produced Definition and 286 Threads

Then what gives the energy to create this emf?

I'm reading: http://www.feynmanlectures.caltech.edu/I_13.html#Ch13-S4 1. In the link it says: ##2\pi\rho d\rho## is the area of the ring of the radius ##\rho## and width ##d\rho##, if ##d\rho \ll \rho##. Why is this true?? 2. A bit further down in the text it says: Since ##r^2 =...

Homework Statement http://postimg.org/image/tdocieaxx/ Why does the force system produce no torque about O don't mg and N produce a torque about O? Homework Equations The Attempt at a Solution

I'm trying to calculate the thrust produced by a steam rocket, but I don't have that much information to work with (or at least information I don't know what to do with). It's 2m long and has a diameter of 1m, and it's constantly filled with water at a rate of 170.344L/sec, which is...

When a charged body is brought near one end of a rod, opposite charge is produced at the opposite end of the rod. This is written in my book. Why is charge produced at only the opposite end?

Homework Statement This is the theory for a laboratory session. If we have two hollow cylinders, one with radius r1 and the other with radius r7, the center of the first one being placed at a distance d from the center of the second one, what are the surfaces having the same electric...

Homework Statement Find F, the force acting at the top of the gate. The gate is 2m high and 2m into the page. It is hinged at the bottom (red dot in the diagram) Density of fluid varies linearly. 1000 kg/m3 at the top and 1600 kg/m3 at the bottom (depth of 4m) Homework Equations...

Suppose you have an electron moving at constant velocity. This new area that it is moving into initially had 0 electric flux through it but now that the electron moves to that location the electric flux is changing which in turn cause a magnetic flux ad infinitum. So why must a charge be...

This is not really a problem, more just a fact-based question. I have been using the Google, but I have been unable to find an answer. Is there a way to induce the answer that I am missing? :confused: Question: What range of distance does a double convex lens have to be from an object to...

Homework Statement The image formed by a simple two lens microscope is (a) real and inverted. (b) real and upright. (c) virtual and upright. (d) virtual and inverted. (e) none of these. Homework Equations N/A The Attempt at a Solution I was confused on how to understand how...

What does it mean that "acid is produced from ____" by bacteria? I've identified a bacteria (specifically stephococcus thermophilis) and am using Bergey’s Manual® of Systematic Bacteriology to learn more about it. The manual states S. Thermophilis produces acid from glucose, but not from...

I have no idea if this is the right place for this topic. Recently, I have been reading about particle accelerator operation and theory. I had never realized exactly how the particles were accelerated. Turns out the particles are are bunched together in clumps by an ac wave and accelerated...

Hello All, When a spinning gyroscope with two degrees of freedom sits on the surface of the Earth, with its spin axis perpendicular to the Earth and its inner gimbal aligned east to west, it will precess. What I would like to know is, how much torque is produced about the east-west axis when...

Problem: In a neutral He atom consisting of a positively charged nucleus of charge ##2q## and two electrons each of charge ##-q##, the volume charge density for the nucleus and for the single electron cloud are respectively given by \rho_n(\vec{r})=2q\delta^3(\vec{r}) and...

Homework Statement Find the correct image produced by the concave lens. F is focal length. Homework Equations If an object is placed between F and 2F, the image will be inverted, real, larger and beyond 2F. The Attempt at a Solution I choose the answer A. Is it correct? *Please...

Homework Statement A Proton moves with a velocity of 5x10^6 m/s in the +y direction. What is the force (magnitude and direction) on the proton if a magnetic field of 2.12Ti + 2.12Tj is applied. Homework Equations - F = |q|vBsinθ - Right hand rule to find direction The Attempt at a...

Hi there, new member here (**TL,DR is available at the bottom of this post**) As you may or may not know, if you were to put in a plate of zinc at one end and a plate of copper at the other, put them in an acid solution, electricity will be produced. More of that stuff here...

