferometer (that is: light ... A: If you do the calculation a little more rigorously (ie, calculating the exact change in the electric ... | |
| gravity | 12/20/2005 |
| Q: i need to know the basics of gravity can u help? A: Sorry it took me so long to respond. AllExperts.Com was down for the two days prior to my leaving ... | |
| Relativity | 12/16/2005 |
| Q: Good day!:D I was just wondering how an expert would explain the theory of relativity in a way that ... A: I did a Google{R} search for "special relativity" and got 2,830,000 hits. On the first page of ... | |
| Energy cannot be created or destroyed | 12/12/2005 |
| Q: Law of Conservation of Energy states: Energy cannot be created or destroyed. How can this be if a ... A: Matter is a form of energy. The energy in the matter destroyed exactly equals the energy released in ... | |
| transverse waves | 11/6/2005 |
| Q: why can transverse waves be thought of as two waves a wave in time and a wave in space? A: Because their vibrations can only be described as changing in both and space. If the direction of ... | |
| photons and fluorescence | 11/6/2005 |
| Q: I am retired, have an Associates in Electronics (1960), and have taken up mineral collecting and ... A: > Is the electron bouncing back and forth between orbitals? This is the most correct explanation. ... | |
| intermolecular forces and potential energy | 11/4/2005 |
| Q: If the intermolecular forces are attractive, how can it take work to keep them together. The forces ... A: My statement stands; namely, that the zero point of potential energy between molecules is when there ... | |
| intermolecular forces and potential energy | 10/30/2005 |
| Q: For a sample of some substance, internal energy is defined as the sum of three components: ... A: Molecules, when left on their own, will fly apart from each other. It takes work to get them to stay ... | |
| temperature change | 10/17/2005 |
| Q: You open the refrigerator in your room and put in a case of room-temperature root beer. After an ... A: Since the entire purpose of a refrigerator is to take warmer air from the inside of itself and send ... | |
| Planck's constant | 10/17/2005 |
| Q: When you use Planck's constant to do calculations on electromagnetic it shows that high frequency ... A: You are correct to note that each individual photon has more energy if it vibrates at a higher ... | |
| Newtonian vs. Relativity | 10/15/2005 |
| Q: Hey, My name is Scott and I have physics question. Before I begin I want to thank you for the time ... A: Your friend either totally misunderstands the nature of light or you are misunderstanding what he is ... | |
| Travel faster tha light | 10/14/2005 |
| Q: It is well known that nothing could travel faster than light (C) and also that motion is relative. ... A: Adding velocities by the proper relativistic formulae is not as simple as the one you used above (Vt ... | |
| Job | 10/9/2005 |
| Q: Will I get the job at Charlotte Russe? A: Note this a site for physics questions, NOT psychic ones. But if you're trying to be funny, note ... | |
| Question about Gravity | 10/8/2005 |
| Q: I am age 14. My parents took me to EPCOT at Walt Disney World last weekend. We went on a ride that ... A: What they told is flat-out wrong. Gravity did not change by any measurable amount while you were on ... | |
| leaks | 10/6/2005 |
| Q: Had some household plumbing that I tested for leaks. When pressurized to 55psig with air it leaked ... A: Pressure is the total force (per area) caused by the fluid's molecules hitting the container. As you ... | |
| question | 10/6/2005 |
| Q: My question isn't under your speciality, so if you don't want to answer feel free not to. I'd like ... A: > I'd like to know why do people say that when you jump > from a very high building you die before ... | |
| Motor burns out | 10/4/2005 |
| Q: What happens when a motor or transformer burns out? For example: If you hold the armature of the ... A: First of all, do NOT try to find out with an experiment! Motors or transformers burning out are at ... | |
| Tire/friction physics | 10/4/2005 |
| Q: A friend of mine, who is a bus driver, told me that in dual-tire situations, if one of the tires is ... A: Feel any tire after it's been driven awhile, and you'll feel its heat. That's from the friction of ... | |
| special relativity and adding velocities | 10/3/2005 |
| Q: According to the special theory of relativity, the correct way to add velocities is to use the ... A: You make a fundamental (but common) mistake right at the start of your question. You assume an ... | |
| Physics & The World of Teen Dramatic Tv | 9/19/2005 |
| Q: Okay. So my brother is watching a show. The show is Smallville. Have you seen it? The show is for ... A: I've never watched the show, but I am aware of it. And I was reading Superman{R} comics 45 years ... | |
| spinning roundabouts | 9/15/2005 |
| Q: why does someone on the edge of a spinning roundabout find it harder to hang on than someone at the ... A: Creating analogies between the physical world and humam culture is always a bad idea. As any good ... | |
| Logic Of The Science | 9/4/2005 |
| Q: I say , " The meaning of energy is depended on the meaning of mass ? " and I believe it's a ... A: I can only say, "Huh?" I have NO clue what thought you are trying to convey. Mass is one form of ... | |
