What is produced: Definition and 297 Discussions

Homework Statement calculate the pressure (in Pa) produced by a 2 N force distributed over an area of 0.02 cm^2 Homework Equations P=F/A The Attempt at a Solution Ive came out with three different answers.

Is there a practical utility to derive the electric field produced by a charged rod (and the 1/r dependence at great distance)? I know it can be useful to derive the electric field produced by a large plate since you can then show that the field between close parallel plates that are oppositely...

Homework Statement 5.0 g of Zn is heated with an equal amount of S, bow much zinc sulfide is produced? Homework Equations The Attempt at a Solution Wouldn't there be an equation to solve this problem? I know law of constant composition is an observation that the elemental composition...

So I'm not asking if thermodynamics has, but specifically statistical mechanics, because it seems so unlikely that by probabilistic and mechanical reasoning, the phenomenon of self-organization would arise -- and if it has happened, I'd love to find out. I'm not looking for specific papers, as I...

I don't know how Electricity is able to conduct light, please be detailed. Liht Bulbs Incandescent bulbs I just wonder how electricity flows through the Tungsten wire (why is the wire tungsten) and can cause light to be emitted.

I,ve noticed that when I fire a rifle that my left ear feels the most damage were my right ear feels allmost no damage. How can that be when my right ear is closest to the rifle chamber? I am right-handed.

The average energy needed to produce an ion in air is 34eV, how many ions pair will be produced in air by a radiation of 1MeV, my teacher told me it is about 30,000 ions and electrons but can someone please prove it??:confused:

In consideration of a lone wire element of differential length dL carrying a current I: Two things concern me here: 1) Is a magnetic field generated by current I really limited to only spaces that exist orthogonally to the line between the two ends of the wire element? If not, what does...

Homework Statement Why does an IC engine generate about the same maximum torque over a range of engine speeds but the maximum power at only one speed? Homework Equations None. The Attempt at a Solution For max power, the best I can come up with is that since torque does not drop as...

HI, I want to know how seismic waves are produced?. I cannot find any information on it on google. Any help will be helpful. Thanks.

Lots of articles and papers I read talk about the gamma rays produced during fusion reactions. And yet, when I look at equations for fuel cycles, the sum of the energies of the fusion products equals the total energy liberated. Since this implies that all of the energy released in the fusion...

I am not quiet sure where should i post this question, so forgive me if i asked this question at the wrong place. Now my Question is that how can an intensely thermochemical process like burning of a fuel produce, something like light which is a electromagnetic wave ?

I am not quiet sure where should i post this question, so forgive me if i asked this question at the wrong place. Now my Question is that how can an intensely thermochemical process like burning of a fuel produce, something like light which is a electromagnetic wave ?

please reply me i have a doubt. if two jet planes are flying together each producing 130 db sound. then what is the level of loudness heared by a person standing there. no other parameters are known. I have two concepts in mind ie) 1. every fundamental frequency produce hormonics and when two...

John Davis April 23rd, 2010 Rotterdam – A new project has discovered a surprising result considering the ability to plan forward in a short period. Always being too late does not only have to do with your manners, but the gender has the most influence regarding coming on time. A recent...

Homework Statement The diagram attached shows a metal wire stretched between two supports P and T which are 4x apart where PQ=QR=RS=ST=x . Three small pieces of paper are placed at positions Q , R and S . When the wire is vibrated at a certain frequency , the small piece of paper at R...

Is magnetic field is produced by uniformly moving charge?is it affect it,s magnetic field? Is Magnetic field of charge is due to relative motion?

Greetings Physics Forums! This is my first post. A physical phenomena that I know for a long time is that when an atom (let's say hydrogen) has an electron that make a quantum jump from a higher energy state to a lower it emits a photon. Suppose the hydrogen atom is isolated from the external...

