Source Definition and 1000 Threads

Homework Statement https://www.edx.org/static/content-mit-6002x/images/circuits/H1P2.79e52b492b94.png Homework Equations It's been a while since I've done KCL/KVL, could be that I'm being just being stupid. I'm trying to find v1, i4, and the power in all the circuit elements...

1. Making appropriate use of resistor combination techniques, calculate i3 in the circuit of Fig. 3.84 and the power provided to the circuit by the single current source. 2. Connected in Parallel and Series. Ohm's Law. KCL/KVL 3. I honestly am just guessing how to do this one...

Hi folks...I'm new here, please go easy on me, it's been quite a long time since college physics! :-) I need a feasible and readily available heat source for a Stirling cycle engine. (It's a type of engine that runs off of hot air...google it and you'll see plenty of examples.) Is there a...

Homework Statement http://imgur.com/jsIWS Homework Equations Ʃ V_{n} = 0 Ʃ I_{n} = 0 v = ir The Attempt at a Solution I combined the two 2Ω resistors into a single 4 Ω resistor because they're in series. Then I tried to use KCL but I got 2 unknowns in one equation. 0.2A + \frac{Vi}{4} = I

Homework Statement Calculate Vout if a) I=1mA, R1=2.2kΩ, and R2=1kΩ; b) I=2A, R1=1.1Ω, and R2=8.5Ω. c) For each case, state whether the circuit is wired as a non-inverting or an inverting amplifier. NOTE: I is set to 1mA in the circuit below. Homework Equations Req=(R1*R2)/(R1+R2) V=IR...

Hi folks, the subject line says it. I'm currently using geogebra as a note book in which to write "memory cards" in latex. You know the sort of thing: when you learn a new formula and want to keep it in virtual "card" form. I love Sticky Notes, but I can't get latex on to them. does anyone...

1. Homework Statement Two different single slits are used in an experiment involving one source of monochromatic light. With slit 1 in place, the first dark fringe is observed at an angle of 45 degrees. With slit 2, the first dark fringe is observed at an angle of 55 degrees. a)Which slit is...

Hello semiconductor technologists! I'm thinking at a source of extreme UV for semiconductor lithography, so what would be your wishes, as compared to the first figures that emerge from my rantings? I take 30nm wavelength. Would less be better? I fear fluorescence hampers lithography...

For a neuroscience book I am writing, I am looking for the person who first said/wrote the following quote: "We discover things about the universe we can no longer even imagine." THIS MAY NOT BE THE EXACT QUOTE, BUT ONLY HOW I RECALL IT FROM ABOUT TEN YEARS AGO. I think it was from a Russian...

Hi! I'm having some difficulty understanding how to go about solving the following problem. I'm a beginner at this and am completely lost. I've seen a few similar problems that could be solved with node/current analysis, but I don't really understand if or how to apply that here. Can someone...

Suppose you have a Markov source of symbols (or more generally, a stationary ergodic source). If you Huffman encode longer and longer extensions (that is, you take blocks of n source symbols at a time, letting n increase) of this source, then the frequencies of 1's and 0's in the encoded...

an independent source with a forcing function modeled by cos(500t) is in series with an 100 ohm resistor. A dependent (current controlled) source is placed across the remaining resistor terminal and ground. A 0.3mH inductor is in parallel with the dependent source. The value of the dependent...

Homework Statement I don't really know where to post this but I chose this section. I need help finding the source of this Feynman Quote "The probability of detecting a photon at any point is the sum of all the probabilities of the photon being detected at that point by any path" Homework...

I need to find a switch that can detect whether it should go from 9v source or 5v Source. I am making a tool that has a battery power of 9v and it can also get powered from a USB device, which is 5V. If the customer need to connect the tool to a computer while its running from the battery...

I'm doing an adult-education course this semester which aims to take the student from pre-calc to calc in 18 weeks. The materials on offer at the course (for which I only have 3 contact hours a week) seem pretty slight to me. Does anyone know of a good online source of exercises and worksheets...

Hi, I'm working through a power electronics book and I'm looking at a half-bridge transformer-isolated buck converter (attached page). I've run into something that I can't fully understand even though the author presents it as something obvious. At 0 < t < D*Ts, the Q1 FET is conducting, and...

I know that the Casimir effect is a purely quantum mechanical phenomenon arising from the suppression of photons in the space between the plates and thus pushed together from the photons outside the plates. But just looking at a single cycle of the plates of the plates coming together, where...

Hi How can I see the source codes used for defining intrinsic functions in Fortran 90/95 ? e.g. what is the actual program for sqrt ? thanks

I am trying to teach myself optics out of the text by Sears, with some looks at Optics and Vision and a few other texts. I'm trying all the problems in Sears, and the answers to the odd problems are in the back. Unfortunately, I am getting a good fraction of the problems wrong. Sometimes it...

Homework Statement Find: a) the equivalent resistor seen by the source; b) value of i0; c) value of v; d) value of v0. http://img823.imageshack.us/img823/4406/dasso.jpg Homework Equations Kirchoff's laws and Ohm's laws The Attempt at a Solution To solve b,c,d I need...

This appears to spin forever. Isn't it possible to build it big enough to generate a reasonable amount of power? [Link to Perpetual Motion Machine Deleted]

I'm asked to get the noise signal from the constant current source I built with a 741 Op-Amp. I know I have to read it from the scope, but how do I go about the connections to the scope, and what other procedures must I follow to read the noise contribution? Pls refer to the figure provided in...

Hi all ! This is a weird problem. A simple program to read a file and display it works differently when compiled with different versions of the same compiler. When I compile it as: garbageij@garbageij:~/NMA$ mpif90 exp4.f90 and run it, it gives the correct output. But when I compile it as...

I tried to googling about this, but not find the answer; and even I'm not sure whether this is possible. Here the condition: I have a Windows laptop and a Linux workstation (workstation + monitor). The monitor is connected to: (1) DVI-D: connected to Linux workstation (default) (2) Display...

I'm an A level student, and one that doesn't usually write much in school other than the odd word between squiggles and numbers. (I'm studying maths, further maths, physics and electronics.) But now I find myself in the position of writing two different essays, which should be good, as it's...

I am a mechanical engineer and I'm working on a project in which I need to generate a large magnetic field in a coil of wire. The current system uses AC power (480V or 230V) and I am exploring the possibility of using a DC battery source. The coil is has an OD of 72mm, an ID of 62mm and a...

Is it possible to power the op amp in this diagram in this manner if it requires +18V and -18V? This doesn't seem valid to me, but I'm not sure why it's not exactly. Thanks

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...

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...

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...