| Realtivity and E&M | 7/11/2005 |
| Q: I am a university student who recently switched to physics. I have a decent background in classical ... A: > Who is right? Neither. Or both. Or either. Depends on what you define as "right." In your ... | |
| The accelerating universe | 6/25/2005 |
| Q: I'm in my 4th and final year of my physics degree, but not much of a relativist. A passenger in an ... A: First of all, you are correct in stating that force is required for MATTER to accelerate; ie, change ... | |
| work-energy principle in different reference frames | 6/21/2005 |
| Q: Is work_energy principle valid in all inertia reference frames with different speeds? For example, ... A: > Why the net work in different inertia reference frames are different? > How should this be ... | |
| boiling water | 6/20/2005 |
| Q: Expert, and thank you for answering me! I'll explain my questions. I'd like to understand what ... A: > what happens to the water molecules when water is boiled? > Do they release gas of some sort? ... | |
| boiling water | 6/19/2005 |
| Q: Don't worry, this is NOT a homework question. I'd like to know, what exactly happens, physically ... A: I'm afraid I'm having trouble understanding either of your questions. > what exactly happens, ... | |
| Microscopic Sound Waves? | 6/13/2005 |
| Q: I spend most of my days browsing the internet and trying to answer questions that I come up with ... A: Sound waves are basically groups of molecules vibrating in sync with each other. Molecules usually ... | |
| Bohm/Casimir | 6/8/2005 |
| Q: Question nr.1: This is supposed to be a practical aproach to David Bohm's holographic universe : ... A: > Question nr.1: > please tell me, if you can, how to get over this problem ? I have absolutely ... | |
| The direction of time | 6/3/2005 |
| Q: I am experienced to high school level in Physics and some electronics at College level. I am also a ... A: > Do you know about this theory? Never heard of it. However, your initial description of it shows a ... | |
| hologram | 6/1/2005 |
| Q: I hope you can explain to me the actual process of producing a hologram. I read that is an ... A: First of all, I assume you realize that there are scores of Internet sites that can explain ... | |
| Astro Physics | 5/29/2005 |
| Q: I apologies for over simplifying my question. The only thing that has happened is you reshaped my ... A: I'm not certain I understand exactly what it is you are proposing. If you want me to comment on ... | |
| Astro Physics | 5/28/2005 |
| Q: Couldn't the universe's accelerated expansion be explained by time space curvature? Could there be a ... A: > dark and other matter being forced (and eventually pulled) > to the end expanse the physical ... | |
| Magnetics | 5/12/2005 |
| Q: Could you tell me how these 3 units relate to each other: -Magnetic field intensity -magnetomotive ... A: I'll try to explain it without using your terminology, because I am not certain my understanding of ... | |
| fluffy | 5/11/2005 |
| Q: String theory states that photons are carryers of force. What is the nature of these photons (they ... A: > String theory states that photons are carryers of force I presume what you are saying is that, in ... | |
| charge | 5/9/2005 |
| Q: I have a simple question. What really IS 'charge'? I know a electron has negative charge and a ... A: Charge is the quality of an object that causes it to create a force with other charged objects. In ... | |
| classified | 5/3/2005 |
| Q: A couple of days ago, i saw on the Discovery channel a documentary about trains. It was not that ... A: This is absolutely PURE speculation, as I did not see the show and can get no information on it. If ... | |
| Dear Sir, I dont care if... | 5/1/2005 |
| Q: I dont care if you answer this or not but the question I asked was not a HOMEWORK question. I am an ... A: I regret that I have to repeat what I clearly stated on the page where you post your"I do not give ... | |
| LightSaber | 4/30/2005 |
| Q: I have been resaerching a real working lightsaber and was wondering if you think its possible.... A: No. Light, by definition, flies away from its place of origin at the speed of light. Thus there's ... | |
| Water freezing | 4/29/2005 |
| Q: I'm sorry if my english isn't that good, but I'll do my best to make myself understood. So, to ... A: Although I can't find any URLs to prove it, my GUESS is that water tossed into the air will not ... | |
| which interpretation of QM is the most popular? | 4/26/2005 |
| Q: I did not really think about there being more than one copenhagen. Anyways, i mean the copenhagen ... A: This URL should answer your question. It explains the matter 100 times better than I could hope to, ... | |
| question | 4/21/2005 |
| Q: Correct me if i'm wrong : in a false colour chamber photograph a gamma ray photon dissapears and in ... A: You are correct in two things: 1) gamma rays, being a form of EM radiation, travel at the speed of ... | |
| optics | 4/6/2005 |
| Q: I really do not understand why does half a wave (light) get lost when hitting a transparent medium. ... A: When you do the calculation for a wave (of any kind) going from one medium (like air) to another ... | |
