Source Definition and 1000 Threads

In a large hadron collider at CERN, protos follow a circular path with speeds close to the speed of light. X-rays can be produced by free protons which are accelerating. Explain why this providesa source of x-rays even though the speeds of the protons are constant. Provided answer: must...

Hello everyone. I indeed like to understand the things I am learning, and for the love of me, I cannot understand why, according to the formula, capacity of a condenser in a circuit consisted of said condenser and a power source is inversely proportional to the power source's voltage. Could you...

we know electron revolves around nucleus at nearly (1/100)th of light speed..does this mean electron as very high relativistic mass such that It can become local source of gravity..but this is not the case..why is this so.?

Hi everyone! I need your help to design an antenna which produces current. Since i m not an engineer & have no technical knowledge. So, here is the principle! Guid me how to design an antenna for radio waves or any other one which will produce a maximum attainable current from these by...

If I am using a brush cutter creating 98db at ear (manufacturers claim) and I can still hear music from 30m away what would the db be at the source of the music. I was wearing ear defenders but presume that they would work equally on both sources of noise. I am lead to believe that the...

SOLVED... I DON'T KNOW HOW TO DELETE THE POST. Homework Statement Find the power delivered by a source (Is or Vs) connected between terminals a and b, after you've found the V and R Thevenin across those terminals. Homework Equations P=IV Is=given Vth=found Zth=found The problem hints that I...

Alright, let's see what ideas everyone comes up with on this question. I'm no optics guru, so I'm hoping you have better ideas than me. Here's the situation: I have a column of hot gas wherein every gas molecule emits radiation over 4π sr. At one end of the column I have a window where emitted...

I'm working in a project of an mechanical arm that will follow a light source, like a light bulb. So i'll need a phototransitor to make it work. Which one is the best for this kind of project?

Thank for all if you understand my ideal. My problem is i don't know what's neutron which cause of fission in critical accident? seem it must be have the first neutrons, and then reaction fission occurred ? eg The critical model in some nuclear accident, what is neutron source? The...

Our Sun is at least a second generation star. This is known from the heavy metal content of the star. But if a previous star (or stars) existed in the vicinity of our Sun and used up all their hydrogen fuel, where does the hydrogen come from that makes up most of our Sun?

Homework Statement A laser with wavelength d/8 is shining light on a double slit with slit separation 0.300 . This results in an interference pattern on a screen a distance L away from the slits. We wish to shine a second laser, with a different wavelength, through the same slits. What is the...

I have some basic understanding that: Sound travels through air medium, and sound is in [pure wave form] (Please, correct [...] if wrong). Sound speed is not affected by its source. Some heavy object fired by its source. The object doesn't need medium to travel. The object is in [pure particle...

Homework Statement Find the thevenin equivalent circuit of the circuit to the left of the terminals AB. Circuit diagram is attacted below. Homework Equations The Attempt at a Solution I know that the thevenin resistance is 1kohm. I also know that the thevenin voltage is the voltage across...

Two sound sources have intensities of 1×10^-11 W/m^2 and 1×10^-7 W/m^2, respectively. Which source is more intense? 10 Log (10^-7)/(10^-12) = 50 10 Log (10^-11)/(10^-12) = 10 So 1×10^-77 W/m^2 is more intense. However the next question is by how many times more? Will someone please...

Homework Statement The issue I have is that I am asked to estimate the activity of a small source of gamma radiation; the question is written below: 'A small source of gamma radiation is placed at a distance of 160mm from a detector of area 18mm^2. The count recorded on the detector after 30...

there are some computer related gadgets out there which, courtesy of the OEM decisions, have to be used with a small battery. E.g. some of the graphics tablet related pens are that way. Perhaps in some situations (like "battery prices just went up by 1000%" situation) it might be nice to be able...

