Building Definition and 891 Threads

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.

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...

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...

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...

I am a car audio installer. So everything I work with runs off of 12VDC. I wanted to make some fun audio related experiments and film them. One experiment I was thinking of doing was making a bunch of lemon batteries and running a car audio CD player off of them. But I recently learned that...

I am a double major in EE and physics and I was thinking that a great senior project would be to design and build my own mass spectrometer. I would not only like to build the basic device, but also calibrate the device so that it provides the m/q value based on the radius of curvature caused by...

I am building a Trebuchet That is made out of steel and is about 8 feet tall, with a 1000 pound weight. here is what i need to know. I want it to throw a 20 to 30 pound object 300 ft or more. What Does the length of the arm with the weight and the length of the trowing arm have to be. To...

i have had an idea for a few years and am finally starting to go forward with it.. i need to know if it is possible to build an ion propulsion unit at home. being that it is on the Earth and not in space does it need a defuser? can it be made to run on 110v? i don't need it huge to start. i just...

Today I'd like to draw the attention to the end of the last glacial period. Those who have looked at ice core graphs may recall that the Antarctic ice cores appeared to react first around 17,000 years ago and then with a relative mild change in isotope values (interpreted as temperature change)...

Here's a little challenge: You need to build a bridge to fill a 40-cm gap. The bridge must be able to support 1kg for 10 seconds and flex no more than 2.5 cm. Your budget is $95 million. Materials given are 18-cm straws at $1m, 18-cm toothpicks at 18-cm each at $5m, 6-cm toothpicks at $20m...

im trying to produce about 270degrees celcius and have a 12v 500ma adapter i plug into the wall, I've wound the wire from a toaster round a nail, imn not getting enough heat though. I've tryed 5 small lenghts in parallel a single long piece, a single short piece... so tell me, what...

Hi, I need some help/ideas/direction... I need to build a pulse generator that is capable of generating a peak current between 100A~1000A that lasts for about 0.5ns and can be ready to pulse again in 0.5ns so the frequency of operation is around 1Ghz Help! Thanks

Hey everyone! I have a project going on with a friend...a hifi tube amp! yeehaw! Im going to start small the 60 watt range (30 per channel) and am wondering if anyone has any recommended reading for tube amp circuits, i need a book that gets right down into the dirt of tubes so that i can...

I ordered all my parts for my new airplane today. It's a J-3 Piper Cub with an 80" wingspan. Normally it runs on a .46 glow fuel motor, but I am going to run it on an electric motor instead. (Not an easy conversion process) http://www.uploadfile.info/uploads/a3c80b0987.jpg It's a fun...

Hi, I like to build a Farnsworth-Hirsch-Fusor for a school project. I want to use an ordinary bell jar but I am not quite sure if it will work at the pressure I need (0.1-10pa). Does anybody know how much pressure a bell jar can take?

hi i hope this post is in the correct forum as i am new here. i am doing a home project and building custom cabinet/trunk that opens like a car hood. i am in the process of buying gas springs to ease in the closing and opening of the door/lid (and to stay open when at the top position). i...

According to recent news reports, the U.S. military is planning on a very long stay in Iraq. According to my local paper that 6000 seat dining facility is costing $14 million and much of the concrete mentioned was poured by Turkish? workers. HI HO Haliburton. This war is about oil, it...

I am building an autoranging digital voltmeter as the subject line suggests and am having a problem with the ICL7107 chip that I am using. Looking at figure 15 on: http://www.intersil.com/data/fn/fn3082.pdf specifically RefHI and RefLO, with a 2V max input difference between the pos and neg...

Hi! I have one question about dams When building a dam with clay core you must prepare that core ( so the moisture would be optimal , geomechanical characteristics would be satisfied and that sort of things,don't have time to elaborate all) I have heard on lectures that there are two ways to...

i have to build a vehicle "powered soely by gravitational potential energy that will travel at least a linewar distance of 5 meters under its own power. no elastic potential energy (such as a mousetrap) allowed" i was wondering if anyone out there had any idea on where to start or knew of a...

im practically lost in physics and need some help. it would be greatly appreciated. A ball is thrown upward from the top of a 25.6 m tall building. The ball's initial speed is 12 m/s. At the same instant, a person is running on the ground at a distance of 29.4 m from the building. What must...

I make Daguerreotypes (http://en.wikipedia.org/wiki/Daguerreotype) and I have decided that I want to move from the standard flat-plane photography and make images on silver domes instead. I have domes that are 1.85" in diameter and I want to replicate the effect that a garden gazing ball gives...

Does anyone know any good software to calculate the need for cooling/heating and such in builidings? One where I can change properties of almost every building aspect, such as wall-thickness, insulation, sun conditions, windows, outside temp, inside temp, and so on to find the energy needed to...

Hi, I'm building a rocket, and my team is planning to use airbags to protect the tanks from crushing during landing. I'm a newbie at this, and I want to know where I should start:) Thanks

Hey for a project, i have to build a sensor of any sort, and then make loads of measurements to see how accurate it is ect, what do you think would be a good sensor to build. it needs to be complex but not extreme! i am in 6th form takes A.s physics! any ideas would be greatfull. thanks alex!

Here's a picture of Mt Carmel College of Nursing in Columbus, OH. Pretty impressive looking. Mt Carmel College of Nursing The medical staff surrounding the patient is a nice touch. Arch closeup What makes it more impressive is what the building looked like before the renovation. Mt...

It is s(t)=245+24.5t-4.9t(sqrd) meters from the ground (t) after it is thrown. s(t) = displacement function that describes the position of the ball from the ground at time t. Determine height of building, time it takes the ball to reach the ground and the velocity when it hits the ground.I've...

Hi, I built a 7.2 V battery pack using two rechargeable 3.6V dc batteries. They eventually died and I purchased some different new 3.6 V replacements. Unfortunately, when these are charged they pump out a total of 8+ volts and shut down my device. I'm an electronics dummy other than the...

For a school project I have to build a device made of only toothpicks and glue gun glue that will hold an egg. The device will be dropped 5 meters and the egg must not break, so the idea is to build a device with a good crumple zone. I have a few ideas about how to build it but its pretty hard...