Building Definition and 891 Threads

Good morning everyone, new member. Have been reading some other posts for awhile. I am auto technician/business owner. I was wondering if I was to post some rudimentary plans for a rv cover I am going to build over a 2 post outdoor car lift, if some one would be willing to give me points on any...

Suppose I have some arbitrary square matrix M, and I want to build a unitary matrix U: U=\left[\begin{array}{c|c}M & N \\\hline O & P\end{array}\right] Does there exist some general procedure for determining N, O, and P given M?

Afternoon everyone, I just found this awesome site where I thought I could enlist the help of a lot smarter people than myself with my project. I want to build a garage elevator to raise and lower various articles from my storage loft. My loft has 9' floor with a 15' ceiling. I was going to...

For the sake of knowledge, I'd like to ask few questions. Although not now, I'm thinking of building my own cheap tensile testing machine that isn't used for testing on ones with such heavy loads like commercial machine. 1. For the uper body, I'm just planning to start by connecting with...

Hello! I read several books and took courses on quantum mechanics and particle physics and I understood the topics. However I feel that I have only pieces of informations without a global image of what is going on. For example in the particle physics classes we were given Feynman rules without...

i made a speaker from a cup, a coil of wire and a magnet. I hooked up both of the ends of the wire to a headphone jack and it works. Albeit very low sound, but it works. Can you point me in the direction of some equations that will show me the most influential factors on how to make it louder...

Hi I'm very new to this so bear with me lol. I'm trying to plan out a project for building a diesel powered car and I want to use an of the shelf pneumatic starter for novelty but I don't know how much volume I need. So the starter requires 120 psi @500scfm. My idea is to use scuba tanks or...

Hello, I am The Maker. I am here because I want professional feedback on my work. I have been building things with K'NEX and popsicle sticks since I was little and as a future engineer, I wanted real engineers to evaluate my potential. Please be honest, I am trying to improve my engineering...

I am try to build a magnetic motor using a computer fan on the basis of a video I saw on YouTube. I have placed 4 neodymium magnets at the edges of the fans frame. However the fan has failed to spin from the magnetic field created by the magnets. How can I find the correct orientation in order...

I have seen a bunch of chimney and building demolition videos on youtube and what I typically see is that whenever they bring down a building with explosives especially in urban areas they make the structural elements cut in such a way as for the building to fall in its own footprint and the...

I've recently been developing a lot of static electricity and it's very annoying as I get shocked when i touch metal objects or other people. This isn't like it happens every time I touch something though. It just happens after I take off my jacket for example. So then I have to find some metal...

Homework Statement I was recently assigned a project of, tl;dr, building a wall to reduce the maximum force during a collision. Let me start by describing the setup as best as I can. First, here's an image: These aren't the exact track and carts we're using, but they provide a great...

I build my own computers. I've built and serviced many for others. There are some things I think are useful. - Always research. Don't automatically do something that someone says. Always research it thoroughly. There are almost always others who have had the same questions and often there are...

It's been years I don't have a desktop pc and now is the time I "need" one. My use will be numerical simulations, compiling general programs as well as latex documents, some lightweight/middleweight programming, using a virtual machine and use another OS's this way. I'll be using Linux only. My...

Perhaps this is the place to put this? I'm in the market for a new pc, and am thinking of doing it myself (this will be my first time building one from scratch). I'm fairly familiar with the components and what they do, but specifically, what I will need, that is where my real question lies...

Homework Statement A ball is thrown at the edge of the roof of a building in a direction at an "alpha" angle above the horizontal. It landed 5 seconds later at 50 meters from the building. The maximum height reached by the ball during its trajectory is 20 meters above the roof. Find The...

Homework Statement You are in a spaceship far from any other objects, and you want to build a clock. You decide to build your clock out of a spring with a mass attached to it. You use a spring with spring constant k = 138 N/m, and you initially displace the mass a distance x=25.0 cm from...

I'm trying to get some more work experience for my computer science resume since it's practically empty. All of the internships I've found so far are too demanding of my time since I'm a full time student. Would it be worth my time to create my own software and put that on my resume or should I...

I am performing a 2D analysis on a steel frame structure that is 8 storeys high using NZS 1170.5:2004 (New Zealand Standard for Earthquake Actions). How much of the original 3D structure's mass should be added to the 2D frame to make the analysis realistic? How should this mass be distributed...

I've started Book of Proof, the first chapter of which is an intro to sets. Q.1 Is there any particular way to approach these kinds of problems, other than using intuition / trial & error? I tend to have some difficulty in working out the best way to express the general term of a sequence, for...

I'd like to build my own reliable alarm clock, but I don't have any knowledge in electronics and no fancy equipment, only some humble C programming experience. What do I need and what do I need to know to build one myself. Thanks very much.

I am planning to make a drone in near time. I have absolutely zero pre-requisite knowledge of the technical stuff and drone designs. I am going to start with a basic drone. Can somebody help me out as to how many types of drones are there, where should I commence etc?

I've been trying to do research on the decay rate at which stuff starts looking like it's a hundred, and falling apart, but a brief attempt at a google search only gave me results for mostly articles about Olympic venues that have been abandoned. Which is nice but not exactly what I want. I...

Hey all, I'm a bit of a food geek and a DIY nut and I'm looking to build my own vacuum sealer for as cheap as possible. My question to you guys, is what is the cheapest material I can use that will still withstand the pressure as well as maintain the airtight seal needed? I am looking to get a...

