## Search found 31 matches

- Thu Mar 24, 2011 2:46 am UTC
- Forum: Science
- Topic: Homework help-> Dynamics question
- Replies:
**1** - Views:
**474**

### Re: Homework help-> Dynamics question

Got it, sorry for any troubles!

- Wed Mar 23, 2011 10:21 pm UTC
- Forum: Science
- Topic: Homework help-> Dynamics question
- Replies:
**1** - Views:
**474**

### Homework help-> Dynamics question

Hello, I have one last question on my dynamics homework and I'll be done for the evening. I feel as though I am making a stupid error, and that my work up to this point may be wrong, so if anyone can lend a hand I would appreciate it. I found the density and calculated the mass to be 317.71 kgs. But...

- Tue Nov 02, 2010 2:06 am UTC
- Forum: Science
- Topic: AP Physics problem-- pulleys (of the frictionless variety)
- Replies:
**16** - Views:
**3531**

### Re: AP Physics problem-- pulleys (of the frictionless variet

I come to the xkcd forums to avoid having my enthusiasm for physics killed by a dry textbook. It's really refreshing to interact with people who enjoy science, and aren't in AP physics juat so they can get in to a better college. Apparently that's too much to ask for? Oh OK, so you just want to int...

- Tue Nov 02, 2010 2:00 am UTC
- Forum: Science
- Topic: Darwinian revolution
- Replies:
**3** - Views:
**601**

### Re: Darwinian revolution

That wasn't necissary. I just needed help brainstorming, I think I have a pretty good one now though. Thanks for the sarcasm.

- Mon Nov 01, 2010 11:20 pm UTC
- Forum: Science
- Topic: Darwinian revolution
- Replies:
**3** - Views:
**601**

### Darwinian revolution

no longer needed, delete please

- Thu Nov 13, 2008 2:15 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0503: "Terminology"
- Replies:
**292** - Views:
**48598**

### Re: Terminology

New zeland and Nova Scotia look more alike.

- Thu Sep 11, 2008 2:09 am UTC
- Forum: Mathematics
- Topic: A simple recursive formula question.
- Replies:
**4** - Views:
**1084**

### A simple recursive formula question.

Hello, in my pre cal class we were doing an assignment on recursive formuli. The series of numbers was pretty simple; {6,3,15,21,51,93 And for this we had to find the formula. The teacher told us that n>2, so the simple answer was t n =2t n-2 +t n-1 However, being the poor student that I am, failed ...

- Sun Feb 17, 2008 10:05 pm UTC
- Forum: Science
- Topic: Decay Series: Essay
- Replies:
**5** - Views:
**1235**

### Re: Decay Series: Essay

Thanks guys. So just so i understand, A half life is a certain period of time. If there are 50 mg of a substance and it has a 20 min half life, after 20 min there is a 50% chance that each of those grams will be gone, (so we interpolate it to be 25 mg left) and each of those atoms that are not left,...

- Sat Feb 16, 2008 5:51 pm UTC
- Forum: Science
- Topic: Decay Series: Essay
- Replies:
**5** - Views:
**1235**

### Decay Series: Essay

Hullo. I've been assigned an essay in my physics 12 course to write about Decay series and sequeneces. Thinking this would be a simple matter of half lives and geometric equations, I was confidant that I would do well in this, but upon doing some research i find it's a bit more complex. I understand...

- Tue Jan 08, 2008 12:58 am UTC
- Forum: Mathematics
- Topic: Factoring a quadratic
- Replies:
**14** - Views:
**1430**

### Re: Factoring a quadratic

Thanks guys. Loads of help as always, hopefully someday i'll be able to repay you in kind.. haha

- Mon Jan 07, 2008 4:52 am UTC
- Forum: Mathematics
- Topic: Factoring a quadratic
- Replies:
**14** - Views:
**1430**

### Re: Factoring a quadratic

ok awesome thanks, i'll just leave a note explaining this to her. I had an idea of how to do this, but wasn't sure at all. Also, (obviously) you were correct about my graphing calculator misleading me with asymptotes.

Cheers, and goodnight.

Pat.

Cheers, and goodnight.

Pat.

