Building Definition and 919 Threads

Hey, I never used to like electronics, but after doing a unit last semester it has really interested me. I've gone out and bought simple circuit components and have built a whole heap of simple circuits just because I wanted to learn more of how things behave. Anyway I still have the notes...

Greetings, its the noob again:) Recently I had a discussion with a friend of mine who claimed that he knew how to set up his own computer (putting the parts together, not making the parts themselves). When I asked him if he's ever done it, he said no, but he said that he knows what most of...

For my project I need to transform the power from a 3000 watt, 120V AC generator to a high voltage DC, say 30,000V DC. Are such transformers easily made or of low cost? Bob Clark

I'm Currently Making A Water Rocket And I Want To Obtain More Information About The Factors That Might Affect It From Launching Higher. Thanks For Your Help Really Appreciate It.

Can anyone provide advice for this? We will be putting them in the school's pool and racing them. But I really want some advice. (1) Formulas to find if the boat will float or sink (we'll be able to make measurements and stuff). (2) Plan ideas. (3) Stuff to focus on in building. We...

Does anyone can help me on this please? Ball A is dropped from the top of building at the same instant the ball B is thrown vertically upward from the ground.When the balls collide,they are moving in the same direction,and the speed of A is 4 times that of B.At what fraction of the height of...

Which of the following are true ? (a) Proteins range from a MW from about 3,000 to 1.0e6 g/mol (b) Fibrous proteins are the main component of Muscle,hair and cartilage (c) Building blocks of proteins are the beta-amino acids (d) Polar amino acid side...

Hey, I bought a Western Digital hard drive to put into an enclosure. I have an HP pavilion zv5000 notebook. I have no idea what jumper setting on the hard drive I should use. Should I leave it as cable select, move it to master, or call tech support? The box from the enclosure says...

If I decided to build a rocketship would you guys help me? How about if I made a totally safe wormhole connecting Holland, Colorado, London, and Guam? We could build it in my backyard. Sh*t we could go to the moon, and do the moonwalk, in a moonwalk, on the moon. We'd have to play football with...

Is there any free E-Book or online resources for building simple robots ?

Hey guys, I was wondering what is the best way to build muscle if I run the track. Is it wise to eat a lot of fat, then run my buttocks off for the muscle? Or eat light and low carbs and low calories? What becomes muscles then?

This thread is a continuation of my previous thread, except this one is primarily focusing on the contruction of an amp hour meter and programming it, rather than the gathering of parts for it. (since the parts have just arrived, very slow mail order) I am getting very confused when looking...

Seeing as the US is a good and nice capitalist system... and you seem to be able to buy practically anything otherwise... does anyone build WW2 aircraft? Wouldn't it be so cool to buy like an F4 Corsair... Hell if i had the money, id buy one just to stare at outside...

hello. i have to build a "quake tower" for my high school physics class. it must be made from bolsa wood and be able to hold something like 10 pounds and be put on a vibrating table and not collapse. has anyone ever done a project like this before? do you recommend any specific designs? any...

there is a three story building, with a total of 12 people in it. it rained. and the roof leaked. the people from the third floor asked the second floor people if they could go down to the second floor. the second floor people then said they could only acomodate (on the second floor) the same...

i am building a human powered boat for my physics class. does anyone have any design tips or powering mechinisms that could be of use? please help me!

does anyone know of recycleable materials (strongest and less dense than water) that can be used to build a human powered boat?

Hi guys! I need to design and build a traffic light with an accompanying DC power supply. The DC power supply must be a 5V source obtained from a 240V AC (50 Hz) mains source with a short circuit current of 200mA. This will be used to drive a digital logic circuit controlling the traffic...

Hello, I would like to build a basic automated robot. Is there any recommendations on what resources I should look at? Edit: Currently, my objectives for the robot is: -Ability to move along a 2-D flat surface (with wheels) -Able to pick up and transfer an erasor (using optical (IR)...

im working on building a simple thermal energy storage system...im using water as phase change material.The PCM will be injected into spherical capsules and dropped into a storage tank.Now my problem is that the freezing process initiates only at arnd -12 C.Remember it is under pressure...

Hi I'm trying to build a simple circuit but my physics is shaky. Could someone be kind enough to take a look at what I've done and notice any rookie mistakes? Thanks! The top side is positive.

Hey everyone, I'm building a rocket with my friend from scratch. I have calculated the specific impulse of the rocket engine that we have designed and it turned out to be around 235 Newton-seconds. I was wondering what the maximum weight of rocket this engine would get off the ground, and...

Does anyone have any tips on how to make/build a mouse trap car, with the mouse trap being the only source of energy? I have an idea of what it should look like, and how it should work, but I'm really not sure. Is there any helpful hints that I might need while building my project for my physics...

Does anyone know how to make a bone oscillator for the use of bone conduction? Thanks.

I'm building a cart which must be powered by TWO elastic bands only, it must ran at least 2 meters, which isn't hard, but my goal is at least 12 meters, which isn't very hard either(the longer the better). I have some ideas of how to power the cart and please help me to choose...

