Generation Definition and 363 Threads

Hi My son (and now me too) want to know how friction develops heat. The only explanation I can think of (and that makes sense to me) is that during the rubbing molecular bonds are broken completely, or then remade at lower force levels, then the surplus energy is then transferred into heat...

Hello, I am in process of building a set up where i will be using a pendulum to impact a cylinder to generate angular acceleration. I started from basic physics for a answer and found the following method but doesn't seem to go any where from here. Please provide guidance. Torque = Moment...

Decay rate help I've been debating decay rates with another poster in another forum. Basically, the other poster has stated "The half-life/decay rate of the substances used in nuclear power generation have nothing to do with the generation of power. That they ARE radioactive is. Spent fuel...

I've reposted this in the nuclear engineering forum, which seems more appropriate. I'd just delete it, but can't see the way to do so. I've been debating decay rates with another poster in another forum. Basically, the other poster has stated "The half-life/decay rate of the substances...

I need help finding a device that can generate a sustained arc while utilizing only a 12 volt power source. Does anyone have any ideas? Arc should be able to jump a 1 and a half inch gap. Also what materials should I use for the electrodes that would not degrade over time?

Can anyone tell me what the most standard way of changing the frequency of an AC power supply is? Can it be done with circuitry or does the method of generation need to be set at the desired frequency?

hi friends, i came across this piece of news... "Until 2010, no solar sails had been successfully used in space as primary propulsion systems. On 21 May 2010, the Japan Aerospace Exploration Agency (JAXA) launched the “IKAROS” (Interplanetary Kite-craft Accelerated by Radiation Of the Sun)...

I would like to know of anything concepts regarding EMP. It's generation & how to sustain the pulse over long periods of time to create something like "no fly zones". Either to create a temporary block or permanent damage to any electrical items caught within the pulse radius. Also please...

for a three phase power generator, you can have sources in series with inductances in either a wye or delta formation by designing the generator differently. from my understanding, if you choose wye instead of delta, then the power produced will be increaced by a factor of the root of 3 in...

Hi this is my first post on here I am looking to create a large voltage across a primarily capacitive load at around 190 kHz. At the moment i have a 175 Watt power amplifier which puts out 55 Vp. The output impedance also needs to be quite low < 100 ohms Does anyone have any idea how to...

In fuel cells hydrogen combines with oxygen (due to a catalyst) resulting in a potential difference. Is it not possible to burn the hydrogen and use the energy from this exothermic reaction to produce electricity? Since the rate of reaction of hydrogen combustion is quite high we could keep the...

Hi Everybody! I have been wondering about wave generation from point sources, and interference. I have noticed that if several point sources are sited in a line much more than one wavelength long, a very directional interference pattern develops. The closer the sources and the longer the line...

Hello there, I'm new in this forum so sorry if this is not the right session to post my question. Well I'm taking a subject called Energy: Origins, Conversion and Uses (I guess this is the correct translation) and I need to do a final project which requires me to generate electrical...

I know people get tired of answering questions about photons, but I have a question regarding the best way to think of how light (i.e. E-M waves) are created. Several books and educational resources say that a light wave is created by "vibrating electrical charges." But my understanding of...

Hi All, I am currently designing a tethered balloon. The balloon is 36m3 and I was hoping to fill with hydrogen. The balloon will only be fully inflated at 400ft as I am aware of the risk of a hydrogen explosion. Unfortunately I live in Australia and 36m3 of hydrogen is USD$1800! I am...

Hi guys. I have a small question and i would appreciate your help. I want to find how many neutrons per second (in 4π) are produced from a neutron generator. The generator works with T(d,n) reaction.. We have 0.5 mA d at 100keV energy that hits a target of titanium-tritium that has 2*10^20...

Had a bad day at work and my design for a spark generator failed, so I'm asking for help. My requirements: To create a spark in a hard vacuum environment (10^-6 mbarr) To be ultra miniature (as a guideline about 1cm^3 is the space available) Available power lines is 4.4v at 0.22A or 700V...

