Device Definition and 509 Threads

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...

Homework Statement Suppose you are developing a high-fidelity soundsystem. If you wish to deliver low-freq signals to a woofer, what device would you place in series with it? A) Resistor B) Capacitor C) Inductor Homework Equations The Attempt at a Solution According to my book...

Dear All, I would like to introduce this website; http://www.imodelit.com" . imodelit.com portal is an online library of device modeling tools for electrical engineers. It offers unique solution to satisfy the initial design steps of optical and microwave components. imodelit.com main goal...

I am currently a double major in EE and physics due to graduate in spring 2008. I want to go to graduate school to study semiconductor device physics, or perhaps molecular electronics or organic electronics. Should I be looking into EE programs or applied physics programs? I know it would...

Hello I am quite a physics noob and the following is something I wouldn't bet on but is more of physics concept practice. But if it works, great! Specific questions/problems that I would like an answer to will be denoted by a number and the blue twirling smiley(:smile:), for your convenience...

I have this project for Physics 11, we have to make some sort of optic device using our knowledge of concave/convec mirrors and lens. We have to make it and briefly describe and ****, it's due on friday and i haven't gotten anything. I was wondering if you guys know any good ideas or have a good...

hi can someone help me with this?? briefly explain the characteristics of a pt100 platinum wire temperature sensing device.

Homework Statement As picture attached .We need to find the dimensions of all the parts that are Pin(A),Jaw(B and C), NUt (D) , Handle (E) .The jaw B is fixed and C is free to move towards B.There is a force T=1779.261 N on Jaw C.Secondly there is a human force involved in turning the handle...

Hey guys, I was thinking about the possibility of charging a device, such as a battery, through wireless means. Does anyone know if there has been any research in this area? Or perhaps a method already in existence? I was thinking that perhaps you could use light to heat up a receiver...

I've read of resistors being referred to as four terminal devices, and capacitors being referred to as 3 terminal devices, can anyone explain this? or point me to a source that explains it, I can't find anything about it online.

Hi, My PC runs on Windows XP Professional SP2. Today when I turned on my PC, I found that my desktop appearance had changed, more specifically the start taskbar was the white Windows classic version, not the usual blue XP version. But I didn't take it much seriously, thinking somebody else...

Hi, I'm not really into physics would would appreiciate any advice on a device which claims to save electricity. Take a look at this link on ebay -...

Hello, I hope this is the correct area for my question. Its a bit of a weird one. Can anybody help me find out what this device is in my car. I have a 1995 Nissan Skyline GTR, and on the ceiling there is a strange "instrument" that NOBODY has seen before. I have been racking my brains trying...

Hi, i have a project I am currently working on for school and i have to design a freeway type barrier that can stop a truck and keep an egg from breaking inside the truck. Anyone got any ideas because everything I've tryed so far has been crappy. Here are the rules Each team shall construct a...

Homework Statement Give an example of an ohmic and non-ohmic device. Homework Equations N/A The Attempt at a Solution Resistors - Ohmic device Light Emitted Diode (LED) - Non-Ohmic device I just need confirmation at the moment. I am trying to answer some questions and this...

I have another question. Is there a device which currently exists which can produce in the region of 10^25 electrons per second? I have to admit, I am a bit doubtful as to the existence of such a device simply because of the sheer number of electrons which it must produce.

I'm doing background research on a real application. At high altitudes (and/or when people are shooting at you) helicopters can't stop and hover, but could snag a survivor or critically injured litter patient at around 30 knots (15 meters per second) A similar device (Fulton Recovery system)...

I want to build an electronic device that transmits ultrasounds (I guess that is in the LF frequency range [?]). Does anyone know where I can find a kit that creates ultrasounds?

Homework Statement We have to build a device that can move across a wire. There are two parallel wires, both very thin, 14.5 cm apart, seven feet above the ground, and we have to move the device the length of the classroom on the wire as fast as possible. We are allowed one motor, one 3 Volt...

Does anybody know where i can find the Digital Circuit for an ATM Device in .ewb format??

I accidently bought a memory card and realized I didn't have any device to plug it into. I have a normal PC running Windows. What device would I need to make use of this memory card?