Issues Definition and 429 Threads

LaTeX don't work with Spoiler. Why ?

Homework Statement A wire lies along the piecewise linear curve extending from the point (2,2) to the point (12,4) to the point (12,9). If the density of the wire is given by (xy)=2xy+6x, use a line integral to find the mass of the wire. Homework Equations The Attempt at a Solution...

So I heard that some physics and astronomy graduate programs are going through major funding issues right now. For example, one school I know only accepted about 5 students out of 150 for the phD admissions this year for their Astronomy dept (they're haven't been super-competitive like that in...

I am trying to solve the tension in the cable system and I can not get to the answer. See attached file for question 4-4 and 4-6. I have no clue as to what to do with the 100 kg weight on the 4-4 problem. As for 4-6. I came up with 7 T at the p arrow, and when I multiply that to 3 for...

Consider the space curve x = cos t, y = sin t, z = sin^2 t. (1) Without plotting this curve, show that this curve lies on the cylinder x^2 + y^2 = 1. (2) Plot this curve (without the cylinder), then use the appropriate rotations to see the planar projections on the xy-plane, the xz-plane and...

Got issues? Dependency? Abuse? Control? Letting go, giving up, giving in? Grandiosity, narcissism, neurosis, nefariousness, spitting on people? Obsession, compulsion, bad dreams, daydreaming, hair splitting, nail biting, biting other people's nails, Dodgers fan? Here's your chance to generally...

Homework Statement A 138 cm length of string has a mass of 4.98 g. It is stretched with a tension of 6.35 N between fixed supports. What is the wave speed for this string? What is the lowest resonant frequency of that wave? (wavelength) = 138cm = 1.38m M = 4.98g = 0.00498kg Ft =...

hi there, how can i show that the lie brocket is not connection? Many thanks =)))

First off, let me apologize in advance because I'm pretty sure this isn't the right forum for this question, but I've tried to find an appropriate forum and haven't had a lot of success. I know some people here have been really helpful to me in the past, so I figured that someone could at least...

Hi everyone, I didn't know where to really post this but I have an essay which I must write for an engineering course which relates to land tenures. I need to find an article which has enough information for me to write and essay or other sources. Is anyone familiar with any land tenure...

Assignment: TicTacToe and TicTacToeGame. The TicTacToe class contains a 3x3 two-dimensional array of integers. The constructor should initialize the empty board to all zeros. It should have a method playerMove that accepts two integers as parameters, the first is the player (1 or 2) and the...

Just a few concise questions...I'd really appreciate anyone's input here.. How often is it regular (to you, personally) to feel inadequate or have low self-esteem? Regardless of how often...how do you deal with low self-esteem/body image/adequacy issues? Does the magnitude of the...

Homework Statement Integrate from 0 to sqrt(pi/2). I can't figure out how to make the LaTeX work correctly for it, so it just looks like an indefinite integral. \int 7\theta^3cos(\theta^2) d\theta Homework Equations \int udv = uv - \int vdu The Attempt at a Solution First...

So i know instruments need A TON OF PRACTICE but the problem with me is that i get bored too fast to play instruments. I've been practicing on my guitar now for 3 months but man i can only play it for 30 minutes tops and then i get seriously bored and start going on the computer. I can't help it...

Homework Statement You are driving to the grocery store at 16 m/s. You are 130 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.50 s and that your car brakes with constant acceleration. x1 = 0 m v1 = 16 m/s t1 = 0 s x2 = ? v2 = 16 m/s t2 =...

Bear with me if you notice any botched ideas in my writing, I'm working on it. Initially I was wondering about direct injection of ATP. But I ran into a roadblock... First - Is it possible to isolate ATP from a source and make a high concentration ATP solution or even pure ATP? (extraction...

OK, I posted here a while back with issues home networking, specifically between varying operating systems (Ubuntu 10.04, Windows XP, Windows Vista, and Windows 7...sigh). Either way, suddenly the other day, I was on my desktop and noticed that I could find my girlfriends Windows XP machine...

