Building Definition and 891 Threads

Okay, I have NEVER built a PC before, and I'm running into some major problems. Any help with the following issues would be greatly appreciated! 1. There is a 4-pin header on the motherboard labeled "ATX 12V". This obviously needs to be hooked up, correct? My power supply has no such...

Homework Statement A uniform cable hanging over the edge of a tall building is 40 ft long and weighs 60 lb. How much work is required to pull 10 ft of the cable to the top? Homework Equations Density=3/2 ft/lb The Attempt at a Solution Ok, the problem is this: I can solve this...

I have to build a tower in class that supports at least three textbooks. Materials 2 pieces of regular printer paper 12 inches of masking tape Specifics Must be at least 4" tall Cannot crumple I've been working all day trying to figure it out...any help would be welcomed

Hi all, I have a plan of building myself a VHF receiver that can pick up the air band (108-136 Mhz). I want to connect it than with an antenna that I plan to set it up on my rooftop. Can anybody give me some working schemes and tips how to build such thing? Thanks in advance.

I have 2 questions: 1- how tough is building an electronic distance measurement device (a rather small one such as the one's used in land surveying total stations) which for instance can indicate distance of a particular point 1 km away? (our device should fire a laser beam towards the point...

A fellow I work with claims that the world trade center buildings and building # 7 fell faster than physics will allow. He thinks that explosive charges placed in the buildings caused the buildings to fall faster than terminal velosity? I think he is a quack. how can I show him he is a quack. or...

Hi I'm playing around with Huffman encoding and am having a major problem getting my head around how to efficiently build the tree. I Googled "huffman coding" and have a basic grasp of what needs to be done but the actual process of walking through a list of sorted values has turned into a big...

http://www.foxnews.com/story/0,2933,316734,00.html http://nostarch.com/frameset.php?startat=flego_extras Forbidden LEGO Build the Models Your Parents Warned You Against by Ulrik Pilegaard and Mike Dooley http://www.tinker.tv/downloads/forbidden_lego_gun.jpg

Hi... I've been seeing a lot of job postings looking for engineers for designing and engineering mechanical building systems such as: HVAC systems, refrigeration systems, fire protection systems, plumbing and piping systems for some new commercial building developments. I am about to complete my...

Hi, I'm supposed to constuct a small rollercoaster using any material i want... I will be using tubing/hosing. A marble is what will be running through it. Now, what i am looking for is a few things that will help me build it to spec for the class. It needs to be at least a 90 second ride. In...

Homework Statement Our class exercise in World Prehistory was to figure out the volume of the building we were in and answer the following: How many a) basketloads, b) mud bricks, c) stone blocks would it take to build structure? How many worker-hours would it take? How many...

An 0.50kg mass is droped from the top of a 20m tall building. Immediately before hitting the sidewalk a) the speed of the ball is ? b) The KE of the ball half way down will be Help??

I have recently come across a few electric motors (donated to me for my school's Technology Club), two from a wheel chair with gear reduction and another power window motor from a car. The power window motor has a worm gear on it of course, which is directly attached to the axle, but can be cut...

Homework Statement A ball is thrown straight up from the edge of the roof of a building. A second ball is dropped from the roof a time of 1.00s later. You may ignore air resistance. If the height of the building is 21.0m, what must the initial speed be of the first ball if both are to hit the...

Homework Statement Hey, I was wondering what the proper section to post this in, and if it is okay to post it: I have to do a project that goes something of this sort: Basically build a vehicle no more than an empty mass of of 50 +/- 5 grams, and drop it from a point of approximately...

If you are standing atop a 2 story building and fire a bullet vertically towards the ground and drop one from the same height will they arrive at the same time? I am not a physics person but my girlfriend is in it now and tells me that they would arrive at the same time. I don't see this to be...

My colleagues and I are building a phase adjuster for LFN (Low Frequency Noise) audio signals. Since we would like to be able to adjust a range of signals that encompasses a range of around 50-400 Hz, an op amp-driven, analog solution would not be economical, nor efficient. Since we need to be...