| orbit 2 | 4/5/2005 |
| Q: If it's that simple than it's ok, but... what about the 9 planets orbiting the sun ? They should be ... A: > They should be in such a perfect ballance > that even a small meteor would destroy the entire ... | |
| orbit | 4/5/2005 |
| Q: Please expain this: is there a certain relation between the mass of an object in orbit and it's ... A: An object can only remain in circular motion if there is a centripetal force applied to the object ... | |
| Universe | 3/30/2005 |
| Q: Out of curiousity what's the Universe's chemical composition like and will it change 50 billion ... A: > what's the Universe's chemical composition ... | |
| Universe | 3/23/2005 |
| Q: The questions I last sent you were NOT HOMEWORK QUESTIONS! Was that hard to understand? I need to ... A: > Was that hard to understand? Not at all. What must be difficult FOR YOU to understand are my ... | |
| Electromagnetic wave range | 3/22/2005 |
| Q: I have read that lower frequency electrromagnetic waves travel further that high frequency waves... ... A: > have read that lower frequency electrromagnetic waves > travel further that high frequency waves ... | |
| nuclear fusion | 3/10/2005 |
| Q: I would like to know the status of fusion research. Has anyone actually performed the reaction, ... A: For questions like this, you'll get answers 1000 times better than I could provide by going to ... | |
| anti-gravity machine | 3/6/2005 |
| Q: could a centrifuge short loop, fight the effects of gravity, exspecially using a substance that can ... A: I'm not certain what you mean by "fight the effects of gravity" or why you think the nature of the ... | |
| Universe (questions to be on test) | 2/21/2005 |
| Q: This is not my homework! These are questions that are going to be on the test and I don't know ... A: Since you have not read my opening statement, which is clearly posted before you ask a question, let ... | |
| electrical spark phenomena | 2/10/2005 |
| Q: There are several electrical spark phenomena; lightning, electric arc light (also called klieg ... A: Whenever you see ANYTHING, it is photons entering your eyes that ultimately cause you to "see." The ... | |
| Universe and the Sun | 2/5/2005 |
| Q: My teacher told me that if the sun was twice as hot as it is now the energy that reached the Earth ... A: We can get SOMEWHAT of an idea of what would happen if the Earth were getting sixteen times as much ... | |
| subject meterial | 1/29/2005 |
| Q: sir I am Rajesh I want meterial on Physics for free downloaders can you suggest that sites . and I ... A: > I want meterial on Physics for free download If you do an Internet search, you'll find the ... | |
| static electricity | 1/26/2005 |
| Q: - Thanks so much for your very, very clear explanation! I'd like to follow up with one other static ... A: Your explanation is not quite correct. You go wrong in Step 4. The excess electrons that your shoe ... | |
| You didn't misled me - I didn't... | 1/23/2005 |
| Q: You didn't misled me - I didn't read the answer to the end. I sent this question to the experts in ... A: > There is microcameras. How big are the smallests ones? > Where they put / hide them? > Where they ... | |
| Thank you for the full explanation... | 1/23/2005 |
| Q: Usually experts answer one or two of all the questions I ask). From school lessons I thought that ... A: > From school lessons I thought that heat is infrared light I'm sorry if I misled you: radiated ... | |
| static electricity | 1/20/2005 |
| Q: I rub a plastic pen on my shirt to charge it, and can then use it to pick up bits of Kleenex. ... A: I don't know off-hand if rubbing a pen creates a negatively or positively charged surface. I'm going ... | |
| What is generally infrared... | 1/18/2005 |
| Q: What is generally infrared light? Is it like tv signal? Could it be stopped with a wall? A: Bear with me as I give a full explanation. Watch a coal as it comes out of a fire. When it's so hot ... | |
| ultrasound and whales | 1/14/2005 |
| Q: I heard that fishermen can use ultrasound as a bait to attract whales, since whales use ultrasound ... A: I know nothing about this, and a Google{R} for this topic found nothing remotely like what you ... | |
| Is it OK to use mass of magnets as a controlled variable in an | 1/5/2005 |
| Q: I am doing a science fair project with magnets. I have found two different magnets but they have ... A: As I made very clear in my notes prior to your asking this question, I don't assist in academic ... | |
| radio carbon dating | 12/31/2004 |
| Q: I don't know if this question should be for an anthropologist or a physicist but: Can radio carbon ... A: Radio carbon dating can tell you how long a previously living object has been dead. It is not used ... | |
| Charge | 12/27/2004 |
| Q: How do some charged objects interact with each other differently from the way a charged object ... A: Think about the most basic law of electricity; Coulombs Law. It states that, to get the size of the ... | |
| Dark Energy | 12/27/2004 |
| Q: I'm sorry for bothering you so much. But I see your point (and the mystery) now. A car going ... A: > Is it just expanding and has no force > or is it expanding because there is a force? Now you're ... | |