Hi everyone. It's my first time posting in here. I have a mathematica notebook that defines a four-parameter prob density function (PDF). I define a likelihood function, import some data, and run a Nelder-Mead optimization strategy on the likelihood function using the data. My likelihood...

i am trying to write a program that encodes and decodes. my code works fine for encoding 1 string of characters with no spaces, but when there is any type of white space, it fails. also, when i try to decode, i get a random mix of characters and symbols. any help would be appreciated. for...

Hey there PF, as you can see I am newly registered here, but I have been floating around for a little while now reading the forums. That being said, I come to you today in hopes that I can get some answers and resolve these problems I have regarding String Theory. I just recently finished...

I've read the (a?) MATLAB file on memory on their webiste. Basically, their advice deals with data generation, which I'm not having a problem with. I generated the data sets quite easily on my 64-bit dual core, while simultaneously posting on physicsforums and playing muds. But once I got the...

Hi! For long time I have doubt about shipping.This is an option in most telivisons' MFG menus.. When I was repairing my hyundai TV remote.I just pressed down a key on board which was not given on case of remote.The whole colour was changed reddish.I then went deep in the options colour...

I'm a student, and I had to do a freefall program. But I'm having some issues with variables. As soon as a subroutine ends, they go bananas! The problematic trio is 'y','v' and 'nshow'. When the subroutine Euler ends, 'v' gets the module of y, y go to zero and nshow to 32767! How can I fix...

We are rigging up a power cord for a cordless drill for work. This is necessary because the batteries are starting to die on some of the models. We rigged it up so we can plug the drill into a variable DC power supply. We can control the voltage and amperage output on this power supply. When...

So there are two vector problems that seem to be classic: someone trying to swim across a river that is flowing and an airplane flying with a given wind. For example, one might say a swimmer is swimming at 1m/s across a river with a .5m/s flow of water. Of course, you do the exercise to find you...

Im having some trouble with these conversions, specifically numbers out of the -127 to 128 range, and numbers with bases that are not 10. My book is asking for the 2's complement of -19210 and -458 in 8 bits. Here is my work. -19210 19210 = 110000002 (Do I add on another 0 on the left...

Hi,I am new here^^17 years old... I got a little problem with understanding how simple alternating currents motors/AC Motors work... Anyone has a good Table or Figure?? Magnetic problems: 1)Whats the difference between inducing current and normal electric current?? 2)Whats the meaning...

my view. The current theory of the higgs field is based on the higgs boson. Now a boson, in theory has to conform to the rules of super-fluidity or a Bose-Einstein Cond. I can confer because of this, All higgs bosons, would be interlocked as a field acting as one particle. I can say that since...

Im having some four-vector definition issues. I have a relativity exam coming up and they quite often ask about 4-vectors. 1) Does this definition sound ok? 'A four-vector is 4 numbers, say X=(X0, X1, X2, X3), used to describe an event in minkowski space. The 'zeroth' is the time component...

This was a test problem on an exam of mine. The problem asks for you to find the current through the 8 ohm resistor, which is 2.5 amps. I can solve the circuit by superposition or by source transformation and then reduction, but I cannot seem to solve it with mesh analysis. I defined three...

I have the following example that I need to compile in using Verilogger Pro. The example is that of a 4-bit universal shift register. We are told to take the code from our textbook and create a test bench. I am not worried about test bench at this time, I am having problems compiling the...

I didn't know if it would make sense to split this into two separate threads, so I've combined my two questions. My first question deals with test taking problems I'm experiencing with Calc. 1. The way we get grades in my class is 80% tests and 20% quizzes. In turn, this means all homework the...

I'm working on a robot for my final project in class. It's your basic line following deal. It has 5 sensors that face the floor on the front and it just follows a track made of black tape. I'm just going to use this one thread for all my issues. Current issue: I don't get a certain type of...

I just bought a brand new TI89 and the second I turn it on I go to Home. I press F1 to go to tools and the Open and New functions are fuzzy. It won't allow me to use those functions either. This is happening all over the place as I looked throughout the calculator. Any ideas?