Advice For Building a WINDTUNNEL! OK everyone i need tips/ advice on building a windtunnel. I need Info that can help me avoid problems that i will run into while making the windtunnel that would arise from lack of experience. etc. Let me provide some info about me, for refrence. I am a high...

Hi, First of all, I highly doubt this is in the correct forum so move it if necessary. I've been at this forum for a while although I never really bothered to post anything. The other day however, I decided that I wanted to build a penny shooter, or a gun that shoots penny's into maybe...

Homework Statement Sketch a CMOS logic circuit that realizes the function Y = AB + A'B'. This is called the equivalence or coincidence function. Homework Equations The Attempt at a Solution The top is connected to Vcc... Is this correct? I'm learning this on my own and...

Hi, I'm building a STM, and this is the circuit I use : http://www.geocities.com/spm_stm/Simple_STM_Rev_C.PDF I'm right now testing the circuit I build. I build a small part (U3A), and then test it, and build another small part (U3B) and test, then connect the two and test it again...

A bit early for a culminating.. but here we are at the much overused "Build an Egg Launcher" project. The idea is to use surgical tubing (2ft) to launch an egg the farthest possible (the egg can crack, it doesn't matter). The only force allowed in this is the elastic force of the surgical tubing...

I have built a number of Marx generators ranging for 30KV to 4MV I have achieved good rise time but I was wondering if anyone else here had experience with them and could help me with decreasing the duration. I mainly need just building tips and such. My current one I am building will be in...

Hi all, as a school project we are trying to build a small scale windtunnel. I've been doing a lot of reading, the design of the tunnel is basicly done now. But now comes the real math's. So I got a few questions which i hope that can be answered by one of you guys. To deside the scale of...

Hi, A group of curious laymen have entrusted me with a curious project. I've been asked to build a small library of physics and math texts that intelligent students and adults may use to self-study the equivalent of a graduate course. This should include a mix of both introductory texts and...

A surveyor stands on flat ground at an unknown distance from a tall building. She measures the angle from the horizonal ground to the top of the building; this angle is pi/3. next she paces 40ft further away from the building. the angle from the ground to the top of the building is now measured...

Hello, I've bought a skywatcher refractor 1025AZ3 with D:102mm F:500mm but unfortunatlly i wasnt able to get into my country so i have everything except the tube, so i decided to build the tube..do u know how i can find the construction instructions to build this tube or is it possible to build...

Homework Statement There is a pulley suspended off a 6 story building. One side of the pulley is attached to a mass of 250lb and the other 130lb. What's the acceleration? Homework Equations a=[(m2-m1)/(m2+m1)]g g = 32 ft/s2 The Attempt at a Solution Well, I think I'm suppose to use...

I am planning to build a bicycle with mechanical regenerative braking. I am thinking of setting a spiral spring to wind during braking and use its tension to assist in climbing hills Would such a spring give me enough power for this? Are there any other alternatives? Is this feasible?? Any...

A ball is thrown from the top of a building upward at an angle of 66 degrees to the horizontal and with an initial speed of 8 m/s. The ball is thrown at a height of 34 m above the ground and hit s the ground 11.3347 m from the base of the building. The acceleration of gravity is 9.8 m/s^2...

I am unsure if this is the correct place to post. I apologize if it is not. This is not a homework question, but a question I have in general. I have tried searching for it on the web with no luck. I remember learning in high school that when falling from a building, the fall many times is...

In many areas of math doing something "backwards" is much harder that doing it "forwards", for example - inverting a matrix is harder than multiplying it, taking a derivative is easier that an integral... But why should this be, I mean, there's nothing fundamental in the way that we happened to...

hi im a biologist not working at present]who has an idea for a lab system.Im not sure how to find a reputable engineering firm to build a prototype..The physics end of things involves laminar air flow and current and air pressure analysis. Pls advise Thank you so much

kicking rock of a building... Homework Statement A boy kicks a rock at a velocity of 19.8 m/s horizontally off the top of a 64 meter high building. How far from the top does the rock hit the flat ground? (neglecting air resistance) Homework Equations sorry, i don't know how to type...