| Dark Energy | 12/27/2004 |
| Q: What about that: The initial condition is 60 kph (force I). But gravity slows it down to 40 kph ... A: > As it expands the effect of gravity gets smaller > speeding the car up to 55 kph If a car went ... | |
| Dark Energy | 12/27/2004 |
| Q: What I wanted to say is that I don't find the fact that the rate of expansion is increasing that ... A: > If the driving force of the expansion of the universe Now you see the problem. We don't KNOW what ... | |
| Dark Energy | 12/26/2004 |
| Q: I recently came across the following article: The results of the WMAP mission and observations of ... A: All matter in the universe (actually, the universe itself) is moving away from each other. The ... | |
| Gravity | 12/25/2004 |
| Q: HAS GRAVITY IS PULLING DOWN WHERE DOES IT GO.WHAT I MEAN IS AS IT IS PULLING ... A: I'm going to presume you're asking something along the lines of "Where does gravity go as it's ... | |
| Gravity | 12/24/2004 |
| Q: Why couldnt gravity be the equal reaction of any spere or body in motion.Newtion does say ... A: Your spelling and grammar are so bad that I can't determine what exactly it is that you're asking. ... | |
| Black holes | 12/23/2004 |
| Q: Does a black hole have two openings. A: I'll answer both the question you're asking AND the question I think you meant to ask. Black holes ... | |
| Time travel | 12/17/2004 |
| Q: If a spaceship is traveling at the speed of light and time is slowing so say ... A: First of all, let's change your question to "spaceship is traveling CLOSE to the speed of light". ... | |
| Breaking glass | 12/9/2004 |
| Q: I was wondering what is the decibel level to break glass? Can humans hear the sound or is it on the ... A: When you strike a solid object, it might ring with a tonal sound. The frequency of that sound is ... | |
| compressed air | 12/5/2004 |
| Q: A 40 cf oxygen tank filled with compressed air lets say 1500 psi with a regulator at 125 psi will ... A: > 40/8=5 am I missing something here? Yes. Remember that the regulator is rated at 8 cfm at 125 ... | |
| Half-life | 11/29/2004 |
| Q: I would like you to describe to me on the details on the experimental method used by Ernest ... A: Strange. When I did a Google{R} search for rutherford soddy half-life I got dozens of links, ... | |
| Interference of sound | 11/29/2004 |
| Q: Suppose that sound waves are generated by a loudspeaker in front of a metal plate. The real source ... A: > For sound wave, the metal plate should be a less dense medium than air > Hence the reflected ... | |
| Static electricity | 11/24/2004 |
| Q: We have problems with static electricity discharges around the office. Touch the the filling cabinet ... A: I've never done any experiment on this, but you have a real incentive to do so. Have one person ... | |
| Magnetic and Electric Fields | 11/22/2004 |
| Q: I was studying the hand rules of physics. I am wondering, if a magnetic field is circling a current ... A: I've gotten out my old physics books and can best describe it with the following diagram: .....< .. ... | |
| potential energy | 11/22/2004 |
| Q: I have two questions on potential energy. (And thank you again for your recent asistance.) 1. Is it ... A: 1. The potential energy of an object between two points is the amount of work needed to move that ... | |
| theory about active observer | 11/20/2004 |
| Q: Please help! Do you know the name of a scientific theory that relates to the principle of when ... A: There is no such theory. However, it is a scientific fact that there is a limit to how well you can ... | |
| Snow flake (model gravity | 11/18/2004 |
| Q: My question is more of a hypothesis. Can a Snowflake tell us about the process of gravity? A snow ... A: I almost put "There is no question here." I am unable to determine what it is you're talking about. ... | |
| physics and poker | 11/18/2004 |
| Q: -- ----------------------- Sincere thanks for your quick response. My thought was to have these ... A: > Is there anything that would give off a "glow" I can think of two possibilities, NEITHER of which ... | |
| physics and poker | 11/17/2004 |
| Q: Though it's defintely not homework, you may want to pass on this. I write mystery suspense novels ... A: Different radioactive isotopes have different products as they decay. Some emit alpha particles, ... | |
| electricity | 11/11/2004 |
| Q: I sent you a question yesterday which was rejected as a "homework question." I realize now (and I ... A: It has been my experience that any question involving the calculation of numbers is a homework ... | |
| Valve | 10/25/2004 |
| Q: Ok, know bernoulli's equation 'says' if you reduce the cross sectional area, you will increase the ... A: I thought I could answer this question in less than a minute, but while trying to write out an ... | |
| sea waves | 10/21/2004 |
| Q: How exactly is electricity generated from energy of sea waves(please say an online refference) A: The quickest and best way to get an online reference that best suits your needs is to do an Internet ... | |
| electricity | 10/20/2004 |
| Q: if you send different currents through a plant, will anything happen to the plant? A: I would have SWORN I had already answered this question, so I apologize for a seeming delay in my ... | |
