Board Definition and 288 Threads

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...

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

Homework Statement A physics teacher (mass 80.0 kg) stands at the end of his 2.0 m long diving board. The distortion of the free end is 22.5 cm. when his noisy neighbor comes over and stands at the end he distorts it by 32.0 cm. what is the mass of the noisy neighbor? Mass of teacher = 80.0...

Here's the computer that i have http://www.geeks.com/details.asp?invtid=AM3100-U3201A-R&cm_mmc=geekmail-_-newarrivals_html-_-07jun08-_-AM3100-U3201A-R&AID=10445123&CJPID=4176654 and i recently took the mother board out of the acer and put it in a knew case. I have the motherboard specs for the...

This is what i want to do that i need the manual. I want a sweet looking computer even though I'm not a true gamer. I found the case working at Mission central tearing down computer it was very nice looking on the outside so i kept it. It had a mother board in it and i will try to upload the...

I want to build a EEG and the site tells me to buy a PCB from some manufacturer. Will my product have competent performance if built with breadboard? What is so special about PCB？

Hi all, I have a general question about board breaking. This is not homework. Can anyone explain why it hurts more not breaking the board, compared to breaking the board. I know that there are already threads about this topic. However, I am confused about the different explanations: 1...

I'm doing AQA Physics A unit 5 next Monday, and I've been doing some past papers but I'm not sure about how to answer questions on the energy released in nuclear reactions. The mark schemes say that the energy released is equal to the change of binding energy per nucleon but I thought that the...

In the following MIT video, some kind of thick chalk (not sidewalk, already tried it) is used in the lecture: http://ocw.mit.edu/courses/mathematics/18-01-single-variable-calculus-fall-2006/video-lectures/lecture-2-limits/ It looks like great chalk. Or what chalk is this easy to write with?

Homework Statement A diver jumps off a 5m high diving board. The diver enters the water 1.5seconds later. Taking g=10m/s^2 determine (a) the speed he generates in his jump (b)his maximum height measured from the top of the diving board (c) the speed with which he enters the water...

Homework Statement I have a knight on a chess board that is 5x5. I have numbered each position on the board by the amount of steps it takes from that position to get back to the centre. It looks roughly like this ##\begin{array}{ccccc} 4 & 1 & 2 & 1 & 4 \\ 1 & 2 & 3 & 2 & 1 \\ 2 & 3 & 0 &...

Homework Statement Two identical rollers are mounted with their axes parallel, in a horizontal plane, a distance 2d = 26.5 cm apart. The two rollers are rotating inwardly at the top with the same angular speed (w). A long uniform board is laid across them in a direction perpendicular to their...

What kind of engine do I need to build a "flying board"? Hi there, I'm pretty much new here and I've been making lots of research about engines, ion engines, turbines etc. But I still don't understand. I want to build a steel board, since I have the facility to work with any kind of metal...

Homework Statement A body of mass m_A=2 kg is placed on a long board of mass m_B=8 kg at distance d=1 m from the rear edge of the board. The friction coefficient between the body and the board is μ=0.2. A force of magnitude 30 N is applied to the front edge of the board and the body start...

This is just a scenario I have been pondering. Imagine one took a board and placed it on a pivot in perfect equilibrium. Next they added two 10KG weights 1 inch out, on each side of the pivot. The board would probably not snap with the weights at this distance, but let's say one were to...

I was wondering if anyone knew of the potential downsides of using this material to replace a piece of 1/4 low carbon steel that is decaying and is a backing plate inside a hull of a 28 foot sailboat. I would be replacing it with 1/2" G10/FR4 fiberglass board minimum and could go to 3/4 inch if...

Homework Statement Calculate the forces F (A) and F (B) that the supports exert on the diving board of the figure when a 62 kg person stands at its tip. Ignore the weight of the board. Assume that x-axis points upward. Homework Equations F = ma The Attempt at a Solution F (B) =...

