| Subject | Date Asked |
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 > ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 -- ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| "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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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) ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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. ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 -- ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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? ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| "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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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" ...
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| 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 ...
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| 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 ...
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| "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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| "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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| "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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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? ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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? ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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". ...
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| 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 ...
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| 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: .....< .. ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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. ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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" ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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