Board Definition and 282 Threads

Sorry for silly question, but have been wondering. Diving board it is bolted to the ground(base platform) (vertically), why not assume it as fix. the way bolt is secured is same direction as the load, hence it is not easy/resist to rotate up and down like pin or hinge. so there is moment. Isn't?

Hello, I'm looking for advanced single board computer supporting Android and Linux OS based on the Freescale SoC. I would like to hear any recommendations from users who have had experiences with them.

A heavy board is fixed to another flat surface along its entire upper edge and not moving. How can I find the tension force that is acting on the board? Is it the same as if the board would be fixed to a string in the middle of the upper edge and hung and then the tension would be T=mg?

I think it would be lots of fun to design some physics versions of the Monopoly board. Feel free to discuss your physics monopoly board ideas and suggestions and even try it yourself by downloading the board image here http://ecx.images-amazon.com/images/I/81oC5pYhh2L._SL1500_.jpg And then...

A standard 8x8 chess board has but a lone rook in the bottom left corner. A rook a piece than can move any number of spaces either horizontally or vertically. If the rook can only move up and to the right, how many possible paths does it have to the top right corner? I think it's a pretty...

Can anyone help me create a strip board design for this circuit please? It would be greatly appreciated!

http://imgur.com/Tj3wKiy Circuit: http://imgur.com/Tj3wKiy What needed to be built.http://imgur.com/6uw12n5 http://imgur.com/6uw12n5 http://imgur.com/6uw12n5'][/PLAIN] The chip being used is an LM741CN. Scheme Of Pins can be found here Thanks, AP

I was doing some online early-ish Christmas shopping for the kiddo and wife-o. I randomly came across this: http://littlebits.cc/ I thought it was pretty cool, and I figured some people here would appreciate it too :). (For those who don't wish to click on the link, it's basically magnetic...

Hello all, as the title states I'm trying to build an arduino powered chess board. The chess pieces will have magnets on the bottom and each square of the board will be equipped with a reed switch for detecting the presence of the magnetic field produced by the magnet. I recently tried this out...

HUVR tech

When I connect a DC power supply to a board, why do I get a spark. I connect the ground terminal first and then the Vcc terminal(24V). When I connect Vcc with an alligator clip, I get a spark. Is it because of charging of the bulk storage capacitor?

I am doing a project in my institute, which happens to be compulsory for every student that takes the course. Unfortunately,while experimenting with some electronics, I fried a circuit board which costs around 9 euros/12 US dollars. How does student ethics fit into this scenario? It was...

Homework Statement A 7kg cat walks to the end of a 15 kg board resting on two saw horses as shown below. When the cat is at the 1m position as shown, the board “just” lifts off of the left hand support. How long is the board? Homework Equations T = D x F The Attempt at a...

Hey guys, I'm looking for examples of real life systems which uses a board with holes to redirect cables in tension (as opposed to pulleys) for some inspiration on a project I'm working on. I've attached an schematic of what I mean. I've tried searching google for systems but it's a hard...

Homework Statement How many ways can two red and four blue rooks be placed on an 8-by-8 chessboard so that no two rooks can attack one another. Homework Equations 1)Number of permutations with two types=(n choose n1)=n!/((n1!)(n-n11)) 2)Number of ways to place n rooks which have k...

During exploring the Electrical Transmission and Distribution Network I came across the following terms. "Supply, installation, testing and commissioning of LV 600V/1000V insulation grade Panel Board consisting of following but not limited. I). 2700A single bus bar. II). 2x2700A Off...

Hi everyone can anyone help me in my code. I am trying to program a altera DE0 board to measure distance using a SRF05(ultrasonic range finder). I have written a code but now I am stuck. #include "sys/alt_stdio.h" //for the alt_putstr function below. Outputs to Eclipse console...

Determining truth of "555 watt" amplifier board My math is showing that this amplifier is not 555watts but 140watts at 8 ohm at +-36v and 555 watts when shorting the output with ground. What do you guys think? amplifier board...

