Building Definition and 891 Threads

Hello all. I'm building a Fusor at home, (or at least I am trying to...) and I had a question. I know that a static electric field cannot contain ions inside it, but I was wondering if you alternate the field between different sides of the inner grid would that make any difference? The reason i...

I'm trying to build a strobe light with an adjustable frequency. I have 1.5V, 9V batteries,1 micro farad, 10 micro farad, 160 micro farad capacitors, 500k ohm volume control, 25 ohm Rheostat, breadboard and diodes. I put the battery in series with the capacitor and volume control/Rheostat in...

Hello, first time posting. If this is in the wrong forum, please move it to the correct one. (its a cross mechanical/structural/civil/electrical engineering idea) I was thinking on the way home Power generation. In order to generate power, wave motion can be used (such as tidal/wave power...

Homework Statement a worker on the roof of a building that is under construction dropped a 0.125 kg wrench over the edge. another workman on the 8th floor saw the wrench go by and determined that its speed at that level was 33.1 m/s. the first floor of the building is 12.0m high and each...

Homework Statement You are asked to construct a capacitor having a capacitance of around 1 nF and a breakdown potential in excess of 10,000V. You're thinking of using the sides of a tall Pyrex laboratory cylindrical beaker. You can line the inside and outside of the sides of the beaker with...

Hello, I need some assistance building a device. I want to input a voltage below 5v, process it and manipulate it by a programmed amount. It won't be perfectly even so I can't do it by a set resistance, meaning the scaling will be different. Example: input 3.74v process it as 73 degrees, then...

Homework Statement So for physics class we each have to build a small car (think less than 1 foot by 1 foot) It cannot be motorized, remote controlled, pulled, pushed, etc. It's not speed that's the problem though, it's distance. It has to travel about 10 meters and it will stop by going...

[b]1.We have an assignment, we need to construct the circuit of calculator using 74147 IC . Can anybody help me on how to hold and shift the data, and also how to have a 0 display. Homework Equations The Attempt at a Solution

How many bits of information are needed to build a universe, I think J Baez ran simulations on an ordinary desk top, sorry i may be wrong, but any way how much information would be needed?

So, my friends and I build ice forts each year (well, not last year... not enough snow). Each year they get a little more ambitious as we apply our previously learned trade-skills to the next generation. I thought I would share a bit here; we just started work on the third generation over this...

hello there Physics friends. I am building a Pasta Bridge. The Bridge can be made of Any solid, round, commercial pasta (e.g. spaghetti, spaghettini or vermicelli) may be used as long as its initial diameter is not greater than 3 mm and not less than 1 mm. The Bridges must span a gorge...

Hi, I have to build a sensor circuit to measure temperatures up to 2000°C. I searched for an IR sensor for this and it seems they are very costly. Is there a way to suppress the incoming IR radiation from the source and direct it to a sensor having lower temperature sensing ranges? I...

Not using template since it doesn't really fit. I have to build a rollercoaster for school (grade 12) and it's due at the end of the month. There's no restrictions, so you can build it using whatever materials and such that you want. It's graded based on loops and hills. Every loop is 20%...

Homework Statement Your physics teacher has assigned you the task of building a water barometer. You've learned that the pressure of the atmosphere can vary by much as 5 percent from 1 standard atmosphere as the weather changes. A. What is the minimum height you must build your barometer...

I have to do a project involving force sensors. I was wondering if anyone knew if there is any good books on how to build them or a book that explains how they work so I can build my own.

So essentially I'm trying to build a rotating free floating rotating cylinder (like laying a coke can on its side and propping it up so that when it rotates it won't have contact with the ground) I hope this is clear and I need to figure out what size of motor I need to turn my cylinder by...