Homework Statement Let (X,\tau) be X = \mathbb{R} equipped with the topology generated by \EuScript{E} := \{[a,\infty) | a \in \mathbb{R} \}. Show that \tau = \{ \varnothing, \mathbb{R} \} \cup \{ [a,\infty), (a, \infty) | a \in \mathbb{R} \} Homework Equations A topology...

I want to estimate the efficiency of SFG in a BBO crystal for the situation when one pulse has much higher energy than the other (nJ compared to fJ), and the beams cross at an angle in the crystal. Can anyone recommend a resource that would help with this?

Does anyone have a clue on how to obtain the mesh from the ultrasound image? The region of scatterer is automatically more densely meshed than its ambient. Any software? algorithm? Thx. Elgen

Hello. I'm interested intaking a cloud formed of activated carbon particles and particulates of some other substance to produce static electricity similar to that formed in a cumulonimbus cloud. The means of containing this experiment is another matter. I understand that when "opposite...

hi, I am just not able to solve this problem in the generation part of electrical power system. I am not able to plot the load curve and the load duration curve.sum is as follows:- A power station has to meet the foll demand:- GROUP A: 200 kw between 8 am and 6 pm. GROUP B: 100 kw between...

Hey, I am wondering how to solve this heat equation with a 'generation' term included. In one instance I am adding the generation term, in the other I am subtracting it. a\frac{\partial^{2}f }{\partial x^{2}}-\frac{\partial f}{\partial t} - \lambda f = 0 a\frac{\partial^{2}f...

i would be delightful if someone Can suggest me any book for this topic-'Electrical power generation and distribution in an aircraft. i am doing my thesis work on it. i would like to add few more points with your help. Thank you

Besides expanding and collapsing a magnetic field through a conductor, does anyone know of a method of producing electric current when the conductor and magnetic field are stationary relative to one another? I am familiar with the Homopolar generator (faraday disc generator) as well as all the...

Hello all, This is my first post here, and I've got something that is stumping me. no this is not for homework, My question is this, When electricity is generated, where do the electrons come from? I mean if they we're coming from the copper wires, or magnets inside the dynamo wouldn't we see...

Well it is interesting, a lot of it seems science fiction at the moment, but who knows what the future holds!

Hi guys I'm reading a section in a book about non-linear optics. They have an expression for the polarization for the second harmonic field. They say that this expression has a linear and a non-linear contribution at frequency 2ω, but they don't explain this any further. I am a little...

Hello reader, I was heating some coffee in the microwave oven today when I had an idea come to me. Is it Possible to heat water with microwaves, (dielectric heating) to superheat water? Then allow it to form to steam, turn that steam into dry steam. And then use that to turn a generator...

I know that this has been proposed as a possibility for large scale power generation for many years, but according to this new article it seems that at least one power company is very serious about getting this up and running in the very near future. Any thoughts on this? Do you think it will...

I've been trying to wrap my head around this one for a while. What are the drawbacks to using a brayton cycle solar generation setup? Here's the setup. It seems a car turbo is the cheapest and best suited so that's what I'll prototype if the idea gets that far. Atmosphere => Compressor =>...

Homework Statement How accurate is the estimate for (cohort) generation time (the type you'd have on a life table)? Homework Equations Cohort generation time: Tc = Sum of (x*Fx)/sum of Fx The Attempt at a Solution Tc = 2.77 (for 7 generations) So the generation starts of with...

Homework Statement What is the name of the following very small unit? {f}'(x) h The Attempt at a Solution I know the name in Finnish "Differentiaalikehitelma", but not in English. However, I have not managed to find help about the method which my professor says is very important...

Homework Statement A windmill is designed to operate at 20 rpm in a 15 mph wind and produce 300 kW of power. The blades are 1.75 ft in diameter. A model 1.75 ft in diameter is to be tested at 90 mph wind velocity. What rotor speed should be used, and what power should be expected...