Homework Statement An electric dipole is located along the y-axis as shown in (picture attached). The magnitude of its electric dipole moment is defined as p=2aq. (a) At a point P, which is far from the dipole (r>>a), show that the electric potential is V=\frac{k_{e}pcosθ}{r^{2}} (b)...

Homework Statement Oxgyen gas generated in the thermal decomposition of potassium chlorate is collected over water. At 24 C and an atmospheric pressure of 762 mm Hg ((101.6 kPa), the volume of gas collected is 0.128 L. The vapor pressure of water is 22.4 torr (2.98 kPa). What mass of oxygen is...

I have two problems actually: Problem 1 Homework Statement What mass of carbon dioxide can be produced at a temperature of 1500 *C and an atmospheric pressure of 92.5 kPa, if 15.5 L of acetylene gas is burned at STP? Homework Equations PV = nRT P1V1/T1 = P2V2/T2The Attempt at a Solution...

Salutations... I am new to this and have a project that I am working on for power generation in high wind conditions and could use some enlightenment. I am using a proprietary, lite weight turbine (impeller) design, enclosed in a duct, that has the following dimensions: 4 blade turbine...

For an experiment involving a ripple tank and a wave monitor, the frequency was changed from 10Hz to 100Hz and it was found that at precisely 66.7Hz, the wave produced appeared (to the viewer) to be standing still. At any value below 66.7 Hz the wave moved inwards, and at any value above 66.7Hz...

If the cyclotron frequency is f = (q B)/(2 pi m) this gives a very large frequency for a relatively large magnetic field and for an alpha particle say. If the acceleration of the charged particle across the "dees" is cause by an alternating electric potential (usually in the form of a square...

1. The figure shows an end view of two long, parallel wires perpendicular to the xy-plane, each carrying a current I=5.00A but in opposite directions. What is the magnitude and direction of the B-field at point P that is produced by the current in the two wires? 2. B=(μo/4pi) integral...

Lets say you have a block of iron with a mass "m" exposed to an infinitely strong magnetic field "B." If there was a strong wooden interface preventing this iron block from moving towards the magnetic field source, how can you calculate the force the iron block would exert on the wooden board?

Wikipedia says that only 3 atoms of Ununoctium ever existed? How can you detect such a tiny quantity of something? How can you distinguish an elements with an half-life of about 0.9 ms or less?

Hi all, I have been searching for days (and trying many different formulas) to try and work out the force (thrust) produced by a water pump at the end of a hose (given a perfect frictionless world) and was hoping someone could help... The following specifications are given: Fluid...

Okay so, when a motor spins in an external magnetic field there will be a change in the magnetic flux threading... When this magnetic flux threading is changed there will also be an induced current that is produced but why is this induced current in the opposite direction of the current that is...

How is uniform electric field produced? Consider two parallel plates with one +ve and the other -ve. The field depends on the charge producing the field and the distance to a point in between the place. However, in this case, the distance decreases and hence the field decreases and is not...

The example I have in mind is when a pole vaulter's pole breaks. I remember at last year's Olympics one of the commentators made a commenf about thw shock waves thag would've been traveling through the pole and the guy's hands when it broke. I did a search and it was mentioned in some...

I have diagonalized a Hamiltonian matrix many times with a varying parameter (varying magnetic field). This gives me the eigenstates and eigenvalues of the matrix for the different field values. I now need to track the diabatic states through (avoided) level crossings of the eigenvalues...

Biot-Savart Law-- magnetic field produced by single wire. Homework Statement A wire of length L, carrying current I lies along the x-axis as shown in the picture. A point P is located a distance 2L below the right end of the wire, as shown. a) Determine the direction of the contribution dB to...

Hello, I was just wondering how is it that a steady magnetic flux (stationary magnetic field) is capable of inducing a current in super conductor, as in the Meissner effect, where as a changing magnetic flux (moving field) is required in the case of a normal conductor.

Hi guys. I am new to this forum and need some help in solving some problems. My company produce thin film heater( doped tin oxide deposited on a substrate such as glass ceramic, beryllium oxide, aluminium nitride or alumina and some others). I need a formula for calculating within a few degrees...