Is it possible to build a physical tesseract? I am thinking of building one, but I'm not sure what to do with the joints. http://www.stumbleupon.com/su/2uDwyo/www.math.harvard.edu/archive/21b_fall_03/4dcube/

Homework Statement Overall goals: Your first task will be to make a buffer solution of defined pH. Part of your grade will be based on how close your solution comes to the desired pH. Your second task will be to titrate your buffer using 0.5 M NaOH or 0.5 M HCl until the buffer “breaks”...

Please help. I need this answered by tomorrow morning. The question is: Compute the average temperature over the Earth's surface given the fact that the Earth is a sphere with radius a=p. The temperature model is given by the linear transformation T=2(deg)+85sin(φ), with a 90deg rotation...

Building a wind simulator. Control amount of electricity?? I have about 20 6" fans that i'd like to mount to something in which I can control electricity to each fan and essentially simulate wind. I looked at light DMX controllers for DJ's and that would be perfect except the electricty...

I'm looking to build a new computer for myself but it's been a while since I've done so and I find the market to be more confusing now than ever. Are requests for such advice welcome on these forums? I figure a question on forum protocol would be more welcome than a blatant violation of...

Hi, I was wondering if anyone had any ideas how to approach this model building exercise. I've got to use set theory to design a discussion group, I'm given two initial sets (Persons and Strings), from this I have to make the following sets: Members - set of members, each member is a...

average force if jumping off a building? Homework Statement A 75.0-kg stuntman jumps from a balcony and falls 25.0 m before colliding with a pile of mattresses. If the mattresses are compressed 1.00 m before he is brought to rest, what is the average force exerted by the mattresses on...

1. A person drops a ball from the top of a building; 1 second later, a second ball is thrown straight up from the bottom of the same building. The ball that is thrown upwards has just the necessary speed to just make it to the top of the building. As the balls pass each other, they have the...

Hi, I'm working on a currency converter and have some trouble trying to understand how to do the callback function. What I have is 2 menus with source and target currency. I also have an edit box to enter the amount. I have to press a convert button and the output is displayed in another text...

A crazed billionaire has a lifelong dream to build the world's tallest structure as a testament to his glory. Fearing competition, he decides that his tower must be far taller than any other in order to remain that way for as long as possible. The goal: build a 10 km tower, and do it in as...

I would like to build a work porfolio for applying for freelance jobs, but I don't really have much relevant work experience that I can draw from. I have a Physics background and I'm looking for projects that are related to engineering, programming, most of the sciences, and technical writing...

I am working on making a system of pulleys and a lever. I am planning on using a complex pulley with a few blocks. I wanted to know what how much weight is taken off with the addition of each pulley. If anyone knows some of the equations involved it would be much appreciated. I was planning...

Homework Statement Air in a 140 km/h wind strikes head-on the face of a building 60 m wide by 50 m high and is brought to rest. If air has a mass of 1.3 kg per cubic meter, determine the average force of the wind on the building. Homework Equations The book seems to suggest the impulse...

Can Microwave radiation penetrates building materials? I'm living within 120 meters from a mobile phone base station and I'm concerned with possible health effects from it .

This is for a mass spectrometer project so the photomultiplier tube will be hit by charged proteins or other macromolecules. This project is mostly DIY so I'm trying to avoid buying any expensive parts. Anyway, from what I understand, electron multipliers work by releasing secondary emission...

Hi I am an artist blacksmith student and am looking at building a gate that incorporates engineering mechanisms and am a bit stumped, so I am looking for advise I intend to build a gate from forged steel and cogs I want the gate to be linked to a counterweight that is lifted as the gate is...

I am looking to build a NEO magnet magnetizer for RC motors. Currently we are having issues with the motors losing magnet strength after they are run. The rotors to replace are $30+. In the Old days, we ran brushed ceramic magnet motors. With these, we had a magnetizer to simply zap the motors...

Hi guys... we are currently interested -in our clip of aerospace engineering in my uni.- to build a complete jet engine ... unfortunately.. we have not yet found any detailed explanation to each step in doing so .. if you have any link or uploaded book or even you remember some manuals...

