Assistance Definition and 204 Threads

I am trying to create a ladder of resistors that is connected to a set of buttons where when pushed (by themselves or in combination) will give me different voltages (which will then be measure by a micro controller). I need 16 combinations in total. I am currently using the attached circuit, I...

Homework Statement I am trying to create a MATLAB program that propagates the solar system when given initial velocity and position. I have successfully implemented a Runge-Kutta 4th order integrator but would like to see the difference when moving to an adaptive time step method. I think my...

I'm given that i1=5.4A and i2=1.5A. I know that I need to apply mesh-current and then nodal-voltage analysis, but I have never dealt with two current sources. It seems like however I set it up, I am missing a piece. My first attempt at a KVL equation using mesh analysis incorrectly...

I would like to ask if it is permissible to post a request for paid assistance? I do not want to contravene the rules or regulations of the forum so decided to ask first. The assistance would be completion of an assignment for payment.

Hi,The problem I am trying to solve is in a section on first order ODEs. It is problem 25 in section 2.1 of Boyce & DiPrima's Elementary Diff Eq (5th Ed). The problem serves as an introduction to the variation of parameters, but again, it is in the first section of the book that introduces first...

Hey everyone! I am on a 15 day industrial training in an organization, which is involved in designing and fabricating dairy and pharmaceutical process components. Right now, i m in component engg. department, where the design and documentation of dairy components takes place. Prsently i am...

Hi all, Thank you for the pleasure of being part of this forum. I'm sorry if this is in the wrong area, please feel free to move this post if it is. I'm in the process of creating a science fiction novel and I need some help please. Very simply, Earth has over time destroyed itself and...

Homework Statement Hi, Just wondering if anyone knows how to solve the following as I am not sure where to start at all: y''' + 8y = xsin(2x) Any help would be great. Homework Equations The Attempt at a Solution I'm thinking solving the homogeneous DE y'''+8y = 0 and...

The problem I am currently trying to right a lab report on a experiment trying to find a flywheels moment of inertia. In the lab we had a fly wheel connected to a mass on a string, and measured the position of a point on the wheel as the mass was accelerating downwards. The data was analysed...

Hi, can somebody help me with the following problem: Thank you. :)

Assistance required about MS "PortMon" software Hi; I want to capture data following via RS232 port (in Hex form) of my Laptop for an application. Hyperterminal don't fulfill my requirement. There is a software named "PortMon" of Microsoft is available but i am facing a problem with this...

An outsider begging for assistance -- motorcycle acceleration I have a math problem that, I believe if completed successfully, will save my life. B_____________________________________________________________________A The distance from Point A to Point B is 640ft. Starting...

I was recently told that the integral for a 3-momentum d^3p = 4∏∫p^2 dp But I don't know what how is this integtal done. Any help?

Hi, First time poster and I believe that the people on this forum may have a greater chance of solving this riddle or making sense of we have so far. http://imgur.com/eUAete2 http://imgur.com/eUAete2 I am more than happy to go into the background of all of this, but in short, this is...

International Physics Olympiad (Preparation)? Hey I'm a Danish student, who will start 11th grade after summer. I intend to get to the International Physics Olympiad 2014. I'm familiar with almost the whole syllabus, but I'm not strong in calculus yet (I know basics of differential...

I wanted to design a wheelchair that can move without the use of the arms. Instead I wanted to design a chair that can be controlled using a person's body weight, like a segway. Apart from using micro-sensors and computers like a segway does can anybody think of another way of designing a...

Hello all, I'm putting the finishing touches on a gravity fed irrigation system and I would like some informed input on my design. The system starts at a creek about 500 feet uphill of my garden. The creek usually dries up during the driest parts of the year, which means I need a reservoir...

Hi i am doing a side project of displaying RPM speed on the Altera development board DE0 which i have running at 10MHZ. i have got a digital input from a hall effect sensor that has a frequency range from 1.6 to 166.6 Hz. the signal incoming has a duty cycle of 50% to calculate the...