Does anyone know anything about building roller coasters on Roller Coaster Tycoon? We have to build them in Physics and I'm stuck on finding the sum of PE and KE for the model.

http://www.newscientist.com/news/news.jsp?id=ns99996781 "The construction of what will be the world's tallest building is set to begin in Dubai, United Arab Emirates" "The Burj Dubai tower will stand 800 metres tall - just 5 metres shy of half a mile - once completed in 2008. That will be a...

Hey, my physics teacher handed us this assigment and said have fun. He didn't explain what to do or go over how bridges work. So I was wondering if anyone here has done something similar to this. I believe I can work out the design, but what kind of pasta and glue would be most appropiate to get...

I have a problem where one reading is 743mm at the top of the building and 760mm at the bottom of building. In order to find the height of the building I tried getting the difference of the two readings and multiply by the density of the mercury that it contains. I should come up with 179 m...

Hey i was wondering if anyone had any sites on how to build a Spark Gap Radio Transmitter, i need to do this for history to show how marconi invented the radio. Thanks- Andrew

hey guys, I have been looking to make a outdoor led washlight for a long time now. I am not very experienced with electronic circuts but I can understand the basics. I am planning to have 30 leds, 10 each of red green blue. I want to control the three different colors with a potentiometer...

Hi everyone. I would like to build my own foundry, if possible to melt iron. From all the research that I have done, I can see that almost everyone opts to melt aluminum, even when it comes to building a metal lathe. The reason why I would like to melt iron/steel is that I am also wanting to...

A 50 story building is being planned. It is to be 200 m high with a base 56 m by 70 m. Its total mass will be about 1.8 X10^7 kg and its weight therefore about 1.8 108 N. Suppose a 200 km/h wind exerts a force of 1000 N/m2 over the 70 m wide face (Fig. 12-86). Calculate the torque about the...

Few weeks ago there was that huge fire in a high rise tower in Caracas/Venezuela,does that building collapsed?

Alright, so I have finally decided to buy a new computer. I am going to build it myself. But I have a question. I currently have a dell dimesion 4100. All that I am going to buy new is a mother board with a p4 processor, ram, a dvd burner, and hard drive. Can I just take the mother board...

There are 1,050,000 marbles. If the marbles are used to stack into a 3-sided pyramid, and every level of the pyramid is 2 cm high. How many centimeters tall can the pyramid get?

more kinetics :( sigh here's another one i thought i knew how to do but i ended up with the wrong answer. A brick is dropped from the roof of a building. Twenty meters below the point of release is the top of a window. How long will it take the brick to pass in front of the window which is...

A rock is shot vertically up froma building and starts falling back to Earth after 1.60 seconds. After 6.00 seconds, it hits the ground. Constant acelleration of 9.81 m / s^2. a. What is initial velocity? b. What is max height above building? c. How tall is the building? I got the...

Is there any reason not to build nuclear power plants underground? All of the ones I know of (http://pravda.ru/main/2002/02/05/36613.html) are all above ground - if there’s a problem like meltdown, it gets scattered all around. My thinking is that if we build these things underground this...

I'm not sure if this should be in Physics or HMWK Help. If it is not in the right place, please move it. In my Concep. Physics class, we've been assigned a project: We have to build a 21 cm. tower that can support a general baseball at 21cm above the surface of what the tower is on. We...

I want to build a tesla coil for my school's science fair. Is there some way you can make the Tesla coil safe and not extremely dangerous and deadly? I don’t want to kill myself :eek: ! Does anyone have any tips or advise? ~Thanks

I know it may be ambitious, but my astronomy club is considering building a small observatory. nothing to special, but something good enough that can be built is a shortish space of time (hopefully a few months in the spring and summer) but can be enlarged or enhanced in the future provided...

smalest cell ? what is the smallest cell in the human's body ? regards abc

Are there any relations between these two trees ?? Where can i find source code to build a splay tree ? I have heard that if we applied the ideas of SINGLE ROTATION and DOUBLE ROTATION which are used in AVL tree, we can then build SPLAY tree easier, is this correct ? Thanks a lot for any...

http://www.subterrane.com/howto/howtohbomb.shtml It's a bit old this one but still, it's funny! Also, can this "recipe" theoretically work if I were to try it out (not that I am!). ALso, anyone else got any interesting sites with stuff like this??

OK as you can tell I am 12 but fairly smart (wink,wink) This summer me and my friends plan to have a huge neighborhood water gun fight and I plan on building a waterballoon launching Trebuchet about 3 or 4 feet heigh. I need some help with the materials I should use and the weight of the well...

I’ve been working on some electroGrav theories and am now wanting to start building models to try and test these theories. I’ve a 8ft satellite dish that I was thinking on using as a mold, but have no good ideas on how to go about this. As like a “UFO”, I need to create a top and bottom...

I am looking into building a hovercraft, but i have virtually no idea where to begin. I could use a bit of help. Perhaps something that uses magnets... Thanks for any help.

Hello, I am in the process of building a set of speakers (not my first pair), however I have run into a little bit of an issue. The tweeter I am using has a built in crossover, which cuts out the lower-end frequencies. If I am to wire both the tweeter and the woofer in series, the woofer...

my goal is to make a mod 60 counter using mod10 and mod6. Both counters have a clk input. Mod10 will count and will produce a cout which will carry to mod6. At this moment, mod10 will be 0 while mod6 is 1 which is 10. This will continue to 59. I need serious help on how to connect them...