Homework Statement An AC current source, 1 ∠0° A, with angular frequency 1 rad/s is to be applied to the input terminals of the circuit. Circuit is RLC, the current source is in parallel with a 1F capacitor which is in parallel with a 1H inductor which is in series with a 1Ω resistor. I...

My text says that as we approach a point source (of e.g. sound) from a distance, the phase angle between pressure and particle velocity will gradually shift from zero (in the far field/plane waves) to 90˚ (in the near field/spherical waves). I can't find any intuitive explanation of why this...

Homework Statement http://img138.imageshack.us/img138/6717/hwprob.jpg Homework Equations General intuition, KCL, KVL The Attempt at a Solution I've worked this out multiple ways to no avail. I think the easiest way to go about this is to set the left node to ground (0 potential) and go...

A source and a receiver is at rest with each other. Source emits some couple of light pulses, and stops emitting more. 1. The pulses is not reached to the receiver yet, and source starts moving. Does the receiver experience doppler effect with the emitted pulses? 2. The pulses is not...

Homework Statement A 2 \mug sample of {}^{47}Ca is encased in a lead sphere. What is the photon intensity 5 cm from the source? Use some of the tables in your book to find the required information. Homework Equations Flux/Intensity of photons from a point source...

After having several years of calculus or Diff Eq teachers telling me not to worry about what we're doing, just use the example to solve the problem, I'm having to take numerical analysis. The problem is the professor tends to give a proof and one example. The book sucks and according to the...

Hey guys, I'm trying the analyze a circuit, I have the answers I should be getting but they're way off what I'm getting when I'm trying to work it out. I think I might be approaching it from the wrong angle, does anyone have any suggestions as to where I might start. I'm trying to find v3...

What is the source of sunlight? The answer is Solar spectrum. Can anyone explain how the crimson color is created? actually what happen when the sunlight is created? Need help from the expert.

I recently had a homework problem that asked the following. Can someone please explain to me how in the world this can be true?! It makes no sense to me that you can get an intensity that is equal to when light is passed through a vertical transmission axis and a horizontal transmission axis...

Homework Statement How do i find the equivalent voltage source of... 1) Two AC voltage sources in series with same frequency and phase = ? 2) One AC voltage source in series with a DC voltage source = ? Homework Equations Equation of a AC voltage source as a function of time V(t)=V_m *...

why we take current source as a open and voltage source as a short in superposition theorem. is this is because of its internal resistance or any other reason exist?

Hi all , is it possible to use the source transformation for dependent source ..? i guess yes because i came across a problem which asks to use source transformation to find Vx as shown : http://img571.imageshack.us/img571/2389/50111057.jpg and my solution was ...

Homework Statement Why does a transistor with a constant V_{B} (e.g. V_{B}=1V) only need V_{C} \approx 0.3V to act as a current source; If V_{C} < V_{B} doesn't that mean the transistor is not in forward active mode and thus not a mode we want to work in. Homework Equations The...

In GR normal stresses as per the three lower diagonal terms T11, T22, T33 in the SET (stress-energy tensor) (e.g. http://en.wikipedia.org/wiki/Stress%E2%80%93energy_tensor) are source terms for gravitating mass. And afaik true for any similar theories of gravity. Owing to their being resolved...

Here's my current project goal ( And what I need help with): I want to use an LED light source, shine it through a 1" x 2" slit and then use a linear array camera to detect the edges of the slit. The problem: Since LEDs are a point source of light emission, my camera has a difficult time...

I had not heard of this, so I thought others might be interested. I thought that all natural Anti matter had been lost at the beginning of the Universe, but apparently there is a 10000 light year cloud of anti matter near the center of our galaxy...

Catching up on the Universe Today I came across this article discussing the history of the wow signal. Since it fit the profile of a non-naturally generated signal, the would indicate either an equipment glitch or there really was something out there sending a signal. My question is, based on...

Hello! I'm a long time reader, but this is the first time I've not been able to find the information I've needed already... I have a small electromagnet that needs to have an AC current (it is essential that the electromagnet has a reversing polarity) but the source of power comes from a 6v...

