Multiple Definition and 1000 Threads

Homework Statement To find the voltage at the 5 ohms resistor. Homework Equations V=IR Kirchoff's first and second law The Attempt at a Solution The attempt was simply too long I ended up with a voltage of 6.5V on the 5 ohm resistor... Please help me, I have been stuck in this...

Homework Statement I'm currently doing some thermodynamic analysis. I don't know where to put this question, but here goes: I have a system that has two streams entering a condenser, and one leaving. I don't know mostly anything about two of the streams. One stream I have fully defined...

I belong to a group of people who, inter alia, (try to) apply Bayesian Theory to miscarriages of justice eg the recent spate of medical staff arrested when rare (but to be expected eventually) clusters of deaths occur in hospitals. A somewhat opposite case has recently arisen which has generated...

I posted this first in the homework section, but no one answered it. I figured this might be a better section... I have multiple 1D data sets, let's call them data1, data2, data3, etc. Each data set has the same number of entries. Each one is either a row or a column (I can just use...

Homework Statement A charged particle traveling with a velocity v in a magnetic field B experiences a force F that must be: A. parallel to v B. perpendicular to only v C. parallel to v-B D. parallel to B E. perpendicular to v x B Homework Equations Requires this right hand...

Homework Statement I have multiple 1D data sets, let's call them data1, data2, data3, etc. Each data set has the same number of entries. Each one is either a row or a column (I can just use Transpose[...], so same] and when I use the ListPlot[] function, I get a graph where the vertical axis...

Newton Law Gravitation - Multiple choice question?? Homework Statement Newton’s law of gravitation can be applied to the Earth-Moon system. Which of the following statements is not correct? A The value of G at the surface of the Moon is the same as that at the surface of the Earth...

Law of multiple proportions states that "if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole numbers" I was thinking how it makes sense. and i concluded this just simply means...

I am looking for the best way to prevent corrosion between two different materials while maintaining electrical contact between them. Specifically, I am wondering about carbon fiber panels placed on an aluminum base and exposed to seawater. Carbon (graphite at least) has a much higher galvanic...

Homework Statement see attached file Homework Equations The Attempt at a Solution ok so I get that the answer is B but is it because they have the same q/m ratio?

Homework Statement Let D be the set of points (x,y) in R^2 for which 0 is ≤ x ≤ 1 and 0 ≤ y ≤ 1. Find a function g: R^2 --> R for which: ∫_0^1 ∫_0^1 h(x,y)dxdy = ∫_0^1∫_0^1 h(y^5, x^3) * g(x,y)dxdy is true for all functions h: D--> R integrable over D In the question before this I...

I've been trying to figure out how to solve the following problem: "A metal bar is placed in a container (call it container A) which is inside of a much larger container (call it container B), whose temperature can be assumed to be constant. Find the function for the temperature of the metal...

Homework Statement I am currently taking calc III and we have starting getting into double and triple integrals. I was wondering what you are actually doing when you take a double or triple integral? And what the difference is. I understand that you find area with a single integral and find...

Homework Statement If you step up the voltage in a wire by a factor of 100, how is heat affected? A. No change B. Heat loss increases by a factor of 10000 C. Heat loss decreases by a factor of 10000 D. Not enough information to tell Answer: "C, heat loss decreases by a factor of 10000...

5. A force of 12 N is applied tangentially to the rim of a wheel with radius 0.70 m and rotational inertia 3.0 kg-m2. What angular acceleration results? a) 2.6 rad/s2 b) 2.8 rad/s2 c) 3.2 rad/s2 d) 3.4 rad/s2 e) none of these ____6. If the force in question #5 acts for 20 s, what will be the...

I need to find an equation to figure out the breakdown voltage of layers of materials. In my case it will be air then glass then an inert gas. Any one have any info on how to get this. Thanks.

Multiple Pulleys and Masses with Friction (Picture Included) Homework Statement http://content.screencast.com/users/Waraa/folders/Snagit/media/2d699ba1-32e0-4d9c-b79f-1a1d85dccd12/03.19.2012-15.49.46.png I have solved the question but I am still iffy as to whether my solution is correct...