What kind of errors would be produced by "excess" taq in PCR? Not sure if this belong in the Homework section. Put it here since it's not homework. What kind of errors will I get by adding 6.75µL taq pol to +50µL of cDNA? The master mix will be added to the cDNA resulting in an excess of taq...

Homework Statement Pacemakers designed for long-term use commonly employ a lithium-iodine battery capable of supplying 0.42 A*h of charge. b) If the average current produced by the pacemaker is 5.6 uA what is the expected lifetime of the device? Homework Equations C = A/s The...

Hi there, To start off with, I'm not sure if this is the right section or not, so if it is the wrong section could a mod please move it for me? Sorry! I'm curious to see if there is a way one would calculate the energy produced by triboluminescence. Like for example the amount of energy...

http://img192.imageshack.us/img192/9421/31387291.png I know that the magnetic field coming off the wire will be directed in a circle counterclockwise around the wire. So, from what I understand, it would work something like this: http://img709.imageshack.us/img709/1880/70281684.png...

Two charges are separated by 1.0 m. Q1 has a negative charge of 4.2 µC and Q2 has a positive charge of 1.4 µC. At what position is the net electric field that is produced by both Q1 and Q2 equal to zero? Extra Credit: If a +5.0 µC charge is placed at this position, what force would act on it...

Dear all, As I understand the venturi effect, if a flow of water passes through a constriction, its velocity increases and its pressure decreases at the restriction. The decrease in pressure allows a suction force to be produced. I am trying to use this principle in order to power a vacuum...

Homework Statement An oxygen molecule vibrates so that the distance between its intramolecular bonds changes from 1 Angstrom to 3 Angstrom. This change occurs 1000 times every second. If the average speed of the movement is 100 m/s, and the weight of the molecule is 10^-26 kg, how much...

Hello, I have an idea to generate electricity using piezoelectric material. I entered this in a contest and my idea got selected. Now I have to prepare a detailed presentation of the idea for which I need to figure out approximately/roughly how much electricity will be produced. I am a layman...

Homework Statement In the following diagram, why not 6 images are produced? Explain thoroughly. And mention the amount of images produced. Problem Image: http://img691.imageshack.us/img691/8315/imageproduced.jpg or http://file15.9q9q.net/preview/92743229/Image-Produced.jpg.htmlPlease...

Hi, Got what seems like it should be a basic particle physics problem that I can't quite get my head around, I could do with some guidance. Here's the problem: I have electrons with 4GeV energy striking target protons and producing some neutral particle Q. I'm supposed to calculate the...

Homework Statement Gasoline consists primarily of octane, C8H18 Calculate the mass of CO2 produced from the complete combustion of 3.79 L (1.00 gallon) of gasoline (assume octane, density = 0.756 g/mL) with excess O2 The Attempt at a Solution The balanced chemical formula would be: 2C8H18 +...

Anyone know of a company that can make affordable production of Microelectromechanical systems (MEMS) designs?

if an electron is accelerated by 2eV energy. then what will be the wavelength of emw produced? can we use E=hc/wavelength here? should we use always de broglie hypothesis for this? what will be the difference between wavelength of electron and wavelength of emw? are they same or not?

http://img22.imageshack.us/img22/1958/physicsl.jpg My attempt, After all the integrals I've got the final equation (1/4piE0) * |q| / ( d * sqrt ( d^2 + (L/2)^2) ) i'm not too sure how to express it how the question asks, please help! the bit I'm confused on, is the ( d * sqrt (...

Right. Here's how it is, in the past I measured approximate laser power output using diffused LEDs of similar colour wavelength as the laser I was measuring. A multimeter across the terminals showed a current which was proportional to the power of the laser. I once asked my physics teacher...

Homework Statement Diverging lenses produce a "virtual" image, which can be seen but can't be projected, and converging lenses produce a "real" image which can be projected but not seen. How come we can see the image produced by a converging lens, which is supposed to be a real image...