| HELP ME | 10/6/2004 |
| Q: can u tell me some observation that led people of galileo's time to believe that heavier objects ... A: > can u tell me some observation that led people of galileo's time > to believe that heavier ... | |
| Piezoelectricity | 9/29/2004 |
| Q: this is not the most in-depth question, but here goes. I have to do an article about a new material ... A: I have never worked with piezoelectric generators, so I have absolutely no idea how much power they ... | |
| Trying to solve a mystery | 9/24/2004 |
| Q: Last night, as my wife and I drove into our carport, we noticed that the clothespin bag hanging from ... A: First of all, there's no way I can give an absolute answer without being at the location and using ... | |
| Linear Motion | 9/20/2004 |
| Q: Greetings! Let me first thank you for donating your time. Let's consider that a spacecraft ... A: The best way to explain the difference between "displacement" and "distance travelled" is to think ... | |
| travel | 9/16/2004 |
| Q: You've helped me many times and I've always been very pleased. This subject may not be exactly in ... A: Two separate issues here. The first is what constitutes a "straight line." As you correctly note, ... | |
| Motion | 9/14/2004 |
| Q: Why is it that if you are inside a train travelling at 60mph and you jump, you will land in (near ... A: Try this experiment to find out the difference. While inside a car moving at 100 kph with the ... | |
| Circuits | 9/10/2004 |
| Q: My Friend showed me a simple circuit - just two bulbs conected in series to a power supply. When ... A: The brightness of a bulb depends (amongst other things) the electrical energy being turned into ... | |
| food science | 9/8/2004 |
| Q: Followup To Question -Followup To Question - what cools down faster a solid food in the open or a ... A: > I WHOULD REALLY BE THANKFULL IF U COULD FIGUER IT OUT 4 ME I have been trying since the start of ... | |
| food science | 9/7/2004 |
| Q: Followup To Question -what cools down faster a solid food in the open or a cup of hot liqu. Answer ... A: > ok well mostly i tryed vegtables like potaos waiting to hear from u Allow me to presume that you ... | |
| food science | 9/5/2004 |
| Q: Followup To Question - what cools down faster a solid food in the open or a cup of hot liqu. ... A: > trying to see if there is one formula to figure it always out There probably isn't one formula ... | |
| food science | 9/3/2004 |
| Q: what cools down faster a solid food in the open or a cup of hot liqu. Answer - Why not do an ... A: I'm not certain why you are not getting a good result. Why not describe to me EXACTLY the following: ... | |
| help! | 9/3/2004 |
| Q: This is not a homework problem, just a practice conceptual question that seems really simple but ... A: You are correct in your basic assumption. The velocity of either object (indeed, any object in ... | |
| Gunpowder | 9/1/2004 |
| Q: I do not know if you could answer this question but what would happen if you were to dip your tongue ... A: Oftentimes when someone asks a question like this I recommend s/he do an actual experiment. THIS IS ... | |
| question | 8/30/2004 |
| Q: is it possible to build a train to have similar principal as that of the maglev train but use ... A: > is it possible to build a train to have similar principal as that of the maglev train > but use ... | |
| television | 8/29/2004 |
| Q: Why is television bad for you? How far should you sit from a TV A: > Why is television bad for you? I'm going to assume you're asking ONLY about the biological ... | |
| Transferring Energy | 8/24/2004 |
| Q: First of all, Im not asking for help on homework as I have already done the assignment AND it has ... A: The energy was transferred to heat. The bubble wrap was indeed compressed as the box hit the ground, ... | |
| ULF and VLF radio waves | 8/22/2004 |
| Q: Will ulf and vlf radio waves penetrate anything? Or is there something that will shield them? A: This link will probably explain it better than I could ever hope to. ... | |
| electromagnet | 8/19/2004 |
| Q: I no that you make an electromagnet by running current though an coil of wire but i was wondering ... A: There IS an answer to your question but, unfortunately, it's not one that can be explained easily. ... | |
| What happens if... | 8/2/2004 |
| Q: What happens if an unstoppable force meets an unmovable object? A: The science of physics recognizes neither unstoppable forces or immovable objects. A force has a ... | |
| absorption coefficient of ground glass | 8/1/2004 |
| Q: Can you please tell me the general equation of absorption coefficient of ground glass(or glass slab) ... A: A Google{R} search for "absorption coefficient" glass colored resulted in a link to a PDF site ... | |
| spin of objects | 7/20/2004 |
| Q: both on the macro and micro size, when object "fall" towards one another, do they -even in a vacum- ... A: I'm not sure what you're asking for here. The gravitational attraction between two objects simply ... | |
| phylosophy | 7/15/2004 |
| Q: I was told by a friend that you do answer question, so my question goes like this "whatis this ... A: > whatis this phylosophy on metal physics all about I am not aware of any special philosophy ... | |
