Device Definition and 531 Threads

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?

I am sure it is not right, it seems able to go backwards far more than the other, and has less control, it has little pain until it goes backwards, the only outward sign of malfunction is that it is quite hot ? is this a doctor thing or wait and see thing?

Hello everyone. I was just wondering is anyone knew an example of a physical device with a)both inductance and resistance b)capacitance, resistance, and inductance. I looked these up on wikipedia and I got that an example for b) would be a radio tuner, is that right? Plus, I can't get a)...Any help?

I am in high school, taking a college Physics for Scientists and Engineers class. I am stuck on one problem concerning an atwood device. I have an atwood device with two masses (m1<m2, m2 higher than m1, connected via a massless string) and a pulley with a mass Mp and radius Rp. The pulley...

A Venturi device has a diameter of 4mm at one end and a diameter of 2cm at the other. Air enters at 1200cm^3/m. Mercury is in the botom of the device. Assuming mercury's density to be 13700kg/m^3, and air's density to be 1.2kg/m^3, find how high the mercury rises. Assume air to be an ideal...

From wikipedia: A filament lamp obeys ohms law within certain limits of voltage and current so does that mean it is an ohmic device? Also from wikipedia: Sounds reasonable as well. Im inclined to believe the second quote since there are only a few values that the filament lamp will...

A process requires a steady supply of saturated vapor steam at 200kPa and 0.5kg/s. Also required is a steady supply of compresed air at 500kPa and 0.1kg/s. Both are to be supplied to supplied by the process shown. Steam is expanded in the turbine to supply the power needed to drive the air...

I wasn't sure where to post my question but it seems like it would belong here. I was hoping for an anti-physics category or something hehe. I apologize in advance if I was wrong. Anyway, I've been reading about perpetual motion machines and I understand the physics behind them and why they are...

I have a limited understanding of how nuclear devices work and understand the basic physics related to fusion and fission. However whilst I do not believe the latest assertions by Bashir the cleric from Indonesia who reckons the CIA set off a micro nuclear device in Bali - rather than it...

I work for the Coast Guard reserves as an ET. My primary duties include performing the monthly Preventative Maintenance onboard the ships at the nearby station. Of the monthly checks I must do, one is perform the SINAD for the radios. We have a SinAdder 3 which works fine in the shop. However...

Currently I am using a pc to drive a stepper motor through a xylotex-brand motor controller. The problem is the PC's time clock just doesn't allow for steady movement. What I need is a specific controller to handle the signal to the motor. All I want the PC to do is send a command to the...

I always think of little things I want to build or do. I originally studied EE when i first got into college, but switched to IS. I have a base understanding and can solder. I'm basically looking to build a device that hooks inline with a sensor on my motorcycle. The plug has 3 wires (power...

I was wondering if anyone could point me towards a source about making constant head devices. I was wanting to measure and then relate, experimentally, the velocity of a stream to its cross-sectional area. Since this will be done mostly at home using pedestrian tools, I need to find out how I...

Hi everyone, Im designing a new device for openeing bottle caps. But I am stuck, :cry: basically I have a second class lever (pivot at one end, effort at the other and weight in the middle). The weight is 72.21N the overall length from the effort to the fulcrum is 64mm and the length from the...

would this work? first of all, i need to know if my reasons for glass being transparent are correct. glass is a crystal, therefore, when the outermost atoms are hit by lthe first photons, the energy, by way of phonons is transferred to the inner atoms as well. when the second photons come...

Hello everyone, Anyone know a good book for programming a windows mobile device?? I'd appreciate it.

I am to use a pyranometer, a device that measures sunlight intensity. I am confused about the output unit it produces. It says on it's side 4.55 \cdot V/\left( {W \cdot m^{ - 2} } \right) but I'm not sure how to interpret this unit. All help will be appreciated...

allright so I'm constructing a rube goldberg device as a side physics independent project and it has to go through ten steps to achieve the final outcome of lighting a bulb. i need some ideas for steps I'm drawin a blank. it has to go through 5 different energy changes like potential, kinetic...

Hey guys, what is the name of the device that display sound waves as transverse waves on a screen? Thanks

is it true that electoronical device are still alive even when they are off? if yes why?

Question An automatic external defibrillator (AED) delivers 125J of energy at a voltage of 1050V. What is the capacitance of this device? Possible Ans Capacitance is charge / voltage. We have the voltage so how can you get a value for charge?

I'm looking forward to doing some photography projects indoors, but I'm having a hard time differing between sources of light around me. I suspect that the lighting system in my basement is not as bright as I suspect it to be. Thus, I came to the conclusion that the upstairs room was a lot...

I have Main board Intel D865GVHZ HDD40GBWestern digital RAM256MB Processor intel 1.7ghz running WINXPsp2. When swiching on the system after POST before loading windows I got error massage " Reeboot and select proper boot device or insert boot media in selected boot device " When I restart...

First of all I would like to apologize if I am posting in the wrong forum. I couldn't really decide if this belonged in the general physics, homework, or engineering forums since it involves principles of physics, is technically an assignment, and also has to do with engineering. Anyways...

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Hey, I need to design an egg crash landing device in order to protect an egg that is being dropped from various heights. The catch is I am only allowed to use 1 metre of masking tape and 10 sheets of computer paper. If anybody has done this experiment before or have any suggestions, I...

Well i have been assigned a project in my physics class that is totally clueless to me so i have come to all you smart peoples to help me with it because I am like totally clueless of what to do... I am to create a rolling device powered by (a) rubber band(s) (no engines, etc)...

http://www.mlahanas.de/Greeks/Kythera.htm ts complexity is far in advance of that what was expected from a device that was build about 80 BC. The part found contains 32 gears. Its use of a Differential Gear to subtract the sidereal motion of the sun from that of the moon to produce the synodic...

Could those chips which they can put in the brains of quadripletics (sorry, spelling mistake probably) which allow them to move objects by having an electronic device read their thoughts be used in other people (At a cost) for example those who wish to improve their relationships with others or...

The control program for a device-driver process is an infinite loop. Roughly, the loop body is: wait for I/O request from user process; send I/O command to device; wait for command completion; notify (unblock) user process. a) [10 marks] Suppose the device driver waits by polling the...

Hi I need you help I must connect this function Z= X3'X2'X1 X0+X3'X2 X1'X0+X3'X2 X1 X0 in a Multiplexer the 74LS151 without using any other TTL device. I was thinking of putting in the 3 bit entry X3 , X2 , X1 so how do i put X0 and where ? How do I connect I's to form that function, I...