Dear all, I am new to this forum and this is my first post. I hope this is the right place to open this topic. I have a homework for my mathematical methods for physics course and i am kind of stuck into a question: v=ψ∇β show that ∇xv is perpendicular to v. Here v is a vector x is cross...

So I've received all of my grad school offers and it is time to make a decision. Of the four schools that I am seriously considering, two of them are offering much higher financial assistance which includes tuition and no TA duties (both schools in the states). The other two schools (Canadian)...

Hi all, I'm having some problems trying to simulate a pendulum in C++. I am using x,y coordinates (and not angular coordinates, velocity...) to use the same method than all other dynamics in my program which are: - Compute sum of all forces - a = sum(F) - v += a - position += v For the...

Homework Statement ∫x3e5x2 dx Homework Equations uv-∫vdv The Attempt at a Solution I've tried this one a few times, but keep getting answers that are just out there. Could someone, if possible, work out just the beginning.

I'm writing something, and I need some assistance. Namely, I want it to be at least moderatly accurate to real life physics, so I would appreciate it if someone could give me an insight on how real-world physics would work in the following situations. First - what would happen if a human...

math assignment help please

Homework Statement Define a sequence of numbers Ai by: A0 = 2, An+1 = An/2 + 1/An (for n greater than or equal to 1). Prove that An less than or equal to √(2) + 1/2n for all n greater than or equal to 0. I think it's a safe bet that induction should be used here. I'm having trouble finding the...

Hi, I am undertaking an undergrad design project and want to ensure I'm doing this correctly, I have derived the ODE as shown below; A*Y = M*X'' + (B+C)*X' + D*X Where A,M,B,C,D are constants. By taking the Laplace transform, I get; A*Y(s) = M*s^2*X(s) + (B+C)*s*X(s) + D*X(s)...

Homework Statement A square-based rectangular prism has a total surface area of 54cm^2. Determine the side lengths if the volume is a maximum and hence find the volume. I have done a number of these and I am getting really annoyed because I always get all the sides being equal no matter...

Homework Statement Given the function f(x) = Acos(∏x/L), find its Fourier series Homework Equations Okay so, f(x) is even, so the Fourier series is given by: f(x) = a0 + \sumancos(nx) where a0 = 1/∏\int f(x).dx with bounds ∏ and -∏ and an = 1/∏\int f(x)cos(nx).dx with bounds ∏...

Homework Statement I'm working a problem that involves a predator-prey relationship scenario. There will be a total of 600 "steps" and I need to calculate the population count for each step. At this point, I'm just trying to calculate the prey population count for step one. It's been...

Hey, I am new to this forum hoping that I can get some help with a project. I also hope to be accepted as a new member, hopefully learning from everyone here. I am sorry to ask a simple question that may be easy. I am learning and experimenting as a hobby, I do not have access to super accurate...

Having significant issues with solving these problems. Any help is appreciated. Thanks to all who can help! 1. How large must the coefficient of static friction be between the tires and the road if a car is to round a level curve of radius 75 m at a speed of 90 km/h? I used the...

hi iam 19 yr old after 2 months iam going to join an engg college in india,as i want to work abroad so i don't know which field is working good in foreign markets..need help asap

Hello! New poster here with a problem (No, not a homework, its a tinker problem) Basically, I've been trying to work out how much thrust would be required to lift 150kg and make it fly around (jetpack hypothetical), assuming that there is zero lift and constant thrust from the engine/s on...

I had recently received an exam back rom my kinematics unit in my physics course, this is the only question that I answered and was incorrect. I was wondering if someone could assist me on what steps I am missing. The correct answer is 3.2m, but I can't figure out how to get to it. A ball...

Hi all, I am building a model in Abaqus and wondered if somone could assist with the units I need to enter. I have built my parts using mm as the dimension, i.e. part is 10 units (mm) wide. (To clarify this can also be entered as metres as in 10e-3, however I chose to be consistent with...

