# Search results

1. ### Irreducibility and finite fields

yeah you're completely right and i noticed my mistake right after i posted that. i overlooked the whole extended element thing. my bad.
2. ### Irreducibility and finite fields

For part i: Because this is a finite field, you must show that the polynomial g(X) has no roots in k. Because k is a finite field of 2 elements, you can just try plugging in 0 and 1 because k = {0,1}. So g(X) is irreducible if and only if 0^2-T is not equal to zero and 1^2-T is not equal...
3. ### How to find limit of arithmetic series?

the above poster didn't say it, so i will because it just helped me while doing my calculus homework here: thanks
4. ### Sciam Partnership: Member Discount!

So when I ask for my subscription, how exactly do I let them know that I am a PF member so that I can get the great discount?
5. ### College Physics 1 - Composition of Forces

its very rare around here that i get to help out, so here i go: http://img144.imageshack.us/img144/830/39461219yw3.png [Broken] as for the law of sines bit, your formula in there is 100% right, but for the real answer you wanna use the new number you get from plugging in whatever i just gave...
6. ### Inclined plane question

THAT'S the reason! Thank you, that completely did not occur to me. I understand now, thanks.
7. ### Inclined plane question

So I was watching some of those physics videos posted in schoolwork board, and although he probably didn't make an error here, I don't think I understand it. Here's the pictues. I'll elaborate after it so you guys know what I'm talking about...
8. ### Work energy problem

I understand — thanks. If I get stuck anywhere else I'll be sure to make a new thread. Thanks for your help everybody.
9. ### Work energy problem

So anything at all can do work? And in this case, the friction does the work because it forces an object to slow over a certain distance, meanwhile the object just relaxes while the friction does all of the work for it?
10. ### Work energy problem

I'm not insulted, it's alright. I took physics in high school, and now I'm trying to learn it with calculus, now that I've completed the class. Somehow I got the impression that plug-and-chug is not how you're supposed to do this stuff when calculus is brought into the equation. Maybe I'm...
11. ### Work energy problem

Since I'm trying to figure this out, allow me to type what I'm thinking here... hopefully you guys could point out where I'm going wrong: So since friction has absorbed the energy that was being used to move the block, my goal is to figure out the distance covered by whatever work the friction...
12. ### Work energy problem

Homework Statement A 30.0 kg box sliding at 5.00 m/s on a rough surface is brought to rest by 20.0 N of friction. What distance does the box slide? Homework Equations KE = 1/2*m*(v^2-v^2) The Attempt at a Solution I know that the change in velocity is 5.00 m/s since it is going to...
13. ### Find the equation from a graph

edited out my answer because i wasn't aware of this rule. way to botch the first post in the forum, eh? well, to be more helpful without giving an answer: when you're looking at a graph, it really is rather simple... that purple one sure looks pretty basic, don't ya think? pay attention to...