Homework Statement Calculate the torque (magnitude and direction) about the front support post (B) of a diving board , exerted by a 60 kg person 3.0 m from that post. See picture. Homework Equations τ = Fr The Attempt at a Solution τ clockwise = τ counterclockwise (60...

I'm currently taking a Microprocessor course and we are adding to our breadboard week by week. The most recent add on was a UT6264CPCL RAM chip. Other chip specifications are given below in in 2. Homework Equations . My question is, how do we test to make sure that the RAM is working using two...

Saw this puzzle during an interview for programmers. Thought it was kind of clever. Can the domino tile the chessboard with no overlaps, no overhangs and no half tiles? If so, how can you prove it? If not, how can you prove it? No, this is not a trick question (or trick answer).

new to this project and have limited knowledge, but the failure is consistent thru all specimens so I am hoping someone could shed some light. Film cap design is rated to 1650v Failure- Cap initially failed around 800v consistently, the curing time was adjusted and a ramping cycle was...

Hello all, I had a lab pertaining to LOGIC gates, and the instructor drew something on the board (without elaborating) and asked us if we knew the significance of what he had drawn on the board. No one knew, and as such we moved on. However, I am now wondering. Attached is what he had drawn. To...

Homework Statement Two blocks are connected by a string as in the figure below. What is the upper block's acceleration if the coefficient of kinetic friction between the block and the table is 0.10? Express your answer to two significant figures and include the appropriate units...

Hi Everyone I have a PICDEM 2 Plus board with a PIC18F4620 on it. My UART code is given. The code worked perfectly fine the first time i programmed my chip but stopped working after that. With Hyperterminal the error is : "Unable to open COMPORT 1. Please check your port setting"...

a board charged with superficial density σ is in YZ and X=0. another board with a thickness of D(0<X<D) sticks to him with a volumed density ρ(x,y,z)=μ*X. The electric field out of the charged area is zero. I have to find the elec field inside the board:i made a little gauss cylinder inside the...

I am trying to create a plinko launcher for my plinko board (as you would see in the price is right). I created a pinball type spring launcher and used a bell crank in order to change the horizontal force into a vertical force. I am using a 3.5in spring with a spring constant of 1.09lbs/in. I...

I'm having issues with this simple circuit. If you look in the top left corner of the image attached, I have a dremel tool powering an 18vdc motor which puts out current at 1.96 amps. Then it goes to a switch. The wires then go to an 8 ohm resistor(white rectangle) then to a 4700μF...

Hey guys, To give myself some background before posting this, I've read through the "Personal Theories" and "Crackpot Forum" Suggestion threads, and re-read the relevant Global Guidelines. So, if this idea just doesn't meet the forum vision, I understand. Having said that... I think there's a...

I'm designing a circuit that consists of the following: AT Mega 128L 2 to 6 CPLDs SD Card Interface 100 to 200 MOSFETs Power circuitry I should add that I already have a 2-layer prototype of the board and it works well. However, the prototype does not have the MOSFETs and the SD...

Homework Statement A diver can change his rotational inertia by drawing his arms and legs close to his body in the tuck position. After he leaves the diving board (with some unknown angular velocity), he pulls himself into a ball as closely as possible and makes 2.34 complete rotations in...

I have a few questions about graduate schools that are across the board. My apologies for the lack of focus. First, some academic info. Currently, I'm a junior in a mid-level state school in New York. I'm currently pursuing a BS in applied mathematics with a minor in applied statistics...

How to find out contact time of 2 Carrom men in carrom board game? I am trying to develop a game of carrom board. For this i want to know how to find contact time if Co-efficient of restitution and velocities before contact is known?

I'm completely new to these fourms, have a rudimentary understanding of geometry, and wasn't sure where to post this question, so appologies if this is the wrong forum, I'd be appreciative if you could direct me to the right place. My question is whether it is possible to create a circular or...

Homework Statement I notice practically all the questions are really math, not physics. Is there a real physics homework forum? Homework Equations Like F = ma or ΔS = ∫dQ/T ... like that? The Attempt at a Solution Not up to me ...

