## Search found 4357 matches

Tue Apr 28, 2009 8:27 pm UTC
Forum: Mathematics
Topic: Good problem for a 10th grader?
Replies: 32
Views: 2077

### Re: Good problem for a 10th grader?

Office_Shredder wrote:prove the sum of three consecutive odd numbers is only divisible by 4 if the first one isn't

I suspect that this should read "even numbers" rather than odd...
Tue Apr 28, 2009 7:29 pm UTC
Forum: Science
Topic: M-Theory
Replies: 5
Views: 618

### Re: M-Theory

I'm not sure it is fair to say that M-theory/String theory do resolve the fundamental incompatabilities between QM and GR, even mathematically. The goal of those theories is to explain the underlying incompatabilities, but to date, as far as I know, they haven't succeeded by any stretch of the imagi...
Tue Apr 28, 2009 5:55 pm UTC
Forum: Mathematics
Topic: Residue Calculus Problem
Replies: 16
Views: 1770

### Re: Residue Calculus Problem

I'm working on the final review assignment for this same course and I'm trying to figure out what my prof did in the following steps: Find the residue at z=0 of f(z)=\frac{1}{z^2\sinh{z}} Solution: Since \sinh{z}=z+\frac{z^3}{3!}+\frac{z^5}{5!}+\cdots it follows that \frac{1}{z^2\sinh{z}}=\...
Tue Apr 28, 2009 5:29 pm UTC
Forum: Mathematics
Topic: Good problem for a 10th grader?
Replies: 32
Views: 2077

### Re: Good problem for a 10th grader?

Here's a few that I've come across that are kind of fun. I don't know if these are an appropriate difficulty level for the student you're dealing with though. Suppose we have a 7x7 chess board, and every square on the chess board has a knight on it. Now suppose all of these knight simultaneously per...
Tue Apr 28, 2009 2:46 am UTC
Topic: Can we have peace?
Replies: 69
Views: 10657

### Re: Can we have peace?

I don't really think of African countries as having fought any real wars, other than civil ones. If Congo though decied to rip through and conquer its neighbours, I bet it'd end up better off whether they ultimately won anything or not. I'm assuming here you're ignoring the Second Congo War , the l...
Wed Apr 22, 2009 9:26 pm UTC
Topic: Can we have peace?
Replies: 69
Views: 10657

### Re: Can we have peace?

Well, I think the United States is an interesting counter-example to your argument. The US is arguably the richest, most heavily industrialized country in the world, featuring a relatively functional republic, and an arguably fairly content populace. By your arguments, then, the United States probab...
Mon Apr 20, 2009 9:54 pm UTC
Forum: School
Topic: Scholarship Essays
Replies: 9
Views: 1167

### Re: Scholarship Essays

Okay, first off, it doesn't matter what example you use, specifically, as long as it is reasonably topically relevant. What is much, much more important is that you write exactly to the question that they're asking. Make sure you know and understand the criteria that they are using to judge the essa...
Wed Apr 15, 2009 12:57 am UTC
Forum: School
Topic: Class rank?
Replies: 113
Views: 8699

### Re: Class rank?

I'm shocked that schools would actually make this information available. There doesn't really seem to be any point to it, and a lot of harm to be done by it.
Wed Apr 15, 2009 12:52 am UTC
Forum: Science
Topic: Negative Mass?
Replies: 45
Views: 3801

### Re: Negative Mass?

It would spontaneously accelerate from rest (in violation of the law of inertia) It would spontaneously decelerate if in motion (same reason) No, it wouldn't mean this at all. If an object had negative mass, and you pushed it, then it would move toward you. The acceleration would be in the opposite...
Wed Mar 18, 2009 4:57 am UTC
Topic: Initiating Change to Prevent Climate Change
Replies: 11
Views: 1089

### Re: Initiating Change to Prevent Climate Change

@LaserGuy You raised alot of valid points, which I can and normally would respond to, but I would really like to keep this thread on-topic. The question that is being asked, is, "How can governments be convinced or persuaded to take meaningful action to reduce action, or rather, what is requir...
Tue Mar 17, 2009 8:45 pm UTC
Topic: Initiating Change to Prevent Climate Change
Replies: 11
Views: 1089

### Re: Initiating Change to Prevent Climate Change

Science has pretty much wrapped that climate change is bad and that its in our best interest to do someting about it, well, actually suggest doing something about it 20 years ago, well, you can find warnings that date further back than that too. All in all, as time goes on, scientific understanding...
Wed Mar 11, 2009 10:35 pm UTC
Forum: Mathematics
Topic: Fair multiple choice test
Replies: 11
Views: 1488

### Re: Fair multiple choice test

If you have to do a multiple choice test, I think Xanthir's solution is the most fair. If a student isn't sure about the question, they're better off not answering rather than guessing. On the other hand, the BEST solution would be not to use a multiple choice test. Multiple choice is basically usel...
Sun Mar 08, 2009 10:42 pm UTC
Topic: Responsibility
Replies: 40
Views: 3687