I have a stationary electric current like this: \vec{I}=I_0\vec{e_z} and I have to calculate the electric and magnetic fields from an inertial frame that is moving with velocity \vec{v}=v\vec{e_z}. First I calculate the vector potential from a rest frame (and then I'll use Maxwell equations...

Why is there no equation for solving for the magnetic field produced by multiple charges in free space? To solve for this do you sum up all the magnetic fields produced by each of the point charges or what?

Homework Statement "One gallon of gasoline contains 3.1*10^7 calories of potential energy that are released during combustion. If 1 gal of gasoline can provide the force that moves a car through a displacement of 25 mi, what is the average force produced by the gasoline?" Homework Equations...

Iam not looking for the answer, I would just like to pointed in the right direction with the formula which would help me work this out. Its been a number of years since I have had to do this. (AN EXTREMELY MATURE STUDENT) Thank you If the fuel consumption of a car, traveling at a steady 60...

As a casual experiment I was seeing whether I could make hydrogen from sodium hydroxide, aluminium and water. Rather than buy sodium hydroxide or go through a load of cleaning products to find it, I thought it would be much more fun to produce it through electrolysis. I set it up, and the...

Colours of objects produced by light due to reflection & absorption! Hi fellow members! We know that colours of our surrounding things is due to the absorption & reflection of particular wavelength of light. But we also see same colours of objects in bulb light aur tube light. Do they also...

Homework Statement An atomic spectrum contains a line with a wavelength centered at 460 nm. Careful measurements show the line is really spread out between 459 and 461 nm. Estimate the lifetime of the excited state that produced this line. Homework Equations Change in Frequency =...

It has perfect primary and secondary balance, has a smooth power delivery, and can be very fuel efficient. So why do we see so many V6s? Except for BMW and the Cummins diesel, I can't think of another I6 produced today. Back at the dawn of the automotive industry, they were very popular. What...

Homework Statement Find the electric field produced by a 2.5uC point charge at distance of 0.75m. E = ___ V/m2. Homework Equations E = kq/r^2 3. The Attempt at a Solution E = (9x10^9 Nm^2/C^2)(25)/(0.75)^2 = 400 x 10^9 V/m What do you guys think? Thanks in advance!

I m doing ABS simulation, now I just wonder that how much break torque that brake pressure can produce,,, in my simulation I used about 1000 NM, I don't know is it too much? However, the result shown that car will stop from 180km/hr in abt 5 s,,,Is it make sense? Between, in the my code, I...

In a nuclear reactor, what kind of energy is produced when the radioactive isotopes go through fission? How much of it is in the form of electromagnetic waves? Are the waves mostly in the UV and Gamma Ray region of the electromagnetic spectrum?

Hello, I'm attempting to work out the number of ion pairs produced by a 5MeV alpha particle in UF6 (in each of the solid, liquid, and gas states). Using the technique from my old radiation physics book (Turner 3rd ed) I should simply apply the Bethe formula -\frac{dE}{dx}=\frac{4\pi...

Hi everyone! I am new to the forum but you have helped me many times in the past. I need your opinion about how much (roughly) brake torque can be produced by a regular car. I am developing a simplified vehicle model and I don't know how much torque to apply when the vehicle slows down. I...

They say that nichrome is a better heating element as it has a higher resistance. But if I take V=RI then ain't I decrease since R is high, so current is lesser. Thus, resulting in a lower power dissipated as heat? Also, they aq if I use the wrong wires like thin wires, it will cause a lot of...

Astrological "evidence" produced by looking at the tails of a normal distribution I just ran across this on a large news aggregation website, so I'm sure some people here might have seen it as well. http://www.inquisitr.com/173752/jail-time-predetermined-by-astrology-signs-says-police-study/...

Does anyone have sources on how many PhDs of each field is being produced each year? i.e. how many physics PhDs graduate each other, how many in mathematics, etc.