Device Definition and 531 Threads

Let's say there is a water based heating device that has 3/4" connection nipples. The pipe that leads to the device is 5/4". If one ignores pressure- and head loss, does it make any difference how far from the device the pipe reduces from 5/4" to 3/4" ?

ok the device used is called a “Instron” electromechanical testing machine. not sure if anyone is familiar with this, but that isn't the real point. ok, so an aluminum beam, dimensions: "ext. gauge length: 4in" "Spec. gauge length: 2in" "thickness: 0.037in" "width: 0.5in" now, the...

If one day we were to engineer a deep-brain stimulation device that would bring you happiness whenever you wanted it, how would the government try to regulate it, if at all? Do you think it will be priced at a pay-per-use rate (each time you activate it, it will cost you lots of $) or...

Capacitor AS an energy storing device help!? Homework Statement An air-filled parallel-plate capacitor has plate area A and plate separation d. The capacitor is connected to a battery that creates a constant voltage V. Question:find the energy U0 stored in the capacitor. Express your...

For a lab yesterday we recorded points to plot the I-V graphs for a few resistors and a light bulb. The light bulb was supposed to show that some that some devices don't obey ohms law but when plotting the graph I am cutting more of a straight line then a curve showing that it DOES! Could this...

Homework Statement A gas contained in a vertical frictionless piston-cylinder device. The piston has a mass of 4kg and a cross-sectional area of 35 cm^2. A compressed spring above the piston exerts a force of 60N on the piston. If the atmospheric pressure is 95kPa, determine the pressure...

Homework Statement I have a question on semiconductor device,, A drift current density of Jdrf=150 A/cm2 is required in a semiconductor device using n-type silicon with an applied electric field of E=25V/cm. Determine the imjpurit doping concentration that will achieve this specification...

Hi, can anyone help with advice on what basic device can i use to calulate power usage? the implementation I am looking at is follows mains socket -- device -- appliance its much like the product -> http://www.p3international.com/products/special/P4400/P4400-CE.html except i want to do...

When you have a current inrush from turning on a devise, does that mean there is actually less resistance for that brief amount of time?

Hi friends, I need your help about a subject in my mind for a few months. This will be a project for a course. I want to make a device which controls the lights in the room. I do not know if anybody made this before or not. Also this thing will be useful for homes. You do not need to turn on...

I have an ecofan that sits on top of my woodstove. It is powered by the thermo reaction between 2 metals, thus exciting electrons which then power the fan. Great device for moving air around the cabin. Living off the grid in rural Alaska, I'm in search of a larger device that could produce 12...

effect on Flow and pressure measuring due to turbulent flow of air Hi, I want to measure the air flow rate using a device which will basically measure the velocity of air and converts that in terms of flow rate reading. For creating flow of air i have used vacuum pumps which is connected by...

Hi guys, Background: There are 2 relays, A and B that needs to be controlled (24V) And a signal generating device that composes of a push button and an adjustable mechanism for timing delay between the 2 signals. (this is what I want to design) Specification: I want to design a...

Homework Statement Suppose a cooking device has a power of P Watts. The temperature of the bulb which radiates heat is determined to be T (in Kelvin). Write an expression for efficiency in terms of T and P. Homework Equations E = \sigmaT^{4} Stefann Boltzmann equation \eta=...

Homework Statement see attachment Homework Equations The Attempt at a Solution I do not understand the diagram.

About a decade or so ago, I came across a website that featured a reactionless drive some guy built in his garage. My google-fu is weak, and I can't seem to find any info on it on the net anymore, and was hoping someone knew something about it. It worked as follows: There are two rings, set...

I think I am missing something in Schrodinger's Cat... Wouldn't the Geiger Counter cause the wave function of the decay to collapse because the Geiger Counter is interfering with the wave function? Would the Geiger Counter end the superposition of the particle? Does the problem lie with what the...

What is the device used to measure percent light absorption in pigments? I remember finding the percent light absorption in the pigments of some vegetables for a high school bio lab. I am pretty sure the device used was not specific for pigments. The device was user friendly- we just stuck...

Homework Statement Choose an instrument to measure the output from the crystal, when measuring variations in stress. The maximum voltage from the crystal is 200mV. current in circuit is 2 x 10-8 A, p.d is 4 x 10-15 full scale deflection, sensitivty...

My idea is to create a flotation device that would have a strong electromagnet at the top, this pulling objects upwards, just enough to cancel out gravity. A computer software will determine how much power to send to the electromagnet by knowing exactly how close the object is to the...

Homework Statement An inclined tube reservoir manometer is constructed as shown in the figure. Analyze the manometer to obtain a general expression for the liquid deflection L in the inclined tube in terms of the applied pressure difference \Delta p. Also obtain a general expression for the...

Can anybody provide an example of a device capable of "directly" measuring position relative to some origin on a microscopic scale? By microscopic I mean on the scale that QM is important.

I am looking for a table or resource of any kind that can break down properties for me for different devices such as Steam Turbines, Pumps, Nozzles, Diffusers, Throttle, Condenser, Heat Exchanger, etc. Basically like for a pump it would be 1inlet 1exit Mi=Me(constant mass flow)...

Allow me to be so bold as to ask,how do you build an Electronic Inclinometer to measure a boat tilting until it reaches a 5 degree angle. When the boat tilts to a 5 degree angle, the inclinometer has to be able to read the 5 degree. The Inclinometer has to be waterproof because it will be...

Hi, I wonder if there is a Density Functional Theory or Hartree-Fock Theory based atomistic simulator that can be used to simulate nanoelectronic devices for example nano-scale field effect transistors? I looked at the documentations of SIESTA and other DFT software listed at...