Hi guys! I think I need to explain myself before I ask for the advice :) I'm 27 (so been in grade 12 ages ago) - I didn't have science, I wrote it years later. Now I'm enrolled for a Bsc degree in the hope of getting into medical school (very tough in South Africa). I'm putting a lot of time...

I have tried solving for the exciton energy in GaAs/AlAs QWs but my calculated results do not agree with published experimental results. My model in the calculation is just a single GaAs well with AlAs barriers. Using the material parameters of both materials, and the well width, I calculated...

I already asked this question on physics.stackexchange.com, but did not get the desired response. I am interested in the opinion of your community. Picture an entangled pair of spin 1/2-spin particles with total spin 0. In the diagram, particle 1 of the pair is moving to the left (-y), and...

any one universe is infinite. So as there are multiple (parallel right?) universes, how do multiple infinities co exist? Lets say, even conceptually or mathematically? If not parallel, then again, what happens after completion of 10^500 universes?

I need to apply D'Lembert's method but in this case I don't know how. How to proceed? Determine the solution of the wave equation on a semi-infinite interval $u_{tt}=c^2u_{xx},$ $0<x<\infty,$ $t>0,$ where $u(0,t)=0$ and the initial conditions: $\begin{aligned} & u(x,0)=\left\{ \begin{align}...

Homework Statement Find the volume of the given solid. Under the plane x − 2y + z = 8 and above the region bounded by x + y = 1 and x2 + y = 1 The Attempt at a Solution Here's how I set it up. \int^1_0 \int^{1-x^2}_{1-x} (8-x+2y) dydx When I do the math, I get 21/20. I have...

Suppose I know that the diastolic blood pressure of my 30 patients is normally distributed with the same mean and standard deviation. Then the odds of one patient having a diastolic blood pressure is x higher than the others is the probability that the observed value of a normally distributed...

Series and parallel circuit with multiple resistors?? Homework Statement If R1 = 27Ω and R2 = 7Ω : a. What is the equivalent resistance of the circuit? b. What is the current from the battery? c. What is the voltage drop across the R1 resistor? Homework Equations I=V/R ΔV=-IR...

Gentlemen, I have a subform with the following fields: name of the step, the scheduled date, place and date rescheduled date. I'm having trouble making a statement in a query that has the following criteria: need to know what the step is smaller than today's date between the date scheduled...

I have a bunch of photodiodes and I want to interface to these to a computer using my sound card. I have 12 sensors and stereo input samples at around 96000hz. My idea is to connect 12 sensors to each line and have them turn on or off at a specified offset so that the total output signal would...

Homework Statement Hello everyone. My task is to find the largest positive root in a specific interval of a function using the bisection method, Newton-Raphson method, and secant method. I've written code for all three of these methods, but the only way I can find all of the roots is to hard...

On the subject of gravitational lensing there seems to be two rather different phenomena. The "arc" phenomena seems rather plausible to me, if light is affected by gravity which is natural then there should be able to get that kind of behaviour. But the multiple imaging stuff, seems rather...

Homework Statement Hello everyone. My task is to find the largest positive root in a specific interval of a function using the bisection method, Newton-Raphson method, and secant method. I've written code for all three of these methods, but the only way I can find all of the roots is to hard...

Homework Statement The circuit used in this problem is attached as an image. I made this in gEDA (the circuit is from the homework problem, I just didn't feel like using a scanner to get the image) The 2-microfarad capacitor shown in the circuit attached is fully charged by closing switch...

What are the products of electrolysis of brine solution? At cathode i know it will be hydrogen But i am confused about the products at anode:- Either water will get oxidised or chlorine. Considering the oxidation potential values - water should get converted to oxygen but practically...

Homework Statement Ok, so I am going to French University, I have to translate in English. There is a hemisphere with the radius of 2. Inside of it, there is an empty space shaped as a cylinder with the radius (a< 2) which is perpendicular to the base of the hemisphere. The density of...

I come across questions where I have to match the equation with its contour map and graph. Examples: z = sin(xy) z = sin(x-y) Right now I'm using Wolfram Alpha for all of these, but supposing these appear on an exam... how do I graph it by hand? :confused: For example, for z =...