Homework Statement A small box of mass m1 is sitting on a board of mass m2 and length L. The board rests on a frictionless horizontal surface. The coefficient of static friction between the board and the box is, as usual, less than μs. The board is pulled with a force F, as shown. We wish...

Hi guys, So i just bought a L298N motor driver board and I'm planing to connect it to a stepper motor. I'm wondering what kind of stepper motor should i use? The one that has 4 wires or 6 wires? Btw, what's the difference with bipolar and unipolar stepper motor? I'm planing to control it...

This is a tachometer circuit from an early 80's Honda accord. I twisted the yellow and blue leads together and was able to get the tach to work (retrofitted into another older Honda that only came with a mechanical tach option). The twisted pair was ran off of the negative of the coil...

I am building a uav drone for a high school competition and I have the arduino uno R3 board but other websites said I need the ardupilot board. Can I build it with the arduino uno and do you know the materials I would need for the mechanical and electrical aspects of the drone? And if you also...

This question came up in a textbook and not everyone agrees on the solution. The question is: "A 63 kg diver is standing on a diving board waiting to commence her dive. The diving board has compressed 8.0 cm. Determine the elastic potential energy of the diver." The solution given by the...

A diver steps off a platform at 7.5m above a 4.97 deep pool what is the minimum constant acceleration in the water so the diver won't hit the bottom

"Microprocessor development board" and "Embedded System" same thing? Hi guys, I'm doing a final project and ran into a bit of a terminology challenge. Basically, the question is this: Is there a difference between "Microprocessor development board" and "Embedded System", or are they synonymous?

Homework Statement A diver jumps off a 3.00 meter high diving board with an initial velocity of 1.75 m/s vertically upward. a) What is the diver's veolcity when she reaches the water? (assume the surface of the water is 3.00 meters below the board.) b) What is the highest point the diver...

Homework Statement You stand at the end of a long board of length L. The board rests on a frictionless frozen surface of a pond. You want to jump to the opposite end of the board. What is the minimum take-off speed v measured with respect to the pond that would allow you to accomplish that...

Hello, Is there a rule to figure out what direction a force must be applied in a torque problem? Here's a specific example with a question: In this video, how did he get the direction of F1 and F2? Like how did he know it was pointing...

In another thread (https://www.physicsforums.com/showthread.php?t=699767) matqkks mentions curriculum changes in calculus and linear algebra: My impression of math education (in the USA) is that a few large school districts control what's "mainstream" teaching in secondary mathematics and...

I am not sure if I am allowed to post these kinds of questions here (cause I see mostly hypothetical ones, but then again I didn't look too far down the page...) but I just have a quick question for you guys. I am trying to desolder some electrical components from a board but I don't have...

Homework Statement A diving board of length L is supported at a point a distance x from the end, and a diver weighing w1 stands at the free end (Figure 1) . The diving board is of uniform cross section and weighs w2. (Figure 1) Find the force at the support point. Find the force at the end...

I've just thought of a way to get the right komi in the game of go. Let 2 programs that plays randomly play each other millions of times, for different values of komi. A game should take less than 1 second I guess since there's basically almost no computing process for each move. Then "make...

Imagine a 8x8 chess board, is it possible to place 8 pawns such that they are of different distances from one another?

I am looking to work with a raspberry pi board to do some basic and eventually more complex things, what are the best types of things to attempt / what type of raspberry pi board is the best to purchase for a starter? As for the boards themselves I am aware that are quite powerful and I have...

I'm not an EE. I'm a Software Engineer. I would like to build a small circuit that would leach power from an active 2.5v Ethernet line to charge a capacitor very slowly (over a timespan of 1-2 minutes). When the capacitor is fully charged, it would then discharge at 5.5v to power a circuit...