The Physics group at my university is building an optical telescope (it will have a dome the size of an 8mX4m room and the mirror will have a diameter of about 65cm.) and we might also build a radio telescope or an array of telescopes which will work as one giant telescope. Also, I heard that we...

Hello to everyone, I've just started my PhD in Mechanical Engineering. And we've to buy a computing machine of high end to use ABAQUS and COMSOL software. Can anybody recommend the machines which can run these both software. P.S: We have to use Windows because there seems to be some graphics...

Back again. This time I'm looking to build a small catalog of Feynman diagrams for my own use (and when I'm done to put it on the Internet in PDF format). I need your help to get a list of URLs together that I can download the required PDF's off the internet, bring them into Illustrator and have...

I was idly thinking of Dyson Spheres and solar energy when this idea came to me: say you were technologically advanced enough to build a perfect, Dyson sphere and were able to deal with the problems of drift--in other words you belong to a really, technologically advanced civilization! It...

This is my first try at building everything myself. Programming the G Code to cut the chassis on my old Linux computer took a bit of thinking...lol Here is a short video. A few photos so far. I will post the schematic when I finish it. Cheers, Billy

I have been trying to build a small Van de Graaff generator based on the designs found here: http://rimstar.org/equip/build_make_van_de_graaff.htm Unfortunately I haven't been having much luck. How can I improve it...

Hi all, Over the summer I have been working hard to net some extra cash to acquire a desktop computer for education based purposes. Physics research, modelling, and coding is what to be expected. I am hoping to have this computer be my main setup for the end of undergraduate (2 years) and...

Hello everyone. This is a very simple project that I intend to build. It involves a cooler full of ice and water, two 120mm computer fans, a 240mm computer radiator and a 600 gallons per hour water pump. All these will run off the cars cigarette lighter rated at 12 Volts. I need your help to...

Hi, I want to repel a permanent Neo magnet using an electromagnet which i want to build. The distance from which it should repel is about 2 inches and to a height of 1 inch. So what would be the ideal gauge of copper wire and the number of turns on the MS rod as core, if i supply 12v DC through...

Lets say we have a car with no engine, just a shell. We want to create an extremely efficient electric vehicle. If we have unlimited resources and man power how would you go about making this vehicle?

ARS Technica reviewed the book Lab Girl about overcoming funding issues to build a world class lab and about being a woman scientist in today's world: http://arstechnica.com/science/2016/05/how-two-determined-scientists-built-a-world-class-lab-out-of-radio-shack-parts/

I came up with the idea today of using a prosthetic feet for my robot. The problem is that hardly anyone sells them online. What materials would I use to build one? The size is a regular shoe size. Something that looks like this. I'd like to make a very good quality one. Thanks in advance

What is the general cost for building a tesla coil. I already have a PVC pipe and wiring, but I know I need a board, power supply, coil, led lights, capacitors, resistors, and semi-conductors, etc. I know there are some things I am missing and I am on a budget. If there are any other supplies...

I am curious about the possibility of building a large permanent magnet that could exert a huge pushing/pulling force of about 135 million Newtons. In answering the questions, I wanted to have these following points addressed: 1. The magnet is 30m wide by 30m long...would have to push a...

Hi, recently I've been trying to think of a few ideas for my high school physics/astronomy club to build, and have heard that a magnetic leviator is completely doable. Are there any tips out there for building one? Materials, circuits, etc would help a whole lot. Thanks.

Hello. I am building a solar phone charger and have decided to use 3 Nimh batteries, a 5/6 v solar panel, a usb 5V rectifier and also a Lipo credit card rechargeable cell. My reasoning is limited for this build as the more I read, the more conflicting info I find... (Eg, charging AA batteries...

Hi! I have to build a capacitor out of the following materials: 10 square feet of aluminum foil, 10 square feet of saran wrap (polyvinyl chloride), several sheets of paper, and tape to put it all together. I will only have about 30 minutes to manufacture my design. I have been researching...

Has anyone attempted build a magnetic monopole? If you took a bunch of wedge-shaped permanent magnets and assembled them into a ball such that the same pole for each magnet was pointing out radially, then you would have a magnetic monopole. (see attached).

In the spirit of Einsteins happiest moment, I'm working on a new theory of gravity and would like to test a prediction of mine against the experts here at PF. We know that Bob standing on top of the empire state building close to Earth's gravity is aging slower than Major Tom floating out at...

Hello! As the title states, I want to get myself a new rig for simulating complex physical phenomena. Specifically, I'm going to run quantum chemistry/solid state physics/atomic physics calculations on it. I'm planning to re-use some parts of my old PC, and buy some new ones. I want to spend...

How do I estimate the height of the tall building spiderman swings to at 0:48? I need it for a physics assignment. What does you're intuition tell you? (I've never lived in a city full of buildings). Is there a way to estimate it using physics? I'm not sure that building actually exists.

Good afternoon. I need to know if the thermal power of the air extracted from a building is greater than 80kW. I know the flows entering and leaving the building. Also, I know the temperature of the air inside and outside the building. How do I calculate the power of the air extracted? thank you

This is a continuation of the archived thread from https://www.physicsforums.com/threads/how-to-make-inductor-coils.570700/. Judging by the list of needed coils, I suspect the author was looking to build VHR AM Aircraft Receiver as described here...

I'm hoping that some of you brilliant scientists can help me understand the realities of a world that I'm building for a story in a distant solar system... I’m building a sci-fi world for a story that takes place on a distant planet that is multiple times the size of earth, but hosts similar...

Multiple_Authors submitted a new PF Insights post Building a Definition for Heat Continue reading the Original PF Insights Post.