| Physics | 7/12/2004 |
| Q: Let's say I had some sort of futuristic super dense material and I constructed a rod out of it that ... A: For thought experiments, it's best to do order of magnitude calculations. The distance from the ... | |
| Physics | 7/11/2004 |
| Q: I mean.. If you put a air-filled ball deeper into the water, the ball will receive more bouyancy. ... A: > A floating subject is pulled down by gravity. and at the same time, > the subject receive ... | |
| Physics | 7/11/2004 |
| Q: Suppose that you put an air-filled ball into the water and release it so it break the suface of the ... A: > if the bouyancy is bigger, the jumping height is higher? I don't know what you mean by "jumping ... | |
| Physics | 6/20/2004 |
| Q: What are the advantages and disadvantages of using the length of your arm for a standard length? A: This is not a question I have given any thought to. However, it is obviously something of interest ... | |
| phylosophy | 6/19/2004 |
| Q: I was told by a friend that you do answer question, so my question goes like this "whatis this ... A: Your question seems to be "What is this philosophy on matel physics all about?" Although I can ... | |
| U235, chain reactions, and radioactive decay | 6/1/2004 |
| Q: Is antimatter strictly anti-particles, so that 1 anti particle cancels another, or do these ... A: > Is antimatter strictly anti-particles, so that 1 anti particle cancels another, > or do these ... | |
| U235, chain reactions, and radioactive decay | 5/31/2004 |
| Q: I see. That web site helped me a lot, Thank you. Can you explain antimatter? I understand that it is ... A: > how could energy be given if all that was, becomes nulled? I'm not certain I understand this ... | |
| U235, chain reactions, and radioactive decay | 5/30/2004 |
| Q: Excellent. Under which examples does E=mc^2 account? Thank you so much.So you say that the decay of ... A: > Under which examples does E=mc^2 account? In any decay process where the number of hadronic ... | |
| U235, chain reactions, and radioactive decay | 5/30/2004 |
| Q: So you say that the decay of atoms has a MEASURED result, while we don't know WHY it has that ... A: > What must the rules of thumb be in order to know which SHOULD/COULD do In a sense we do have a ... | |
| U235, chain reactions, and radioactive decay | 5/30/2004 |
| Q: My first questions is, why does U235 separate into Kr92+Ba141+3*n+x*Gamma when struck with a ... A: > I guess I should have just asked how all the decays work That does seem to be your fundamental ... | |
| Mass Quanta | 5/25/2004 |
| Q: I know that there is a quanta for length and time (planck's length and planck's time) but is there a ... A: I am not aware of any such minimum mass. Physicists have generally found that, when you create a ... | |
| gravity with quantum constants | 5/7/2004 |
| Q: Moataz Emam,Physicist/String Theory also replied saying that it all boiled down to classical gravity ... A: All three of my original responses still stand: 1) their STILL is no justification for your ... | |
| gravity with quantum constants | 5/6/2004 |
| Q: Can you please comment on the below. It arrives at g using quantum constants. Critical feedback is ... A: One thing is VERY noticably lacking in this: a complete lack of any justification of the process. ... | |
| orbit insertion | 5/6/2004 |
| Q: regarding my question on orbit insertion, altough you did not know the answer, I wanted to ask you ... A: Okay, now I get it. In order to send a satellite (actually, any object) to a planet, that object has ... | |
| orbit insertion | 5/6/2004 |
| Q: You've helped me before and I was very satisfied with your answers, so here is a question more for ... A: Off the top of my head I cannot think of any reason why sending a probe to an inward planet would be ... | |
| energy conversion | 5/3/2004 |
| Q: In how many ways can energy be converted? and how is it converted? How does the subject matter go ... A: > In how many ways can energy be converted? The number ways energy can be converted from one form ... | |
| rubber band powered car | 5/1/2004 |
| Q: Could you tell me a website that has diagrams on how to make a rubber band powered car, or if you ... A: I really have no idea which sites exists for this, and would have to run a search to find such URLs. ... | |
| Pulleys | 4/29/2004 |
| Q: I am building a pyramid set up out of wood to install a fountain. The heaviest part is anywhere from ... A: > best to use and if my design is the right one Whether any system is "the best" or "the right one" ... | |
| Planets | 4/26/2004 |
| Q: Why don't the planets ever fall out of orbit? What are some of the books you would reccomend for ... A: > Why don't the planets ever fall out of orbit? I'm going to presume you mean the planets of our ... | |
| ammonia and methane in greater gravity planet | 4/20/2004 |
| Q: This is for a sci-fi novel I'm writing. A planet, 1.5 times the diameter of earth, with same earth ... A: > will such a planet hold more ammonia and methane gases in the atmosphere Actually, the Earth ... | |
| cooling water | 4/13/2004 |