### Re: Responsibility

This has been troubling me for quite a while. I think that the notion of having a justice system that assigns responsibility for crimes to people is rather simplistic an inaccurate. Let's take things from the beginning: In our society, events happen that can be perceived as errors or wrong. For exa...
Sun Mar 08, 2009 1:53 pm UTC
Forum: Science
Topic: Mass and Energy remain constant in how many dimensions?
Replies: 16
Views: 1608

### Re: Mass and Energy remain constant in how many dimensions?

because objects over time tend to come to rest, yet average will always be >0. Why, Hello ancient Greek man. :) I thought "objects over time tend to come to rest" has been disproven since Galileo...o.O Mass will decay into radiation, and when there is no mass, you can easily prove that a ...
Sun Mar 08, 2009 5:47 am UTC
Forum: School
Topic: Need further reading suggestions (Nat. Sci.) for Cambridge
Replies: 12
Views: 1285

### Re: Need further reading suggestions (Nat. Sci.) for Cambridge

Amazon and Chapters carry pretty much all standard (English) university texts in science. If there happens to be a university or community college in your neighbourhood, they may have a bookstore that you can use, or, better yet, use the library facilities. MITOpenCourseWare (google it!) has a selec...
Thu Mar 05, 2009 9:58 pm UTC
Forum: School
Replies: 61
Views: 5645

### Re: Debate: Grades VS Knowledge

The system that I've taken a liking to is one called Mastery-based education.... I really like this system, but there are some problems that make it difficult. First, I dont think teachers would be able to handle it. They wouldnt be able to keep track of mutiple studendts at potentially different p...
Thu Mar 05, 2009 9:24 pm UTC
Forum: Science
Topic: Electronegativity
Replies: 7
Views: 612

### Re: Electronegativity

Okay, I'll give this a shot. Be warned that this is a grotesque oversimplification of the problem... The nucleus of the atom is made up of positively charged protons. Let's say each proton has a charge of +1. Surrounding the nucleus is a cloud of electrons, each with charge -1. So as long as an atom...
Thu Mar 05, 2009 6:10 am UTC
Forum: School
Replies: 61
Views: 5645

### Re: Debate: Grades VS Knowledge

This is a complicated question. I'll try to break things down a bit as I see it: Assessment is an absolutely necessary component in learning. Students need to be given a metric that shows them their progress and how well they grasp a particular concept. This does not have to be a numerical score or ...
Thu Mar 05, 2009 1:05 am UTC
Forum: School
Topic: Free stories? theres no such thing!
Replies: 23
Views: 1935

### Re: Free stories? theres no such thing!

I rather disagree with number 3. This is a short story, not a novel. Many short stories imply flat and stock characters. Even the main protagonist is often flat and the story focuses more on the location and narrative than the characters. I really don't think a few pages of backstory are going to b...
Wed Mar 04, 2009 11:46 pm UTC
Forum: School
Topic: Free stories? theres no such thing!
Replies: 23
Views: 1935

### Re: Free stories? theres no such thing!

Okay, I will put this simply: you need something more to go off of than just an idea of choice. Choice can be a *theme* of your story, and could be a very interesting one, but right now you have more of development concept than a theme. That is, you can write a story about choices, and their consequ...
Wed Mar 04, 2009 7:05 am UTC
Forum: Science
Topic: Infinite Grid of Springs
Replies: 14
Views: 1934

### Re: Infinite Grid of Springs

There are two approaches that you can take to solve this problem: 1) Go continuous... on a large enough scale, you can treat this as vibrations in a 2-d infinite plane. This can be solved using the wave equation and fourier transforms. Or probabably conformal mapping, if you prefer complex analysis....
Tue Feb 24, 2009 11:34 pm UTC
Topic: Left vs. Right?
Replies: 57
Views: 6247

### Re: Left vs. Right?

George Lakoff just posted an article at Daily Kos and 538 . I think it's got some good insight into this issue. Here's what I think are the money paragraphs: Conservatives tend to think in terms of direct causation. The overwhelming moral value of individual, not social, responsibility requires tha...
Thu Feb 05, 2009 8:41 pm UTC
Forum: School
Replies: 6
Views: 1157

Regardless of whether or not you get a letter of reference, I would suggest that you start networking with the profs in your faculty. Your prof probably has office hours once or twice a week from your class, and, from what I've seen, these rarely get used by undergrads until they're late in their de...
Thu Feb 05, 2009 8:17 pm UTC
Forum: Science
Topic: Do particles ever touch?
Replies: 42
Views: 3694

### Re: Do particles ever touch?

If I have two atoms and they combine into a molecule, do they ever really *touch*. I know they are bound together by electromagnetism and certain molecules will bind in a stronger fashion, but do the particles ever make contact. I know it's possible, during fusion or in a particle accelerator, but ...
Sun Feb 01, 2009 1:04 am UTC
Forum: School
Topic: Does college look at what classes you take in HS?
Replies: 14
Views: 1881