- Mon Jan 07, 2008 4:36 am UTC
- Forum: Mathematics
- Topic: Factoring a quadratic
- Replies:
**14** - Views:
**1430**

### Re: Factoring a quadratic

I edited my above post but I don't think you got it... but i dont think my teacher would like it if I said

"well, just put in five or 3.2. It'll work. Trust me" you know? haha

"well, just put in five or 3.2. It'll work. Trust me" you know? haha

- Mon Jan 07, 2008 4:30 am UTC
- Forum: Mathematics
- Topic: Factoring a quadratic
- Replies:
**14** - Views:
**1430**

### Re: Factoring a quadratic

Ok, I understand that the roots are at 5 and 16/5 but i don't quite get how, mathematically, you got there. What happened to the denominator? (number on the bottem, haha, i think its the denominator) Edit: like i get how 5 and 3.2 would work in the equation, but how do i show my work and steps to ge...

- Mon Jan 07, 2008 4:07 am UTC
- Forum: Mathematics
- Topic: Factoring a quadratic
- Replies:
**14** - Views:
**1430**

### Re: Factoring a quadratic

Nope, 2/(x-3)+4/(x-4)=5 .

sorry my fault

sorry my fault

- Mon Jan 07, 2008 3:50 am UTC
- Forum: Mathematics
- Topic: Factoring a quadratic
- Replies:
**14** - Views:
**1430**

### Factoring a quadratic

Hello all, as in par to the rules I must advise you this is a bit of homework of mine. We start out with solve for x 2/(x-3)+4/(x-4)=5, and I've gotten it to ((-5x+16)(x-5))/(x-3)(x-4))=0, and I know from looking at my graphing calc. that it has three, not two roots. I have no idea where to go from ...

- Mon Jan 07, 2008 3:48 am UTC
- Forum: Mathematics
- Topic: A tricky quartic (for me)
- Replies:
**22** - Views:
**2541**

### Re: A tricky quartic (for me)

Thanks guys, this helps a lot. sorry I'm not a very good mathematician-yet-.. haha...

- Thu Jan 03, 2008 7:53 pm UTC
- Forum: Mathematics
- Topic: A tricky quartic (for me)
- Replies:
**22** - Views:
**2541**

### Re: A tricky quartic (for me)

Hey, I understand completley if you don't want to answer, because i know you've all got better things to do than teach me math, but i don't really know what that E type sign is, at all :(. which is why i said i have NO clue how to get that, if you would explain how it works and why it applies here, ...

- Thu Jan 03, 2008 12:58 am UTC
- Forum: Mathematics
- Topic: A tricky quartic (for me)
- Replies:
**22** - Views:
**2541**

### Re: A tricky quartic (for me)

Fixed it, thanks a lot. I really love math but i make stupid mistakes sometimes :X

If x and y are two integers, where y>x,

((y/2)-((x-1)/2))*(x+y)=The sum of all integers from x to y, inclusive.

anyone know that? I have NO clue how to do this

If x and y are two integers, where y>x,

((y/2)-((x-1)/2))*(x+y)=The sum of all integers from x to y, inclusive.

anyone know that? I have NO clue how to do this

- Wed Jan 02, 2008 7:42 pm UTC
- Forum: Mathematics
- Topic: A tricky quartic (for me)
- Replies:
**22** - Views:
**2541**

### Re: A tricky quartic (for me)

Ugh, I'm an idiot. Thank you.

P.s, how would one get the roots of a quartic, preferably without using calculus of some sort, i'm only in grade 12.

P.s, how would one get the roots of a quartic, preferably without using calculus of some sort, i'm only in grade 12.

- Wed Jan 02, 2008 7:33 pm UTC
- Forum: Mathematics
- Topic: A tricky quartic (for me)
- Replies:
**22** - Views:
**2541**

### A tricky quartic (for me)

I have a puzzling question here, and I am not sure how to solve it. I am familiar for factoring for quadratics, but not for quartics.

7a

and i simplified it to

82a

7a

^{2}* 3(4a^{2}- 6) = 14 + 6a^{2}* 42and i simplified it to

82a

^{4}-252a^{2}-32=0, please tell me if i made a mistake and where to go from here.- Sun Dec 16, 2007 12:36 am UTC
- Forum: Mathematics
- Topic: How would you simplify this
- Replies:
**24** - Views:
**2347**

### Re: How would you simplify this

I think by factoring somehow and cancelling. I'm not sure to as exactly how though

Edit: ahh, i have a pretty good idea. Won't say anything till aget the 17th, though.