| Q: Dose in water cooling by refrigrator,the warm water is colded faster than cold water?why? A: I presume your question is which of these -- cold water or warm water -- is chilled more quickly ... | |
| Concave Lens? | 4/12/2004 |
| Q: I asked about a lens on ebay before. You advised if it caved in in the middle, it was concave. I'm ... A: A lens that bulges outward on one side and bulges inward on the other is neither a convex lens nor a ... | |
| electronics | 4/11/2004 |
| Q: I'm building a toy remote control car (about 12"x6")one wheel at a time, one gear at a time. ... A: > do you know where I can buy these electronic parts alone > without having to buy the whole car On ... | |
| Physics | 4/5/2004 |
| Q: How do electrons not bump into each other in a valence shell surrounding an atom? several electrons ... A: > do all the electrons in one shell occupy a single orbit > (sphere around the nucleus)? First of ... | |
| Physics | 4/5/2004 |
| Q: How do electrons not bump into each other in a valence shell surrounding an atom? several electrons ... A: When you get down to the size of atoms and electrons in our universe, things become different from ... | |
| Plank's Length | 4/3/2004 |
| Q: 1.Planck's length is the quanta of distance why isn't the quanta zero in other words my question is ... A: My apologies. I wasn't sure what exactly what your question was, so I answered what you asked me. ... | |
| sound | 4/1/2004 |
| Q: I am an artist who is looking to create and environment such as a room in which upon entry the ... A: In my judgement what you seek is not possible. Once air vibrations of an unknown frequency and ... | |
| Plank's Length | 4/1/2004 |
| Q: Why isn't planck's length zero metres? A: This is the equivalent of asking "Why doesn't 2 + 2 = 5 ?" The answer is the same in both cases: ... | |
| Moon Missions | 3/31/2004 |
| Q: OK My Friend, Let me start this off by apologizing for any pot shots taken at your expertise and ... A: Even though you do not want to deal with what I specifically stated is the only question I can ... | |
| Moon Missions | 3/30/2004 |
| Q: My Friend, I don't appreciate your taking "shots" at my personality or my view point, just because ... A: I have a bad feeling I know where this discussion is heading. You will ask questions I have not ... | |
| thermodynamics of an engine | 3/30/2004 |
| Q: I have a question that I would like help understanding. It occurred to me when I was driving to ... A: > In other words, why does an engine that is producing mechanical energy, > produce less heat than ... | |
| Moon Missions | 3/30/2004 |
| Q: I have seen the badastronomy web site. It is one of the ones that leaves the thinking person with ... A: > Have you, yourself, done any research on the topic of the moon landings, > or did you answer ... | |
| Moon Missions | 3/29/2004 |
| Q: I have been studying the debate over the Apollo Moon Missions that were flown from 1969 to 1972. ... A: I'll answer the only question you asked. > Did Mankind actually land men on the moon and return ... | |
| reference frames | 3/29/2004 |
| Q: I am trying to understand what a reference frame is. I have looked through several texts and found ... A: > It appears to me that a reference frame is a three-dimensional > set of coordinates (like a set ... | |
| Mass Converted to Energy | 3/26/2004 |
| Q: I saw your profile and thought you might be able to answer a question I had on physics: Are mass and ... A: The correct statement is that matter is a form of energy. It is not quite correct to state that ... | |
| Weight | 3/26/2004 |
| Q: What is the heaviest known substance (element) in the universe; and, in theory, if an amount the ... A: It took longer than I would have preferred (about ten minutes), but a Google search for "heaviest ... | |
| glass | 3/25/2004 |
| Q: ... My question is with all these billions of atoms that need to be negotiated by the photon, ... A: > photon must ... meet head on with the nucleus of an atom, > if that happened the photon would be ... | |
| glass | 3/25/2004 |
| Q: Can you please explain to me how light can pass through a solid such as glass, I read recently that ... A: You have the right idea about the number, although it's a bit conservative. At a thickness of one ... | |
| nuclear bomb | 3/22/2004 |
| Q: what causes the mushroom cloud on a nuclear bomb? is it the hot gases expanding and going upward in ... A: Ten seconds after I did a Google search for +"mushroom cloud" +why I got this link, which explains ... | |
| door | 3/21/2004 |
| Q: why is it difficult to open the door by applying force near the hinges A: To get something to rotate (like a door, or a wheel on an axle), you need to apply torque. Torque is ... | |
| Scientific (maybe) help please. | 3/19/2004 |
| Q: My grandson has made a bet with me that I can't find the answer to this question, on the internet. ... A: This MIGHT be part of a joke I heard about twenty years ago. After scientists built a computer that ... | |
| About ions | 3/17/2004 |
| Q: want to ask something about ions. Oxygen in the air contains ions. My question is where exactly ... A: > where exactly do the ions exist? > Does they exist in the atoms of the oxygen? Yes, but also in ... | |
| rollercoaster question | 3/16/2004 |