Lets say I want to controle something like a robot but I want to controle it through the computer via a usb or printer plug. If the computer is plugged into the microcontroller do I still have to put the microcontroller In a PIC Programmer or can I program it wile its hooked up via the usb or...

The ever elusive "free energy" device... Hello. Let me begin by stating that I have no formal physics/science training, and am not here to wear a tin foil hat, close my eyes and claim that I've solved the worlds problems. That being said... I have a theory, and I'd like to be told why it...

Homework Statement Horizontal frictionless cylinder piston device- piston is forced againtst a spring which exerts a force directly propotional to the gas volume. Patm (101.13KPa) also acts on the outer face. Considering the gas as a system, calculate the work for the process from an initial...

how to determine static characteristic of rotational measurement device

Hello! I am a 1st time poster here who needs some fresh ideas. After lurking around several forum, I think this is the place to get them. Objective: Propel a cart carrying a 1400 pound part using energy collected from action of loading the part onto the cart. Current idea: I am...

Hello all, I'm trying to set up a system to calculate how far I've run (more accurately than a pedometer, which just counts steps). I basically need a sensor in each shoe, and one of the sensors sends a signal that tells how far apart the two sensors are. Whenever the distance decreases, I...

I'm working on a project with several others to create a flying device much like a blimp, but smaller and more agile. Our method of life is eighther a light gas like helium or preferablly, a Vacuum system that ajusts the % of vacuum inside a set space to provide lift and control decent. The...

Why does electric field in MOS device tend to increase as device dimension shrink describe the cross-section of a MOSFET with short channel showing the charge sharing phenomenon can anyone help me to find out these two problems? I could not find them out from the book thanks a lot!

Is there any specific device to convert mechanical energy to heat energy?

Hi everyone! I wanted to share my final year electronics project on PIC-Microcontroller. It is a simple light tracking device. The project theme to demonstrate the working of a Sun tracker using a PIC micro controller. The sun tracker solar panel has a controller interface that can adjust...

I have a device that is currently running on 6 1.5V D batteries which I have to replace every 2 months as they drain very quickly. In theory would it be possible to take (say) a phone charger that puts out 9v and connect and make a circuit drawing from current from a wall socket? Obviously...

Homework Statement Objective: To produce a balsa wood device that will hold and protect an egg from breaking when released from various heights. RULES 1. The device must be constructed using ONLY balsa wood (1/8 x 1/8 in) 2. Individual pieces of balsa wood may be laminated together in any...

Homework Statement The figure below shows a simple device for measuring your reaction time. It consists of a cardboard strip marked with a scale and two large dots. A friend holds the strip vertically, with thumb and forefinger at the dot on the right in the figure below. You then position...

i need to make a device but don't know how it is 2 lightbulbs, when they are far away, (more than 2 feet), then one or both of them should light up. if they are close, they should both turn off. any idea how i can do this?

For my final term project I am to build a spring-loaded camming device, like those used in rock climbing, that could be fitted inside a horizontal crack and hold as much weight as possible. The device, which must weigh less than 500g and be less than 20cm long in any dimension, will be tested in...

Homework Statement I am creating a device to provide 250 to 300 g's of impact force to an electrical device in a plastic housing. I would like to lift a steel plate approximately 16" x 16" X thickness "T",, to a height of "Y" and release it. It would fall at the rate of gravity, impacting a...

Here is another informercial product we should discuss. The claim is when you plug this small device into any electrical outlet it repels rodents and insects/bugs. Apparently it sends a patented pulse technology through the electrical system of a house. While doing some google searching some...

I was wondering if it was possible to construct a certain device. There would be a speaker on one side of a wall generating a certain frequency, and on the other side a receiver that would give an image of what was in the wall, such as cabling, studs, etc. I'm sure the technology exists, but I...

If I have a device from the UK, and on its AC adapter, it says that on 'sec' (presumably referring to the secondary winding of the transformer), the output is as follows: 12 V 1500 mA 18VA My question is as follows...if I don't have an adapter for the UK style plug at this...

First of all I don't smoke, never have. My dad is a heavy smoker, and finally me and my family made him undergo some therapy to quit smoking after some acquaintance recommended some guy. So my dad went there, and viola, he is now repulsed by cigarettes, and didn't smoke for a week now. Great, we...

Hello, Beeing an Advanced Physics and Sicence afficionado, but with no real cursus in these matters, I've still been having this idea for a long while : Starting from the fact that : "seeing" is merely "capturing" photons reflected by whatever is in front of you; Covering an object...

Homework Statement An ideal gas initially at 100kPa and 300K is contained in a piston-cylinder device with an initial volume of 5 liters. The gas is then compressed slowly according to the relationship that pV^2=constant until a final temperature of 400K is reached. Sketch the process on a...

Hello :) I'm having trouble working on this homework question (please see attachment). The answers are supposed to be a) 22.61 KJ b) 36.79 KJ c) 151.8*C I solved (a) and I noticed that the answer to (c) is that saturation temperature at 500kPa, but I just cannot get (b)! In fact, I'm...

Hello All, I hope this is the right place to post this. I’ve always wondered about this. What will a Thermonuclear device do to a hurricane if detonated in it's eye? Thanks in advance.

Hello: I need help determining if I and V assignments follow the passive sign convention. Here is the image of the circuit: http://img178.imageshack.us/img178/9572/pic1xu2.gif I know that in order for it to follow PSC the current I needs to flow towards +V. I'm not sure if that is...