A box 80.0N is to be pulled across a smooth horizontal floor with a force of 20.0N at an angle of 60 degrees to the horizontal. What acceleration will be produced? I know this probably seems simple, but I have searched my lecture notes, my textbook and the web but I can't find out how to...

Homework Statement In the figure below, positive charge q = 7.81 pC is spread uniformly along a thin nonconducting rod of length L = 12.5 cm. What is the magnitude of the electric field produced at point P, at distance R = 6.00 cm from the rod along its perpendicular bisector?Homework...

Hey, I am doing a question for a physics assignment, and it asks me to find the "wavelength of radiation produced by a proton in a cyclotron with a radius of 0.500 m and magnetic field with a magnitude of 0.200 T." Unfortunately the textbook doesn't give me an equations that have anything to do...

Homework Statement In Niels Bohr's 1913 model of the hydrogen atom an electron circles the proton at a distance "R" with a speed "v". Compute the magnitude of the magnetic field that this motion produces at the location of the proton. Homework Equations Bio Savart B = mu*I / 2R =...

Homework Statement A power line carries a current of 95 A along the tops of 8.5 m high poles. What is the magnitude of the magnetic field produced by this wire at the ground? How does this compare with the Earth's field of about 1/2 G? Homework Equations B= uo\mu/2\piI/r The...

Hello, I have measurements of the sound intensity produced by a sound source for a given frequency (*). These measurements were taken on on a grid on an imaginary sphere around the source. From these measurements it is clear that the sound intensity is not equal in all directions. The...

Homework Statement A small object A, with a charge of -2.78x10^-10 C, creates an electric field. At a point P located 0.250 m directly north of A, the field has a value of 40.0 N/C directed to the south. If a second object B with the same charge as A is placed at 0.250 m south of A (so that...

Hi I need help with a Stoichiometry problem. I am complete lost. I don't know where to start, or how to to solve. 2H2 + O2 -2H2O. I know the formula balances and that is it. The questions is How many grams of H2O are produced when 2.5 moles of O2 are used? Thanks!

how can i determine how many amps are generated by a typical automobile engine? how many amps can i suck off of a car battery while the car is running, and not slowly drain the battery of its power?

[b]1. This problem is part of an engineering model I am working on for a class. I am ultimately trying to model the torque applied to a bottle as a function of the static/kinetic coefficient of friction between it and the rubber cone it is being torqued by (The reason for this being bottle caps...

Homework Statement The explanation of this problem is long, but it shouldn't be too hard to solve. I'm just stuck. Obtain a symbolic expression for the magnetic field vector B(0,yp,zp) produced at the point (0,yp,zp) by an infinite line current that lies along the x axis. The steady current I...

Homework Statement What mass of Au is produced when 0.0500 mol of Au2S3 is reduced completely with excess H2? Homework Equations The Attempt at a Solution .100 mol Au3+ x 197/1 = 19.7 g 19.7 g is apparently wrong though according to the book; what am I doing wrong?

Homework Statement 4Fe+3O2=2Fe2O3 deltaH=-1.65 x 10^3kJ If there are 15.7 grams of iron and 7.99 grams of oxygen, how much heat will be produced? Homework Equations Since Iron is the limiting reagent do I use that to determine the heat released? The Attempt at a...

Homework Statement Chromium metal, Cr(s) can be prepared from reacting chromium oxide, Cr2O3(s), with aluminum, Al(s). Al2O3(s) is a by-product. Assume a reaction of 20,0 kg of chromium oxide with 5,00 kg of aluminum metal. 1)how much Chromium metal will produced from the above reaction? 2)...

What is fear? can anyone understand that fear is not only produced by physical violence, fear is some times irrational.

Hello friends, Iam new to this site and I hope I didn't post this form in the wrong location. I would like to know how to calculate pressure produced by explosion? To make it clear, here is an example: A metal box with volume = 10cm^3. There is, let's say, gas fuel with know quantity...