Building Definition and 891 Threads

I KNOW that this has been asked many times before so I will put it in a way that is not as similar as the rest. My true goal is a bit far fetched so I will just say that I would like to build a time machine. What my question is, which should I study the most, and mainly in college because I am a...

Hello all. I am looking to build a new PC. I really know very little about computers, but since my degree seems to be leading me into the computational realm, that will need to change quickly. Instead of just *building* a PC and going through the motions, I would really like to *learn* what...

hey all, for a science league competition, my team-mates and I are tasked with building a turbine that will draw as much power from a box-fan as possible. Every team has been given an identical motor and the rules specify that we can't modify the motor at all. I've asked around and it seems...

Hi guys. I'm doing a high school project for AP Calc BC. We're supposed to build a 3-D solid using Riemann approximations. Basically, we have to build an object using solely rectangular prisms, or circles. Prompt: Make a physical model of a solid with a known cross-section. For example, let's...

Im not sure if this should go here, but. . . Im building a motion detector. I have the breadboard hooked up the following way using an op amp, a potentiometer, photocells, resistor and led. http://img6.imageshack.us/i/breadboard.jpg/ So it seems to work fine, but I wanted to...

I need to build a toothpick model that can hold a 16 pound bowling ball. I have no idea where to begin, does anyone know of somewhere I can find a tutorial or something?

Homework Statement I need to build a telescope from two magnifying lens, one is 2x the other is 5x. First I need to give the total magnification possible, state which lens to use as the objective and finally to state the length of the telescope. Homework Equations l Ml = Fo/Fe total...

Hello All, I'm currently working on a project to help with a local spaghetti bridge contest. I'm trying to build a scale of sorts from a plate that is supported at each end. Picture a bracket "[" but with the two legs on the ground. I'm using strain gages on the bottom in the shape of...

Hi physics folks- Every year for the past 3 years, I have built an ice rink in my back yard. Unfortunately, I do not have the flattest back yard, in fact it has quite a downward slope and then a steep uphill slope. But, I'm determined the make the biggest rink I can reasonably make, given...

I have a few questions. 1. Which programming language should I use? I am thinking of using C++. I know assembly but am not very good at it, so I am trying to avoid assembly. 2. Which program should i use to compile the PIC code? I am thinking of using MPLAB IDE. Is it sufficient/ok? 3...

If a ball is thrown upwards, another straight out, and another downwards, which will reach the ground with the highest velocity? After thinking about this for a while my conclusion is that they all will have the same velocity since they all have the same initial gravitational potential energy...

I need to make a bridge using Balsa Wood, but I can't decide whether to use the Howe or Pratt Truss. Requirements maximum mass of 25 grams maximum test load will be 15kg must allow a 5.0 (∼2”) cm cube to pass along the roadway without touching the structure must be an opening at the...

Homework Statement Hey I'm building a graph of period squared vs. mass for simple harmonic motion finding the slope and getting K for a spring. since T^2 = ((4*pi^2)/k)m the slope is (4*pi^2)/k so I get my slope from my graph and it has an uncertainty of +- 0.2 to get K we...

Hello forum , i want to ask you a simple question , i am building a circuit on a bread board, the circuit is an H bridge 8A , is normal bread board can handle this current or the connection inside the bread board will be in not safe mode ? Thanks for reply, Have a nice day

Homework Statement A vertical building was built on a horizontal plane. The plane is then tilted to A=(0,0,0) B=(1,2,0) and C=(0,3,1). By what angle (in radians) does the building now deviate from the vertical? Homework Equations Dot Product Cross Product The Attempt at a...

Hi I hope that this won't be treated like spam or something. I just used search engine to find place where I can find people who may be interested to help me building something that I call "valve library". I started small website with intention to create online place where You can find all...

Homework Statement A 72 kg person escapes from a burning building by jumping from a window 30 m above a catching net. The acceleration of gravity is 9.81 m/s2. Assuming that air resistance is simply a constant 88 N force on the person during the fall, determine the person’s velocity just...

This is not homework, although I am an EE student. If the solution is cool/complex enough, this might become a design project, although it'll most likely end up as something to do over the summer. some time ago, I purchased a motorized doggie door. The dog wore a high frequency sound...

I am very interested in engineering, so I decided to build a mousetrap vehicle. I want my vehicle to reach 5 meters and return back to its original destination by itself. I need help constructing this system to accomplish this goal. Is there any way to build it with 2 mousetrap at most?

Homework Statement a spotlight won the ground shines on a wall 12 m away if am man 2 m tall walks from the spotlight towards the building at a speed of 1.6 m/s how fast is the length of his shadow on the building decreasing when he si 4 m from the building? Homework Equations using...

Homework Statement At the top of the building that's 65m high, a guy throws a ball upward. The ball comes back down and hits the ground in 4 seconds. A)What is the initial velocity when the guy threw the ball? B)What is the highest height of the ball? C)At what time does the ball comes...

I have already built most of the chopper but am trying to add an accelerometer. Let's say the blade is rotating at 600rpm, this is causing vibrations throughout the vehicle at 10hz. I want to make a compartment which doesn't feel most of these vibrations. I'm thinking of building something using...

heyy guys i am participating in an aero competition in which the problem stmt is to design an acrobatic hand launched rc plane of wingspan 3 ft max which can perform stunts like a vertical loop, sharp turns and 360 roll...can you please tell me how to begin designing this aircraft...i...

1. A 0.43 kg rock is projected from the edge of the top of a building with an initial velocity of 9.2 m/s at an angle 45◦ above the horizontal. Due to gravity, the rock strikes the ground at a horizontal distance of 14.9 m from the base of the building. How tall is the building? Assume the...

hi guys i want to make a device consists of - a motor - stick (60 cm long, 0.4 Kg) - remote control - step motor to pull a rope -buttries the idea is the main motor rotates the stick for seconds or for a minute. and the step motor pulls the rope 360 or 720 degrees. and all these...

