Example Definition and 879 Threads

there's an example problem in my textbook, but I'm stuck on how to make the first move~ "a tank contains 1000gal of water in which 200lb of salt are dissolved. Fifty gallonw of brine, each containing (1+cost)lb of dissolbed salt, run into the tank per minute. The mixture, kept uniform by...

I want to know some examples of an infinite set S with a least upper bound that is not an accumulation point of S. Is this an example... (-oo, 10]?

Hi All, I think most of you are acquainted with that logical question concerning two guards, one of them always says lies while the other always says the truth. Each one of these guards stands in front of one door...one of these two doors is the door of GOOD and the other, the door of EVIL...

Find the numbers M and N such that: 5+4x -x^2 = m - (x - n)^2 for all real values of x. If someone could work this out, Then ill show my workings and ask questions (its to do with the arrangements of N^2 after expanding brackets mainly. Thanks in advanced, ASMATHSHELPME

This from cnn today: http://www.cnn.com/2005/WORLD/meast/07/25/military.release/index.html

is it possible to think without a language? Helen Keller knew nothing about language until the age of 16 when she began to speak. To any deaf and mute person, language would not be a medium of thought, or would it? My Father says he thinks in pictures, but to me that in a way makes no sense...

Hi there, I was looking at a problem, where the state (a pure state) of a two-particle system was given as: | \Psi> = A_{11}| a_1 b_1 > + A_{12} | a_1 b_2> + A_{21} | a_2 b_1> + A_{22} | a_2 b_2> In the system particle a can only be in the states a_1 or a_2 and particle b in b_1 or...

Is Frame Dragging an Example of a Gravity Wave?

Looking at the Friedman solution for a fluid with a given pressure and energy density, we have: H^2 = \left(\frac{\dot{a}}{a}\right)^2 = \frac{8 \pi G}{3}\rho + \frac{\Lambda}{3} - \frac{k}{a^2} Would someone mind walking me through how we arrive at a? Rev Prez

Is this possible? I have been struggling with the following question, which is an assignment from my physics professor. Any help would be wonderful, thank you... Is it possible to have a naturally occurring situation where an object/element/particle is being acted upon by only a single...

I do not here state that srt or it's applications would be wrong but simply I wish to bring out a faulty example. In the text box I carried about a year ago, the following "thought-experiment" and example were brought to support the mass-energy equivalence: --- Einstein's gedanken, the lamp...

I tried every which way, but am getting a wrong answer for the Thevenin equivalent voltage in the following circuit. I tried Norton too, but got a different answer and neither of them matches the correct answer from the book. Please help me :redface: ... I'm too frustrated :( Here's the...

I'm confused from one step to the next in the book. In the first step, they have (n+1)! then in the next step the write that as (n+1)n! so (n+1)! = (n+1)n! ? I don't understand that, can someone explain it to me ? ( I am very unfamiliar with factorials, this is like some...

i always hear the same examples; antibiotics resistance of bacteria, ddt , anemia examples…. These are all invalid. Just please tell me one valid example of beneficial mutation if there is. Also backup your example please. By the way i suggest you to check this before you write...

You're asked to find lim x-->0 sin7x / 4x The part of this example that I don't understand the most is how they get 1 out of sin7x/7x when x-->0. Sorry about the ridiculously small image. The dimension restrictions are ridiculous, and I didn't notice that the image didn't attach properly...

I was asked to find a function that is continuous nowhere but its square is continuous everywhere but 0. The domain of the function is [0,1]. I can't come up with an example... Any help is appreaciated. Thanks

What specific physics best represents a comprehensive introduction to the overall subject? For instance, Richard Feynman used to say that the two-slit experiment was most basic for knowing quantum mechanics.

Does anyone know an example of a reaction which produces gas?

Hi, Could anybody describe a procedure for splitting a matrix using a choleski method? Could anyone show this on a simple example: Let's say we have a matrix A: [2 1 0 0] [1 2 1 0] [0 1 2 1] [0 0 1 2] and matrix b: [1] [0] [0] [1] How to get x: Ax = b using abovementioned method?

I know for a fact that \int \frac{(du)}{(a^2 + u^2)} = \frac{1}{a} \cdot arctan \frac{u}{a} + C I was given the problem of solving the indefinite integral of \int \frac{(dx)}{(2x^2 + 2x + 5)} First, I multiplied the integral by (1/2) / (1/2) to eliminate the coefficient of...

In the statement P -> Q , Q is necessary for P. I just don't get it ,why don't we say P is necessary for Q, can you illustrate it in an example ? :redface:

Self Adjoint very nicely gave me an example when QM doesn't work with GR using something called Spinors which define quantum mechanical particles. i was wondering how exactly is spinors pronounced Is it like spinners umm like the rims lol :) ? Sorry for the odd question, I just don't...

Questoin...I have allways done these by evaluating (F 0f G)(x) ...then finding the domain of G and then useing a graphing calculator to find the domain of the whole thing as a function. My question is how do you algebracially fine the domain of the function after you find the domain of G int the...

Hi, I've to cope a little problem concerning general nonlinear regression. To cut a long story short: I've got a very complicated function y=f(a,x), and a lot of measured values for x and y. The goal is to fit the free parameter a. Therefor, I wrote a simple c++ program that calculates the...

Help with one of those "how much solution to equal a percentage of acid" problems! undefinedundefinedundefined My problem seems to be in just how to set up the table. Once I get the figures plugged in, I can seem to work the problem. The question asks: Minoxidil is a drug that has...

hey guys, i failed calc last year and got a bad grade in physics. But i still want to learn about both. My question is about deratives. I have yet to find a real world example and how to apply the formulas to it. I've hurd that the curvature (dunno if that's a word) of on/off freeway ramps...

hi...my teacher has offered an optional project of creating something that used Newton's third law.. I've been trying to think of something but i don't have any ideas... i have to make something .. and umm it can't be a fan on wheel blowing against a wall because that's the example in the book...

http://www.cnn.com/2003/TECH/scienc...n.ap/index.html I think this provides a good example of how genetic codes can be altered to produce dramatic changes in a species. Much in the same way that cabbage, kale, broccoli, cauliflower, and Brussels sprouts all were derived (evolved) from a...

Could someone please show me a very easy agebraic example of U-Substitution?