(URGENT) help me on jsp! someone..pls help me.. i am a newbie that want build a web,i want to make a forum,but i don`t know the coding for forum using in jsp.. so please,if there someone know the coding.. p.s. i`m sorry if my english bad.. n thanks before

hi im a mechanical engineering student, and we are building an electric using a 3 phase 40 hp AC motor, which is oil cooled. The motor must be submerged in oil that is then circulated... the motor will produce up to 8000W-10000W of heat. does anyone know if it would be possible to use the...

I am interested in building a rocket with feedback control system... so I have been interested in model rocketry lately and I was wondering how feasible it would be to design and build a model rocket for my senior project complete with a control system to ensure it flies straight up. I was...

Hi Guys.. I am try building a circuit which involves with a AD9854 DDS(Direct Digital Synthesis) chip to generate a frequency controlable sine wave for me... The problem for me is that the Master clock supply for the chip need to be around 200MHz...I don't know whether there is any crystal...

I need a motion sensor that can focus on a very small area(not hawk eye) and detect a change in LED color/brightness. In addition, I need this motion sensor to trigger a cylinoid to press something when it senses. Where the hell do I find this stuff?

Hello, I need to build a toy car, that will perform the following task: Go in a staight line for 5 meters, then follow a semi-circunference (or just turn 180 degrees, but not a about-turn) and go back another 5meters, the turning is around a cone: _____________________________________ --->...

i need to find a way to be able to study for a long long time and stay focused. I can only study for like 1-2 hours before crapping and getting fatigued. I think in college, iwll need to be able to study more than that everyday if i want to scuceed. So, how do i build study stamina? I want...

Hi, I'm trying to build a shell for Linux, programming it in c currently. I need to be able to read a command like 'copy2flash' so that it'll copy itself to another flash memory, but right now I need the case instruction to be able to recognize the command and print something like "copying to...

So I'm trying to get my fm circuit to work. I've taken the design from the website below. http://cappels.org/dproj/FMdist/fmdis.htmhttp://img217.imageshack.us/img217/6839/fmdis3un4.jpg My current issue is that the circuit works, but only when hooked to a DC transformer. I get a signal of ~...

Hi i need help making my rube goldberg machine. It needs to use an Analogue Multimeter to determine how much water is in a 5 quart pail of ice cream (any amount of water) The things it needs to have in it is: 1. Needs to start by hitting record button on Digital Camera 2. 1 thing to fly 30...

Can anyone point me into a right direction on building one of these lab tools?:smile: Pleeeeeeeeze

Suppose we have a vector (contravariant) and we want to build an invariant. a) we may take the direct product of the vector with some covariant vector (1-form obtained through metric tensor) and contract. The result is scalar. b) we may take it's product with an axial vector (built with...

Hello, I am trying to work with an equation I have for force from wind on an enclosed building. The equation is two parts, consisting of Qz which relates the the gound structure to the building qz = CONSTANT * CONSTANT * CONSTANT * CONSTANT * V^2 * CONSTANT V being the velocity You then...

Help me design my "carputer" to work in the cold (advice on building a heater) Hello. You guys seem to be a knowledgeable bunch, so I thought maybe I'll post thing. My problem is that I custom built a computer to run in my car and I really need some help. I live in Calgary, Canada where in...

hi, I'm going to try to design and build a vandergraph generator for a design and technologie project for school, but there are a few things that i need help with. do the pullys need to be made out of a specific material or can they just be plastic? what's the best metal for the dome to be? and...

building a circuit?? - easy high school project...sorta Ok so my teacher just walks in one day (w/o any syllabus or assignment sheet) and tells us to build a circuit that would cause a lightbulb to flash on and off. He specified that the cicuit can't be made by buying something that was...