Homework Statement A rock is projected from the edge of the top of a building with an initial velocity of 18.4 m/s at an angle of 35◦ above the horizontal. The rock strikes the ground a horizontal distance of 96 m from the base of the building. The acceleration of gravity is 9.8 m/s2 ...

Since the SABLE project broke on slashdot and youtube, I've been kind of keeping an eye on the tech, and science these average Joe's put into it. (I'm one of these average Joe's). For those not familiar what these projects, here's an overview. The SABLE and BEAR projects basically strap a...

I would like to construct this thing: http://www.thereminworld.com/pics/schematics/simple.jpg However, I am unsure of the chips to use: *Can I assume the 4093 is going to be a nand quad gate? (say: http://www.thereminworld.com/pics/schematics/simple.jpg) For the 4077, what about this...

So apparently Michio Kaku built a 2.3-million-electron-volt particle accelerator in his parents' garage; once Harvard University found out about this they granted him admission. I'd like to go to Harvard. So if I were to build a particle accelerator would I be breaking any laws, or is it...

A golf ball is released from rest from the top of a very tall building. Choose a coordinate system whose origin is at the starting point of the ball, and whose y-axis points vertically upward. The acceleration of gravity is 9.8 m/s 2 . Neglecting air resistance, calculate the ve-...

Homework Statement Please help me with this problem: Rock is thrown straight up with a velocity of 24 m/s from the edge of a building. The rock is moving at 43 m/s when it strikes the ground. Acceleration is 9.8 m/s^2. How tall is the building? I know it involves the equations of...

dman gman vman zman are leaving in a 4 floor building one on each floor. its known that gman is leaving under vman and dman. zman is leaves under dman and above vman. on which floor each one of the persons leave?

I have a minor bit of circuit experience. As a fun project id like to build a shortwave radio. Does anybody have any tips on where to start.

http://www.bloomberg.com/apps/news?pid=20601080&sid=aF3XI.TvlsJk http://www.scientificamerican.com/blog/60-second-science/post.cfm?id=why-not-spend-21-billion-on-solar-p-2009-09-02 Well this should be interesting. Japan is one of the leading nations in nuclear power and is not afraid to make...

Homework Statement perform a calculation for an object moving vertically in air under gravity and experiencing a retarding force proportional to the square of the objects speed. see (W=.5(cwpAv2) Object is dropped off a 100 meter building from rest. radius of object = .0366m mass = .145...

I'm making a small-scale aquaponics system at home (except I'm not eating the fish). There might be some random chemicals that will probably leech into the water from the materials I used (plumbing parts degrading/oxidizing, etc.), or had directly added (I used household ammonia to begin the...

For the same building with square vs. circular concrete columns of equal number and cross-sectional area, under what environmental conditions would one be preferred over the other?

For a given spatial volume and amount of material, what practical structural design conserves temperature best?

I have been looking through the forum for help on working out what i would need to build an electromagnet to certain specifications, but as i have not done anymore than a grade nine level physics frankly I don't understand most of what's in the posts. So if you reply can you break the physics...

Ok so for those of you who have followed my recent threads, you will know that i am trying to find practical ways of obtaining a 16 kA DC pulse to create a magnetizing field. I have tried to locate a strong spot welder, but the DC pulse is three phase and results in a non uniform magnetic field...

I know that answers to the following can sometimes be subjective and biased... but still... What are the most 'promising' models in string theory, judged by the potential realization of a realistic SS standard model? Also, in particular, how do Intersecting Brane Models (since their...

What have you built from junk/ stuff laying about your garage or whatever. My next project is to build one of them ( ionic wind) lifters from bits i can find or salvage.

I'm trying to build a C or H-frame electromagnet that produces a flux of 1.4T in the gap between its two poles. (See: http://cyclotron.lbl.gov/images/Cyclotron%20yoke.JPG ) But I can't find any references on building C/H-frame electromagnets. I calculated with permittivity of free space...

Hii Iam new in this field, Please I want to build 1/4 wave cables and cross diodes together to stop high power at 90 MHz frequency for exaample, I want help how can I build some thing like this and what is the equations to choose the right length depending on the frequency...

I'm not kidding. Two black vehicles, serious looking, and men in black suits are right outside. Should I post a pic or will that piss them off? Something's up. There aren't too many people in my apartment building, so they're probably here for me. Maybe. I've got to come up with something...

Building Materials Refractive Index?? Hi all, does anybody know the refractive indices of these materials (used in houses)? - Wall bricks - Wood (used in doors) - Glass - Plastic - Concrete (in ceiling and floor) and any other common materials :) thanks in advance

Hi everyone I work for a very small company, which produces steel products. Predominately from one particular hot rolled steel profile. (1040 grade) We currently subcontract our hot rolling to small chinese operators :( I know... At this stage our volumes are not large enough to warrant...

Im new to this forum and wanted to see what you think about my new patent pending design. My concept is...using a 2.5Mw wind turbine, refit 110'L rotor blades with a 10-12' diameter of concave vanes or paddles designed to capture max air thru a forced ducted system that is generated from a large...

Hello everyone, I hope I came to the right place for this type of question. Please assume that I am completely ignorant with regards to circuits/electronics (although if you can go into further detail, that would be very helpful in the long run). I am looking to build a simple miniaturized...

Hello I'm a visual artist and I'm trying to make a project were I need to add a sound to a photograph hang to a wall in a picture frame.The source of the sound it will be a ipod (unless someone has a better idea)I need to build a device to make the music from the ipod place in the narrow place...