A board lies on top of 2 uniform cylinders that lie on a fixed plane inclined at an angle theta. The board has mass m and each of the cylinders has mass m/2. The system is released from rest. If there is no sipping between any of the surfaces, what is the acceleration of the board. Solve using...

Greetings, I have recently bought a roboduino http://store.curiousinventor.com/all-kits/roboduino-kit-servo-ready-freeduino-arduino-compatible.html . I have tried uploading programs from my computer (a Dell Inspiron 1525 Vista) using Arduino 0022, however it does not seem to work. At first...

Hello, I am confused as to how to determine the accuracy of a measurement of an AC signal from a Data Acquistion Board. I went to NI's website to look at the the specifications of the board I was using (a USB-6009) http://sine.ni.com/ds/app/doc/p/id/ds-218/lang/en#header0", and I don't know...

Homework Statement Two men are carrying a board that is 2 m long and 71 kg mass. Man one is at the end of board mand 2 is 0.6 m from other end and hanging from the end is and object which has a force of 200 N. What are the forces on the two men? Homework Equations Also says to draw a...

Homework Statement A 3m board is carried and has a weight of 32N. 1.8m sticks out behind the carriers shoulder,1.2m in front and his hand is 0.4m from the shoulder.How much downward force needs to be applied at the hand to stabilise the board. Assume the weight is evenly distributed along the...

I run into the dilemma of having a great hand and then a possible flush hits, so I tried to calculate the probability of a single opponent having a flush when the board has 3 suited cards by the river. I used the old 1-(unhelpful cards/unseen cards) trick, but my answer seems too high, and I...

Ok so I'm going to start this by saying I'm a mechanical engineer and circuits don't make very much sense to me. (So your help is very appreciated) I'm currently designing a board game and I need to be able to program a large amount of led's. Basically, I have 217 holes in a gameboard that...

Is there a PCIe cable system available that attaches to a standard PCIe Board Edge Connector or Mother Board PCIe slot? I see Molex has the iPass cabling system for PCIe board to board connections. But based on the Molex connection pinning (68pins for x8 PCIe) it is more of a custom solution...

I saw some protoboards at fry that say "gold plated" on them. Can these contacts be soldered to? It doesn't seem like solder would be able to bond with gold plating, but if not, what good is the protoboard?

Homework Statement A rectangular poster is to be made out of cardboard. The margins on the top and the bottom will be 2 inches. The margins on the sides will be 1 inch. the are of the poster devoted to the printed material must be 300 square inches. (a) To the nearest .001 inches, find...

Homework Statement A long uniform board weighs 62.6 N (12.5 lbs) rests on a support at its mid point. Two children weighing 317.0 N (63.4 lbs) and 500.0 N (100.0 lbs) stand on the board so that the board is balanced. What is the upward force exerted on the board by the support? Homework...

Homework Statement A uniform board of length and mass lies near a boundary that separates two regions. In region 1, the coefficient of kinetic friction between the board and the surface is , and in region 2, the coefficient is . The positive direction is shown in the figure...

I'm sure this is something so simple, but I've failed to find answer elsewhere, even doing several google searches "circle on circuit board", "diagram of circuit", etc... What is the circle at the end of a wire\line on a circuit board? (the actual circuit board, not a diagram\drawing of one)...

Hello there! I have a situation as follows: [PLAIN]http://img821.imageshack.us/img821/4026/kuglananagibu.gif I have to find the period of oscillation of the system. I've know how to set the equations for when solving the equations with forces, but am lost when trying to solve it with energy...

hey, I'm in a grade 12 probability and statistics class, and I've been assigned to create a board game and calculate the probability of winning. All my ideas get to complicated and I am finding my self confused so I am trying to keep it relatively simple. It is a board game where the first...

hi my question is : A 85-kg diver walks to the end of a diving board. The board, which is 3.5 m long with a mass of 14 kg, is supported at the center of mass of the board and at one end. What are the forces on the two supports? answer it with drawing please