Homework Statement A ball is thrown horizontally from the top of a building 70.0 m high. The ball strikes the ground 90.0 m from the base of the building (Neglecting air resistance). How fast and at what angle (relative to horizontal) does the ball strike the ground? Homework...

I was thinking if the strenght of the permanet magnet could be parallel to I , the rate at which the the magnet (or wire) rotates parallel to V & of course the wire resistance would go with R . If there is some type of way to determine the outcome of a generator before building it, starting it...

Hi I am relatively new to electrical engineering, I want to make my own parking sensors for a motorcycle, don't ask me why, I would just like to play about with the idea. Could anyone suggest what sort of sensors I would need and frequencies etc?, I am looking to have one separate transmitter...

Problem solved! Thanks again Thaakisfox! Homework Statement A ball thrown horizontally at 2.2 m/s from the roof of a building lands 36 m from the base of the building. Calculate the height of the building. Vox = 2.2 m/s Xo = 0m Vx = 0 m/s X = 36m Homework Equations y = Vosin ao - (0.5)(g)(t^2)...

Hello all. I've been wanting to build a Stirling engine at home out of parts that i could easily afford/scrounge up. Not one of those small ones that you hold in your hand, but one that could generate some real work. Enough to run a small generator maybe. The problem is that i have absolutely no...

The nodes that have been used in LQG to build spatial geometries (almost from the start) turn out to be quantum polyhedra. MTd2 spotted this paper yesterday: ==quote== http://arxiv.org/abs/1009.3402 Polyhedra in loop quantum gravity Eugenio Bianchi, Pietro Doná, Simone Speziale 32 pages, many...

Homework Statement you and your friend throw balloons filled with water of a roof of a building. You drop yours from rest, he throws his with an initial speed of 72.52 m/s^2 3.7 seconds later. They hit at the same time. How high his the building. Homework Equations V=Vi+at (V^2) -...

Homework Statement A stone is dropped from the roof of a building; 1.90 s after that, a second stone is thrown straight down with an initial speed of 29.0 m/s, and the two stones land at the same time. a. How long did it take the first stone to reach the ground? b. How high is the...

I am looking at this building and wondering how building torsion is resisted as well as what role the roof diaphragm plays in it, hence what would be the shear force and bending moment diagrams...

If someone could assist me with some information re: the following it would be very much appreciated. I am planning to build an energy system for my home to address the drastically increasing power bills we have been getting as a result of the unusually hot weather lately. Problem is I am not...

Homework Statement Build a stair climbing robot. There are no required dimensions. Homework Equations MONEY The Attempt at a Solution I need help brainstorming on some designs of a stair climbing robot that is cheap but yet effective. I have connections with law enforcement so...

I am trying to design and build a small scale desktop water tunnel so I can observe the fluid dynamics of airplane models. I was thinking of a closed loop system using a long fish tank with a circular hole at both ends. PVC pipe will be attached at both openings. how does going from a round...

Hi guys, I am new at this so sorry if i get the format wrong. Im trying to build a basic metal detector that will respond when a steel pendulum passes nearby. A simple response is all that is needed right now. I thought of this: Building a RL circuit with a copper coil air core. placing a...

hi, i am pretty new with electronics, and i can't find any simple boost converter circuts on the enternet. i would like to make the circut THE MOST SIMPLE i can, with the fewest possible parts. for a power source, i have 9v-1w. for the output power, i would like to send a thin spark from 1...

Hi Guys I m trying to make a Stirling engine power by solar heat. Somewhere I found out that the solar flux available on Earth is abt 1350watts/m2 Is this heat energy only or "heat & light " combined?? I m trying to find out if my soar engine will be better than traditional solar...

The canceled Superconducting Super Collider had 3x beam energy of 40TEV vs LHC 14TEV. While it has been cancelled, could it be re-started 20-30 years after LHC hits diminishing returns in the future? Is there any new expected physics in SSC range over and above LHC that would make it worth...