Hello All I am new to this great forum. I would like some thoughts on my idea which is: I am designing a passive solar greenhouse for aquaponics. I am concerned about excess heat in the summer (I am in western NY Sate). A requirement is air exchange for a healthy interior environment. I am...

Are there any good resources for learning how Electric Power Generation works? For example, let's say you have a deisel generator pumping 60 Hz into the Grid. I'm wondering how the physics of this works, or if there is a reference area on the internet I can learn more about this. Or if...

In the double slit experiment sometimes it is claimed that one electron at a time could be fired. Can we deterministically generate one electron when we want ? is it like a gun where you pull the trigger and exactly one electron will be detected or is it that we energize some source and "wait...

welcome every body i have question about the photons generation? i know that there are two ways to generate what so called photon 1-- the first is by atomic transition and i study this way alot 2-- the second by electrons oscillation due to ac current like in antnna My question is why...

Let's assume the case for metallic ring that possesses a net negative charge within. To generate a magnetic field, the field generated by negative charges should not be canceled out by the positive charge. There are two ways to do this: 1) Move only the electrons. 2) Move the electrons with the...

Hey, I was wondering if someone could post or create/explain a simple piezoeletric problem in which a stress acts on a piezo material and creates a voltage. I want to be able to understand how to caculate the voltage generated and current created. Thanks for any help

After walking along the Thames every day on the way to work, I noticed that the water lever difference is between low and high tide is about 7-8m. Thoughts soon turned to how to harness this for power generation. The idea I had is to have a large weight buoyed so that it would rise with the...

GHz ac frequency- Maximum "Practical" generation - Solenoid question for the experts. It's me again. Big ideas, big questions. (A quick special thanks to everyone who has ever taken a moment to answer my questions: (Bob S, bipolar, Phrak, f95toli, jambaugh, waht, Pumblechook, ZapperZ...

Hi, I am a novice. I have very sensitive high end audio equipment. I want to power them up from an independent source. I was contemplating using a electric motor driven generator. I want to do this to supply cleanest power to the equipment/electronics. My power requirement is about 5 KVA. I am...

Dear All I need to generate data for my research. Let I have a linear equation with 3 independent variables and 1 dependent variable a0x0 + a1x1 + a3x3 = y I want each of my variable(x0, x1, x2) has a defined R2 (r square) with y. Let x0-y = 0.8, x1-y = 0.9, x2-y = 0.85. Any reference how to...

This is my first post on these, so let me introduce myself. I'm 30 year olds and I work in the HVAC-R industry. I live in Norway, so bear with me on my English, which might be somewhat "off" some places. As we all know, power consumption in all electric appliances equals heat. I know that some...

is the only way to generate a photon by knocking an electron into a higher energy level and when it jumps back to its original energy level it releases the photon because of its excess energy. and wouldn't that mean that an electrical current is always needed so that the electron can initially...

For those familar with Irans current nuclear power plant that is under construction, the Iranians claim is for peaceful electrical generation but Israelis claim it is used to enrich Uranium for the purpose of WMD. Any comments on Iranian under construction nuclear plant?

I've been reading a few articles lately, such as http://www.boston.com/lifestyle/gallery/dumbestgeneration/" , about how my generation is the dumbest. When I first heard about this, I thought it was a bunch of crap. I thought to myself, I'm pretty smart, write? But then taking a moment to...

Homework Statement (a) Compute the specific energy generation rate of the Sun as a whole. (b) Assume a human of weight 100 kg has a “luminosity” of 100 W. Compute the specific energy generation rate of a this human. Homework Equations Need help with the equations part. The...

This question concerns a problem in Arfken and Weber (from the infinite series chapter, after the power series section). I went to the homework section, and the titles beneath each section specifically imply that a question from a graduate book is inappropriate for that section. I thus post it...