If I have two strings of equalities within the same align or alignat environment, and the first one is long enough to need two lines, I would want the result to look like A+B+C=D=E =F=G=H I=J rather than A+B+C=D=E =F=G=H I=J Is there a way to do this? I suppose it can be done...

Hello, I am in the process of designing a voice activate control system for my truck for various things like wiper motors/windows/etc. The development board I am using will have up to 20 outputs @ either 5 or 12V DC around 10mA. However, this is not strong enough to drive a wiper motor or...

I need help with all of these. I am so lost on all of them and have been working for hours. Anything is so appreciated. _____1. A rock is dropped off a cliff and falls the first half of the distance to the ground in t1 seconds. It falls the second half of the distance in t2 seconds. What...

Homework Statement Suppose f(x) is a piecewise function defined as follows f(x) = 2x^2+2 ---- > x < 1 = 2x^2 - 3x ----- > 1 ≤ x ≤ 2 = 2 - (6/x) ----- > x > 2 Graph f(x) for 0 ≤ x ≤ 3Find the left and right hand limits of f(x) as x approaches 1 and as x approaches...

It's been a long time since I've done (least squares?) multiple regression, is the calculation below correct? y data points 6,054 7,200 6,243 5,536 4,879 y hat = 5,984 x data points 414 351 425 372 328 x hat = 378 Sum of xy's residuals = 39,643 Sum of (x-x hat) squared =...

A 4.0 N and 3.0 N force act simultaneously on a circular mass of .25 kg, initially at rest floating in space. a) Find the net force acting on the mass (magnitude and direction) I found the netforce (Resultant) = 5N b) Find the acceleration of the mass, magnitude and direction. The...

hallo I am trying to calculate the probability to obtain 2 sets of linearly independent vectors from a set of binary vectors of length k. For example: k = 4, and therefore I have 2^k = 16 vectors to select from. I want to randomly select 7 vectors (no repetition). What is the...

Homework Statement This is more of a concept question rather than a HW problem, but I have two Circuits shown in the image attached. I am not really understanding how a short would affect resistance in these cases. 2. The attempt at a solution For figure 1 I am considering one of two...

Why can't there be a metal-metal multiple bond in ... ? [Re2OCl10] 4- Each Re has an octahedral geometry basically, with 5 Cl- attached to it. It also has a bridging O, which bridges the two Re together. O also produces pi donation to each Re, so that there is basically a double bond...

Homework Statement I can't understand what's causing this bug. I'm not trying to actually use this program, but it's just something I made up to learn how it works, and understand why things don't work, while I'm learning C++. So my question is, what's causing this program to get this error...

Homework Statement I'm not sure where to begin with this problem A car is traveling West at 35mph. 45 feet in front of this car is an intersection , and another car is about to turn in front of the westbound car. Could the car safely complete the left hand turn , or would the westbound car...

Here's a slight brainteaser for you all ! Seems simple at sight but can be harder than you think :D P.S I'm working on it as of now, it's an interesting question. Solve : 1/(√x+√(x+2))+1/(√x+√(x-2))=1/4

I am having a problem coming up with an empirical formula for multiple objects moving with the same speed relative to each one up. I.e. there is a cart moving with speed u relative to me, and inside it is a cart moving speed u relative to the cart is inside it. and inside that cart is a cart...

So I've seen quite a variety of notations that deviate from what we've learned in our "normal" math courses. In math classes we write a volume integral as: \iiint_W \rho\, d V but somehow once we start doing E&M and QM, professors often just drop the extra integral signs: \int_W \rho\, d V...

And by calculated I mean calculated in a fairly simple way. Single reactant problems have the integrated rate laws that relate time, final concentration, and initial concentration. However, I can't seem to find anything on calculating concentration at time t in a reaction with multiple...

Hi all I am using some code that was originally written in F77, but as it is many thousands of lines long, I haven't the time to go changing it. There is one section of code that refuses to work, but I'm assuming it must have at some point since the code has been used in the past...