Building Definition and 919 Threads

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...

Okay, we need to build an instrument that we can play a song with. The audience needs to recognize the song in order for us to get full points. You can't use any instrument parts and the instrument must be constructed from scratch. I was thinking about making a tubed instrument like this...

so my class is going to build motors tomorrow, and we will have about an hour to build a simple motor, and we are supposed to find instructions for building a motor. Can someone give me instructions for building a simple motor, probably with wire, batteries and magnets, and other materials...

Hi All, I'm building a balloon car and I'm in need of ways to increase the speed of the car. Here's a description: Attach a balloon to a car. Rave the balloon powered car over 3 meters. The car must move on its wheels and the sole source of propulsion must be provided by the balloon...

I don't pay my electricity bill so if I build a sterling engine going out into the -40 degree weather...

Homework Statement My question is, if your at the top of an apartment building, maybe the 10th floor, and you have a cup of water in your hand or on the table. Does the water have a higher gravitational potential energy than a cup of water at ground level? Homework Equations The...

Im in high school now taking AP calc AB, AP phys C mechanics, and AP chem, and the typical english/social studies classes. I am doing this cause i like math and science. My dream schedule would have been AP calc BC, AP phys C and B, AP chem, AP bio, and probably AP stats or envi sci. This is...

We Are Trying To Design A Grinding/polishing Machine To Manufacture Concave Mirrors Upto 1.5 M Dia Does Anybody Have Any Plans For Construction

Homework Statement This is one more problem I made to entertain myself. I am at the highest floor of a building near a window. There is strong wind outside. The pressure inside is approximately the atmospheric pressure, but outside it is less because the air is flowing, so by Bernoulli's...

Building a Speaker...New member ok, well firstly let me introduce myself; I am a new member here, I am by no means a physics/engineering person...but I got myself stuck in grade 12 physics and I am almost through the semester. Now we've got this assignment to build a speaker or headphones from...

Homework Statement In physics class, we are now starting to build free standing newspaper bridges. We are allowed to use only newspaper and glue, but we can use as much of those as possible, as long as it meets the following conditions: 1. It must be less than 254 g (don't ask me why)...

Americans have detained several senior Iranian military officials in Iraq. What's interesting about this is less what they had in their possession when captured (U.S. won't say) or what threat they were suspected off (won't speculate), but more that the executive branch was surprisingly quick to...

Neglecting air resistance, calculate the position (in meters) and velocity (in m/s) of a golf ball that is dropped from the empire state building after 1.0s, 2.0s, and 3.0 s with the release point.

Hello everyone. I"m having troubles figuring out this recurrance relationship. The problem is the following: A set of bloks contains blocks of heights 1, 2, and 4 inches. Imaigne constructing towers by piling blocks of dferent heights directly on top of one another. (A tower of height 6...

How should I be going about this problem? Here is the question, diagram, and my work: A 50-story building is being planned. It is to be 200m high with a base 40m by 70m. Its total mass will be about 1.8X10^7 kg and its weight therefore about 1.8X10^8 N. Suppose a 200km/h wind exerts a force of...

Hey, this isn't a homework question but is more for help with a project. For our D.E. class we decided to model a building while it is being impacted by an earthquake. We are going to make up a building to use. Anyway, we are having trouble relating the earthquake to the building. We know that...

I need help/advice on building a simple projectile launcher, for a tennis ball or smaller object. I need to calculate the angle so it must be something that shoots fairly straight (ballista?). Any links or advice on this would be much appreciated ~Hans

Build a GUI to accept integers (when the ENTER key is depressed) into an arr ay of 15 int; have a button called AVERAGE; when AVERAGE is selected, there is a display of the count and the current average; have a button called CLEA R; when CLEAR is selected, count is set to 0 and so are all...

BALL FOUNTAIN--need help! Hi, my partner and I are doing a senior project and we are creating a ball fountain. A ball fountain is simply a perfect sphere sitting on a ring that's perfectly matched to the sphere with water shooting up from the bottom and the sphere can begin to spin. Now my...

building a "hybrid" and dynamic mathematical space Hello, Maybe I'm going to say very stupid or crazy thing for real mathematicians (I'm an architect): I want to build a concept that I call "dynamic abstract space" ("das" from now) for a digital architecture project. I would like to be able...

I need ti build an apparatus that will move from one table top to a second table top over a two foot gap. The apparatus can have no stored eergy other than gravitational potential energy. Springs or other items that depend on a spring-like mechanism to provide thrust will not be permitted. No...

2 dead AFAIK, one being Yankee's pitcher Cory Lidle

I want to build a cloud chamber. I have tried one approach for which I found directions online. Unfortunately it didn't work out for me. In short, I used an empty pickle jar with felt glued into the bottom of the jar. I poured in 91% Isopropyl alcohol to saturate the felt. I screwed the...

Hey all. I'm not sure of the best forum to post this in, so I am putting it here. I was wondering if anyone knows anything about or any resources for building a "homemade" AFM? It wouldn't need to be state-of-the-art or even all that good. Just good enough to show undergrads how they work...

So I'm sure you all know that the building Dana lived in in Ghostbusters was built as an antenna for psychokinetic (or whatever) energy, focusing that energy on the 13th floor... Well, I was in a new client's building in Philly a couple of days ago and the facilities guys took us to one...

Hallo... everyone... straight to the problem, ok! I'm now building an egg incubator box, sized 100cm cubic. And i provide its heat with a set (4 pieces) light bulb. And now, what i like to know is: Any equation or formula to determine how long it took to warm up the whole box? Thanks...

we were asked to build a submarine as a requirement to pass our physics subjct... the problem is.we don't know how to start, and what materials(simple and not expensive by the way) should we use:frown: also our prof said that it is going to be a race (and it will be uhm..1week frm now)and we...

hey all, im building a trebuchet and i wanted a litte advice on slings. my trebuchet is about 7 feet tall with a 12 foot arm; i wanted to know if anyone had experience in trebuchets and if they could help me with the sling, or direct me to somewhere with that info. thanks...

Should i be able to replace those large stationary "dee" magnets with electromagntes? (or would that be a grand misuse of the powersupply, as i know i will need to supply an ample amount to the electron gun, and the current which i need to accelerate the particles, rather than simply keep them...