### Re: Does college look at what classes you take in HS?

Hi, I am a freshman in High School. I am taking Geometry I Honors, English II Honors, Global Studies I Honors, Chorus, Integrated Business Apps (an easy class about Microsoft Office), my one PE class needed to graduate, and have credits for Biology I Honors and Algebra I Honors. I plan on taking a ...
Thu Jan 29, 2009 9:36 pm UTC
Topic: Slurs
Replies: 391
Views: 34385

### Re: Slurs

But something may be queer (strange or odd from a conventional viewpoint; unusually different; singular) without any connotation. ...Yes, and 'gay' can also mean 'happy', and 'faggot' can also mean 'bundle of sticks'. All perfectly legitimate uses for those words. But it's generally pretty easy to ...
Thu Jan 29, 2009 8:26 pm UTC
Topic: Helping the poor pay for college
Replies: 106
Views: 9509

### Re: Helping the poor pay for college

Azrael, the thing is, a more educated society tends to do much better economically - in other words, we, as a nation, receive a return on investment from education that we pay for that is astronomical, as far as ROI goes. As weird as it feels to say this, I don't feel that we should assume this pro...
Tue Jan 27, 2009 5:47 pm UTC
Forum: Science
Topic: My First Question (Light and Time)
Replies: 9
Views: 1040

### Re: My First Question

My first question is about light. I know that I shouldn't ask simple stuff such as the speed at which light travels, but what I want to know is the relationship that light shares with time. I remember reading that the closer you get to the speed of light the slower you move through the dimension of...
Tue Jan 27, 2009 5:08 pm UTC
Topic: The least racist country?
Replies: 107
Views: 14438

### Re: The least racist country?

Also Canada's head of state has been a minority since 1999. Hell, the current head of state is an immigrant. Perhaps I live in ignorance of the finer working of Canadian government, but isn't Stephen Harper, a native Canadian and about as white as they come, the head of the country? Actually, Canad...
Fri Jan 23, 2009 9:08 pm UTC
Forum: Science
Topic: Well, I'm a noob here, hoping to learn about physics. . .
Replies: 21
Views: 1780

### Re: Well, I'm a noob here, hoping to learn about physics. . .

Have you read "A Brief History of Nearly Everything" by Bill Brison?
Thu Jan 22, 2009 10:39 pm UTC
Topic: Slurs
Replies: 391
Views: 34385

### Re: Slurs

Is it my responsibility to purge my language of every possible word/phrase/expression that someone could construe as offensive? Or it is the responsibility of others to realise that clearly context of the text was not intended to be offensive? Don't think of it in terms of offense. The problem is n...
Thu Jan 22, 2009 9:59 pm UTC
Topic: Slurs
Replies: 391
Views: 34385

### Re: Slurs

Or you could say: "The driver should fasten THEIR seatbeat before THEY start the engine." In english the male pronoun is not neutral and does not designate women as well. If you wanted to do it biologically, since female is where everyone starts--you'd think to be consistent we should be ...
Thu Jan 22, 2009 8:39 pm UTC
Topic: Slurs
Replies: 391
Views: 34385

### Re: Slurs

Trying to jump in here to deal with some of the relavent recent discussion... Mods feel free to stop me if I go too far afield. It bugs me considerably whenever peoble use gender-specific insults or misogynic language in my presence, and every single time I'll be given "you know I'm not serious...
Thu Jan 22, 2009 4:28 pm UTC
Forum: School
Topic: Has College Been Glorified?
Replies: 34
Views: 3306

### Re: Has College Been Glorified?

I see college (or university in my case) as the savior. I dislike school quite a lot at the moment, and I never feel like doing anything. I've always done all the assignments, tests and homeworks and never missed a deadline, until last week. No big deal, my teacher just said I'd hand it in next Fri...
Thu Jan 15, 2009 9:18 pm UTC
Forum: Science
Topic: Convincing People that the Earth is Flat
Replies: 11
Views: 2474

### Re: Convincing People that the Earth is Flat

Taking Tass' argument a bit further, I think you can get rid of the problem of not having sunrise/sunset in the planar model to some extent by postulating the existence of a negative gravitational charge on light. Assuming my back of the envelope ray diagrams are right, this make distant objects app...
Thu Jan 15, 2009 7:13 pm UTC
Forum: Science
Topic: Convincing People that the Earth is Flat
Replies: 11
Views: 2474

### Re: Convincing People that the Earth is Flat

Ok, I'll give this a shot: Assume that the Earth is an infinite plane that has periodic features over distances of ~40000km in any direction in every possible way. Then everything on the Earth can be specified by a coordinate (x + n*40000, y + n*40000). That is, there are multiple copies of you that...
Thu Jan 15, 2009 6:21 pm UTC
Forum: School
Topic: Standardized tests... thoughts, opinions, ideas?
Replies: 46
Views: 3933

### Re: Standardized tests... thoughts, opinions, ideas?

I'm going to disagree with the general sentiment here and state that I feel that under the present academic climate, standardized testing is a necessary, if ill-used, tool. The stated purpose of most (if not all) standardized tests is to provide bodies with the interest (universities, governments, e...