I do not have any physics books. But I would like a source, if you know of any online, where I can get practice problems dealing with the basics. Such as, 1-D and 2-D motion dealing with equations such as (X=VoT+.5AT^2) (Also dealing with different Vectors and decomposition of Vectors dealing...

Hi all, I have a question with regards to why should we use an ac-dc, dc -dc, dc-ac converter to an ac drive? Why not connect an ac source through a transformer directly to the ac drive? Isn't it the same? What equations can prove that the use of converter is a better choice?

Hi everyone, I currently stumped in the process of approaching a dependent voltage source problem using node voltages. Attached is the circuit. What I know: the Node north of the 60V supply with also be 60V there are four nodes, two when supernodes are used What I'm confused...

I am looking for a schematic diagram of a compact, temperature compensated, stabilized, high precision (accuracy within 0.5% or less) current source. The target current should be easily set to 100/150 mA, no matter if discrete or integrated solutions must be used. This project will be...

Is it physically possible that the entire universe and everything in it, in a form of a Wave, emitted from a source? That the Big Bang wasn't the point of all creation, but only our universe getting pulsated from a source. And what we see as expansion really could be the Wave (or pulse?) being...

Circuit help Homework Statement I have a book problem that show this pic (see attachment) The problem wants me to calculate Vo and the end point of the graph and midpoint but I am not sure what Vo is. Homework Equations Vo=Va-Vb The Attempt at a Solution I think Vo is the total...

Homework Statement There is a perfectly absorbing spherical shell with radius R1 suspended in space. Inside is a smaller spherical shell with radius R2. Inside that shell is a ball of radius R3. All three objects are concentric. In the center of the ball is a point source radiation with power...

Homework Statement Develop a source-panel computer program to numerically calculate the potential flow pressure distribution on a right circular cylinder with and without circulation. 1.) Tabulate and plot your numerical results for the pressure coefficient distribution on the cylinder...

Homework Statement A tiny vibrating source sends waves uniformly in all directions. An area of 3.25 cm2 on a sphere of radius 2.50 m centered on the source receives energy at a rate of 4.20 J/s. (a) What is the intensity of the waves at 2.50 m from the source? (b) What is the intensity of...

how to find power factor of the load, the three voltmeter readings are V1=220v,V2=122v,V3=136v

Hello everyone, Can anyone suggest me a suitable GUI programming language for windows (like Microsoft VB or anything else). The software should be free of cost. It also should not restrict me to publish my product as freeware/open source. (Additionally the software should be able to handle...

Homework Statement if i have source separation between 2 light sources, d, and wavelength, λ, what is the highest order node and antinode? Homework Equations The Attempt at a Solution im not sure where to start for this question I am leaning towards division to cancel out the meters

Challenge! Use Taylor series expansions to prove first-order Differential Equation Suppose dy/dt = f(y) has an equilibrium point at y = y0 and a) f'(y0) = 0, f''(y0) = 0, and f'''(y0) > 0: Is yo a source, a sink, or a node? b) f'(y0) = 0, f''(y0) = 0, and f'''(y0) < 0: Is yo a source, a sink...

It's strange no one has noticed but after reading through the Mathjax documentation guide, all you have to do to view the source code is right click over any Mathjax image and click "Show Source". A new window will pop up with the Latex code. Jameson EDIT: Try it here $ \displaystyle...

Forgive the title, I was unsure of how to briefly describe the problem. Attached are diagrams. Homework Statement The device shown in Figure P2.5 can be modeled as a current source in parallel with a resistance. When this device is connected to a 5[mA] current source, so that...

When professors are insufficient or don't teach very well, is Khan Academy a good alternative to learning topics such as calculus/differential equations, etc. as well as the sciences (bio, chem, physics)? I can't tell if the content is good resource material because I'm not an expert on any of...