I was conferred my Doctor of Engineering (EngD) in Nov. 2011. I am now planning to apply for Chartership in the UK; however I live in the U.S. and do not know any other CEng's in the UK to be my Proposer! Any advice?

Hey, I'm having a bit of trouble with a Free Body Diagram question and I'm not sure if I'm going about it properly. The question asks; A 82kg couch is being pushed with a force of 56N at an angle of 40 degrees above the horizontal. If the coefficient of friction between the couch and...

Hey, I'm having a bit of trouble with a Free Body Diagram question and I'm not sure if I'm going about it properly. The question asks; A 82kg couch is being pushed with a force of 56N at an angle of 40 degrees above the horizontal. If the coefficient of friction between the couch and...

Hi, I would like my workings for inertia and torque checked, and advice on formula if you would be so kind. I have an aluminium disc of 300mm diameter and 8mm thick and a mass of 1.58Kg. To work out the inertia I have used the formula: I = 0.5m*r^2 I= 0.79*0.0225 I= 0.0178 Kg m^2...

Homework Statement Nitric Acid is produced via the following equation: 3NO_2 + H_2O \rightarrow 2HNO_3 + NO How many grams of NO_2 are required to produce 7.50 grams of HNO_3? Homework Equations HNO_3 = 138 amu NO_2 = 126 amu The Attempt at a Solution I think I have a...

I am building a moving target system for a shooting range. It will have a 40 foot target moving perpendicular to the shooter. I have not had any problem with fabricating the target system, but I want to go above what the customer requires. Hopefully this lead to more work for myself in the...

Homework Statement Hello this is my first post. Im currently studying towards a level three national diploma in engineering operations. I need some assistance with a mechanical principles problem. ( A crude drawing of the problem has been attached haha) I need to work out the direct and...

Hi everyone, I have this assignment which involves drawing this circuit schematic of a diagram that is put together on a bread board. Only thing is, however, that I do not understand how a breadboard works, therefore it makes this task really difficult. Can someone help me explain how this must...

Homework Statement I have the integral \int sin(2.13\sqrt{x}+2.4)\,dx I'm supposed to use the substitution y=2.13\sqrt{x}+2.4, aka. \sqrt{x}=\frac {y-2.4}{2.13} to gain the following description of the integral: \int sin(2.13\sqrt{x}+2.4)\,dx = E cos(y) + F\int y sin(y)\,dy I have...

Hello All, A friend and I took on a senior project design that is certainly proving to be more difficult than anticipated. Here are the details: Design Challenge: Self Balancing Motorcycle Description: A picture of our prototype is attached. The motorcycle is remote controlled with...

I would like to apologize in advance if this is posted in the wrong category. I am currently participating in NaNoWriMo with a story that I hope to finish and submit for publishing. It is of the Science Fiction genre, however, and I do not have the working knowledge of certain things that I...

How can we make a best resume to apply for undergraduate research assistance? I sent a message to professor and he said to send a resume. How can I make a best resume? The program is about: Assist with behavioral neuroscience testing of husbandry laboratory rats. Duties include tube/slide...

Hi guys! Kinda stuck here.. I'm trying to plot the temporal temperature distribution across a metal rod of length 1 meter. The rod is heated at one end and the temperature is measured every 5 cm along the meter rod every 10 minutes for an hour. Basically I have 6 text files, each...

Simple PDE... I'm trying to solve the PDE: \frac{\partial^2 f(x,t)}{\partial x^2}=\frac{\partial f(x,t)}{\partial t} with x \in [-1,1] and boundary conditions f(1,t)=f(-1,t)=0. Thought that e^{i(kx-\omega t)} would work, but that obviously does not fit with the boundary conditions. Has...

[1] When self studying, do you memorize vocabulary words and things like that? This isn't like taking a course where the teacher tells you what to memorize and what will be on the test. When self studying how do you separate the stuff? Or do you literally study the material "inside out" as in...