| Q: Subject: Timberland Twister - A Question of Physics? > This is a great question from a friend of ... A: Since I'm not 100% certain how the Timberland Twister works, nor what strategy you employ to ... | |
| Which glass cleaner works... | 3/14/2004 |
| Q: Which glass cleaner works the best on glass? A: I'm uncertain (1) what my choices are, (2) how you define "best," and (3) what the answer would be ... | |
| pics | 3/10/2004 |
| Q: This is perhaps more of a space/astronomy question, but you've helped me before and I was really ... A: I don't know if it would "leave us speechless," but it would be just as impressive as some of the ... | |
| my 12 year old daughter asked... | 3/9/2004 |
| Q: My 12 yaer old daughter (homeschooled) asked why exactly two objects of the same size but differant ... A: This is a good question; I hope you can bear with me. In the most basic sense, the "mass" of an ... | |
| physics | 3/8/2004 |
| Q: I have a toy car. If the diameter of the tires increase will the car speed also increase? If so, is ... A: I'm going to give my best answer: It might work, or it might not. Not the answer I WANT to give, ... | |
| physics | 3/7/2004 |
| Q: I have a toy car. If the diameter of the tires increase will the car speed also increase? If so, is ... A: I'm uncertain what you mean by 1) what kind of "toy" car you mean. I can imagine a toy car being ... | |
| electricity:watt amplification | 3/5/2004 |
| Q: Can one or why can't one amplify watts as voltage can be amplified? Answer - Two questions to think ... A: > The worst way to answer a question > is with another question In 35 years of assisting people ... | |
| Physics? or Ghosts? | 3/5/2004 |
| Q: my name is Jean and I have a question for you. Now I know that this is the Physics category for a ... A: Creaking noises in a house are so common as the house "settles" or is moved by the wind that a ghost ... | |
| Electricity | 2/27/2004 |
| Q: My question is from electricity and it is as follows: - # Consider a simple circuit of a battery, ... A: > where do these electrons come from? > Is it from the battery? In a sense, yes. Remember that the ... | |
| Sir Isaac Newton | 2/22/2004 |
| Q: What would you consider to be a greater accomplishment, creating calculus, or coming up with the 3 ... A: Why not explain your opinion, and then we can talk over this topic. Since you are the one who has ... | |
| Conservation of Energy | 2/17/2004 |
| Q: Sorry for troubling you I understand that no wave = no energy, but where does the energy of the ... A: I'll say it one last time. You keep saying "There are two waves, each containing energy." This is ... | |
| Conservation of Energy | 2/16/2004 |
| Q: But if two waves add up to have destructive interference exactly then how does it account for ... A: Your own question answers it. > add up resulting in 0 If the TOTAL of the two waves is zero, the ... | |
| Conservation of Energy | 2/16/2004 |
| Q: I have two sine waves of opposite polarity (or for that matter any waves or same characteristics but ... A: If two waves of opposite polarity exactly cancel each other out, then what do you have? By ... | |
| Second Length | 2/16/2004 |
| Q: "Second" is probably the basic unit of time. I have a question. Why the length of a second is "One ... A: The history of which units we use to designate measured events is actually quite fascinating. ... | |
| radio | 2/14/2004 |
| Q: I watched a DVD called "Life Beyond Earth" and in it the narrator shows how our radio broadcasts are ... A: > how can a radio wave possibly travel that far > without degradation The answer is simple -- it ... | |
| physics | 2/13/2004 |
| Q: How and why does the weight or length of a pendulum affect the swing? A: Here's a simple way to tell. Make a pendulum by tying a key or some other metal object at the end ... | |
| Re: about breaking a glass | 2/10/2004 |
| Q: Expert, I hear that you can break glass with your voice by hitting the right note? Is this true? ... A: This link should explain it. www.physlink.com/Education/AskExperts/ae479.cfm Note that it's not ... | |
| Moving Fast | 2/9/2004 |
| Q: I am ten years old and I hope I'm not wasting you time with thisIn the movie "Clockstoppers" the ... A: Good question! And I'm going to answer it in a typical way: "It depends." As you are probably ... | |
| ants | 1/29/2004 |
| Q: I have wondered this for a long time, but how exactly is it that an ant (or most tiny insects) can ... A: There was a film in high school physics class that gave insight into this; I'll do my best to ... | |
Physics
Answers by Expert:
Expert
Top Expert on this page
Expertise
I can help with understanding physics that does not involve eggs. I will NOT help with academic or professional questions, which are NOT limited only to homework. Please do not waste your time by asking a question that comes out of ANY kind of academic, professional, or business matters.
Experience
Have been fascinated by physical laws ever since I learned, at age seven, that magnets work under water. My study continued through college and has not ceased even after I retired.
Education/Credentials
B.A. in Physics (with honors) from University of California at Berkeley.M.A. in Physics (with honors) from University of Texas Austin.
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