Homework Statement Write a program that approximates the probability that at least two people in a room of 50 people have the same birthday. Run 5,000 trials, count up the number at least two people have the same birthday, and divide by the number of trials to get a probability. Homework...

i have reacted zno2 wth Dodecyl benezene sulphonic acid and aniline for the incorporation of zno2 in the matrix of polyaniline.after xrd i m nt getting the exact peaks of zno2 in my composite..can u tell me why? is it forming any complex or wat? please reply soon its urgent Thanks

There is a problem in Avant when getting the web page for gmail. The layout is screwed up. A similar problem holds for National Geographic. Avant forum responses for fixing either don't work or are too obscure to interpret. Has anyone found the correct fix??

Homework Statement I need to be able to get a equation to figure out the initial speed as an object leaves the origin, and I don't understand what exactly I am suppose to treat these as? Basically they are showing us vectors, Vo being velocity vector, and Vox and Voy being x and y components...

I'm having issues with overheating and need a little help. I have 8 6v4ah rechargeable lead-acid batteries. I wire 2 in series for 12 volts. Then i wire the sets of 2 in parallel, because I want to keep my system at 12 volts. That means I have 16 amps. Every time I add more sets of...

HI! I am actually working on a project involving Acoustic Modem. However, we met up with some problems. We actually took the acoustic modem from another item. Thus there might have been some programming done to the modem which we do not know. The acoustic modem will work when its...

hi i wrote the following code. i think it's fairly easy to understand what I am trying to get it to print. but LaTeX really doesn't like it. any advice? \documentclass[12pt]{report} \usepackage{float} \usepackage{multirow} \usepackage{graphicx} \usepackage{subfigure}...

I've noticed that several of us, if not many of us, are flyers, including one of the admins. I'd like to propose a thread to discuss current aviation mishaps, or at least ones which recently occurred. It's not a place to dig up old accidents, other than as they're related to current/recent...

I must be doing something wrong. Every time I try to post some Latex it never shows up; I always get the 'broken image' image. \alpha\beta\gamma\delta [ EDITED to work correctly ] Even if I get the syntax wrong, it should still show up, right? That doesn't cause an error. Am I not...

This is a follow on from a previous thread about issues I had with regular Eddington-Finkelstein coordinates. First I show a brief derivation of the advanced EF coordinates which appears to have less issues than the regular EF coordinates and then discuss what I think appear to be the remaining...

Hi, Eddington-Finkelstein coordinates claim to prove that photons can only travel in one direction, towards the central singularity, below the event horizon. My intention here is to put EF coordinates under the microscope and see how that proof stands up to close examination. The Eddington...

Homework Statement 1.a) the velocity components of a 3-d flow are u= \frac{ax}{x^2+y^2} v= \frac{ay}{x^2+y^2} \omega = c where a and c are arbitrary constants . show that the streamlines of this flow are helics x=acos(t) ; y=asin(t) ; x=a*c*t a. what is the...

Homework Statement specific volume of steel = 489 lb/ft^3 http://ultraxs.com/image-5D1E_4AFD177E.jpg Homework Equations I tried using Ixo=1/4mr2+1/12ml2+md2 The Attempt at a Solution I tried using d=70mm because of the parallel axis therm, but that was wrong. my... r=110mm...

First of all, I'm not an electrical engineer. I'm just a software developer who has written an application to do push-to-talk over wireless LANs on Windows Mobile devices, mostly for warehouse environments. We've got a prospect right now who wants to run our software on some forklift terminals...

I am having some trouble with the Java Scanner to read input from the keyboard. I am trying to keep my input cleaned up and secure, so I am checking for the right type and value, and clearing the input buffer if it isn't. I also restart the prompt loop if it isn't right, so they can try again...

Homework Statement PV = PMT *1-(1+i)^-n / i PV = 225 * 1- (1+.0055)^-42 / .005 PV = 8417.37 How did they get this. how do you use a negative exponent on a scientific calculator. Homework Equations The Attempt at a Solution