Edit: ahh, i have a pretty good idea. Won't say anything till aget the 17th, though.

- Sun Dec 16, 2007 12:03 am UTC
- Forum: Mathematics
- Topic: Amusing answers to tests
- Replies:
**393** - Views:
**61990**

### Re: Amusing answers to tests

http://i11.tinypic.com/40nxf83.jpg Out of boredom I did this... please tell me if my answers are correct? :P Well at first we'll have to find the velocity at which the object touches the spring. Let's call its initial position a and the maximum extended position of the spring (just as it touches it...

- Fri Dec 14, 2007 8:09 pm UTC
- Forum: Science
- Topic: Genertically Modified Organisms... Help please.
- Replies:
**18** - Views:
**2260**

### Re: Genertically Modified Organisms... Help please.

http://www.newscientist.com/channel/hea ... ood/dn1841 is an excellent example. thanks for any help you guys can give me.. i just found this one and it's perfect. Now I need a bunch more..

- Fri Dec 14, 2007 7:47 pm UTC
- Forum: Science
- Topic: Genertically Modified Organisms... Help please.
- Replies:
**18** - Views:
**2260**

### Genertically Modified Organisms... Help please.

Hello; I have been having a lot of trouble with my term paper for Biology twelve. I find it difficult to find the things which I need to include in the paper, and with the combination of knowlage and minds here I thought that this would be the best place to try... I need to find five pros and five c...

- Tue Dec 11, 2007 3:04 am UTC
- Forum: Mathematics
- Topic: Logarithm help
- Replies:
**8** - Views:
**1172**

### Re: Logarithm help

If it's not too much to ask, and i understand if I'm being a bother, haha, would you show me how to rewrite it using this problem like you said?

- Mon Dec 10, 2007 7:21 pm UTC
- Forum: Mathematics
- Topic: Logarithm help
- Replies:
**8** - Views:
**1172**

### Re: Logarithm help

Thanks... to be honest i didn't know you could do that.

- Mon Dec 10, 2007 7:05 pm UTC
- Forum: Mathematics
- Topic: Logarithm help
- Replies:
**8** - Views:
**1172**

### Re: Logarithm help

Sorry i made a small mistake, I edited it. one of the equations has an exponent of -3 on the c and the other has 4, how can I multiply them?

I'm probably being really stupid asking this, im sure its really easy for you guys but can the two exponents cancel out somehow and give me a normal c?

I'm probably being really stupid asking this, im sure its really easy for you guys but can the two exponents cancel out somehow and give me a normal c?

- Mon Dec 10, 2007 6:52 pm UTC
- Forum: Mathematics
- Topic: Logarithm help
- Replies:
**8** - Views:
**1172**

### Logarithm help

Hello, I have a log problem which has stumped me. I know that the answer is at the tip of my brain, but I'm not quite sure where to go from here. The question is as follows: if log a b=c 4 and log b a=5/c 3 prove that c = 1/5. I have the left equation to logb/loga=c 4 and the right equation to loga/...

- Sun Dec 02, 2007 5:06 am UTC
- Forum: Mathematics
- Topic: More advanced sinusodial functions.
- Replies:
**3** - Views:
**1269**

### Re: More advanced sinusodial functions.

Right, right. My mistake It's been a while. I thought it had something to do with a linear term added in there somewhere, thanks :P. So could you give me an example of how to graph... say a pendulum which starts swinging 1 cm from a wall to 5 cm from a wall, not losing any momentum, and slowly movin...

- Sun Dec 02, 2007 4:26 am UTC
- Forum: General
- Topic: Who the dickens are you?
- Replies:
**10922** - Views:
**2418777**

### Re: POST HERE FIRST - INTRO THREAD THE THIRD

Hello, my name is Patrick and I enjoy math, I've browsed around the forums for a while and thought id make myself known .

- Sun Dec 02, 2007 4:22 am UTC
- Forum: Mathematics
- Topic: More advanced sinusodial functions.
- Replies:
**3** - Views:
**1269**

### More advanced sinusodial functions.

Hello; I am an honors mathematics student in canada, currently taking grade 12 advanced math, and planning on taking Advanced Calculus next year. I have a question that's been bothering me for a while, and I thought this would be the best place to know.[ Now, in a Sin function I know that(I think, i...