Homework Statement Hi, I've been having trouble setting up an oscilloscope, with a AC voltage supply, to a breadbox, with a "black box" in the circuit. the black box is just a set of 3 pairs of terminals, each a "unknown component" such as a diode, capacitor, resistor, etc. Basically I need...

Hey guys, I might be in over my head on this one but I was looking for an electronics project... I really just into this kind of stuff and plan on majoring in electronics engineering. I just purchased a Microcontroller Programmer & Experiment Board (by Velleman) at Radioshack because it looked...

Homework Statement See image: http://s18.postimage.org/6ql2zlo2x/board_n_cylinders.png The Attempt at a Solution I know it says conservation of energy but I just wanted to do it in terms of torque and forces first. The reason I'm not sure about my answer is because I barely had to use more...

Homework Statement Hi, I'm an electrical engineering degree student from Perlis University, Malaysia (UniMAP) and I'm currently doing a Final Year Project. The title is Active Power Factor Correction. I'm evaluating a Boost APFC Board from STMicroelectronics model EVL6562A-TM-80W. The problem...

Homework Statement Board AB is fixed to the wall through 6 screws as described in the drawing. Beams CD and DE are connected to the board by joints at points C, D, E. At point D acts a vertical force of 7500 [N]. Calculate: A) The reaction forces at joints C, E. B) Describe the external...

What is the Difference between Substrate & Base material in Printed Circuit Board? What is the difference between Substrate material in PCB and in semiconductor [VLSI] ?Is the VLSI substrate Cu plate? Is the substrate of VLSI a fibre glass or it is something else? What is the base...

Homework Statement I need to get E_{b} = .5(m*n*V^{2}_{i})/(m+n) [eq 6] where E_{b} is the energy required to break the board, m is the mass of the object hitting the boards, n is the mass of the board and V_{i} is the velocity of the object before hitting the board. Homework Equations...

Hi What do you think is the best way to test an Arduino sketch without uploading to the board? ie. What is the best piece of software available? I’m currently writing an Arduino sketch and it would be very usefull if I could test it without having to upload it to the actual Arduino board...

HI : good to see you everybody ,I am a new comer on this board Being a math teacher ,I always trained my students with various difficult problems from now on I am going to post a sequential challenging questions for people to share most of them I know the answer and the solution of it , maybe...

Hi All, I was searching for Analysis course that typically follows Spivak's Calculus. While searching the Net came across this post below and have couple questions if you don't mind: My questions: 1. "Rigorous Advanced Calculus (Loomis and Sternberg)". Is that a single book or two...

This is the problem: http://oi47.tinypic.com/6qij4o.jpg I set fx, fy, and B equal to zero. 'x' forces: Fx - Bsin(30) = 0 'y' forces: Fy - mg + B(cos(30)) = 0 lower end: -0.5*mg(cos(30)) + 0.4*B = 0 Using the third equation I solved for B, and got -477.4. I then plugged B into the...

Hye everyone! An unknown thick-and-sticky green liquid was found leaked from 2 out of 9 feeders, of our 132 kV Switchgear. The liquid was leaked through the cable gland that connected to the Secondary Terminal Board insulating cap of the Current Transformer, at the GIS. I had done: 1)...

Homework Statement A 250-kg board, 2.4 m in length slides broadside along the surface of ice with a speed of 21m/s . A 63 kg man at rest grabs one end as it goes past and hangs on as both he and the beam go spinning down the ice. Assume frictionless motion, and assume that the man can be...

I'm planning on making a magnetic levitron, but I'm very new at all of this, so I have no idea what type of circuit board I should get and where I should get it. I know how to solder already, so that's not an issue. This is the website that has instructions on making the levitron, with a circuit...

Homework Statement A small box of mass 1 is sitting on a board of mass 2 and length L . The board rests on a frictionless horizontal surface. The coefficient of static friction between the board and the box is Us . The coefficient of kinetic friction between the board and the box is, as usual...