Science & Mathematics - 29 September 2007

Two miles upstream from his starting point, a canoeist passed a log floating in a river's current. After paddling upstream for one more hour, he paddled back and reached his starting point just as the log arrived. Find the speed of the current.

I don't get it, how do I calculate it from this info?

Please be clear, thanks!

2007-09-29 17:41:36 · 2 answers · asked by teendeviant 3 in Mathematics

2007-09-29 17:40:58 · 9 answers · asked by jumbledupmess 2 in Chemistry

2007-09-29 17:40:56 · 8 answers · asked by Anonymous in Astronomy & Space

She is 13..Is she able to see it ???

2007-09-29 17:35:10 · 5 answers · asked by ~Crazy~ 1 in Astronomy & Space

i cannot beleve there are so many stars and galaxies as scientists tell.

personally i think all telescopes are bunch of toys taking fake pictures. there are only 5000 stars in universe and they're fixed to solid firmament as mentioned in Genesis.

solar system is a lie and earth is flat immobile circle.

please take bible literally or you are a fool. scientists should grow up too.

http://www.theflatearthsociety.org/

2007-09-29 17:33:41 · 15 answers · asked by Anonymous in Astronomy & Space

I am looking for a left handed smoke shifter and a flux capacitor.
any help would be most appreciated.

Thank You

2007-09-29 17:29:12 · 4 answers · asked by kc2mfh 4 in Engineering

even light from a reflection has depth from the proton's. does this mean that everything is 3 dimension on this planet? and if this is so, how can space be more than 3 dimensions? since time is an illusion based on mans attempt to control his environment, it seems that time is not the 4th dimension. just some random thought today on spacial theorems.

2007-09-29 17:25:55 · 3 answers · asked by 1001001 2 in Physics

i heard that our planet isn't exactly a circle.Where is the dent in our planet are there any pictures?

2007-09-29 17:21:25 · 8 answers · asked by Anonymous in Astronomy & Space

physics pls

2007-09-29 17:19:58 · 4 answers · asked by PaLoS 1 in Physics

2007-09-29 17:17:32 · 2 answers · asked by Maria Margarita C 1 in Physics

need basis on physics

2007-09-29 17:17:13 · 3 answers · asked by PaLoS 1 in Physics

Ok so im in pre calc 2 and have a test in a few day and cant figure this type of problem out!!!! My teach is really not alot of help.

it says find the exact value of each expression, with out using calculator
i under stand this problem...
(sin^ -1) (1) thats suppost to be read as inverse sin of 1. but i cant really type it right on here. but all you do is go to Sin= 1 on the unit circle and thats = to π / 2 (thats pi over 2)
i also get all the other ones like that but...

how do i do this one...
(sin^-1)((cos)(2π / 3)) i know the answer is -π/6 but how do i get that? Please explain!!!!!!! thank you so much

also other ones i cant solve but is the same way

(cos^-1)((tan)(3π/4))

Tan^-1 ( tan (7π/4))

Cos^-1 (cos(7π/6))

thank you for all the help you may provide! if anything simplify your explaination as much as you can lol thank you again have a great day

2007-09-29 17:17:08 · 2 answers · asked by It can only be me! 1 in Mathematics

I'm looking to buy a tri-fuel generator. The one I'm looking at not only produces 110V but also 12V for charging a bank of batteries. How does it do this? Does it have two alternators, one for each voltage? If I'm only using the generator to charge my 12V bank of batteries, is it not the most efficient option because it's also doing 110V at the same time?

Thanks!

2007-09-29 17:17:02 · 4 answers · asked by busboy 2 in Engineering

Okay, so here goes:

I've been reading about Niels Bohr and Heisenberg, and the whole nature-of-the-atom thing. Really geeky-cool! But now I have this VERY specific question, one that hasn't been answered by searching through countless webpages.

The electrons going around the nucleus can only exist in certain orbits - and they don't actually travel from one orbit to the next. Instead, they disappear in one orbit, only to reappear in the one above or below.

Alrighty: where are they when they're in between? Since they're like waves, are they actually *cancelling one another out*, like the crest and trough of a wave do? That would make sense, but that conclusion is only an extrapolation from what I've read... and a long shot at best.

Maybe this one of those questions that nobody really knows the answer to, yet? I hope someone can satisfy my curiosity!

Thanks in advance,

-K

2007-09-29 17:12:00 · 6 answers · asked by Anonymous in Physics

If so, is it as cool, as sweet and mystifying as our moon's light?

2007-09-29 17:09:15 · 4 answers · asked by quidwai 4 in Astronomy & Space

I am interested in becoming a doctor in the future, is the any good books about the medicine or the medical field that you would recommend me to read? I don't care if it is boring or anything, i just want to read something that would help me in the future.
Thanks.

2007-09-29 17:08:15 · 2 answers · asked by Jeff L. 2 in Medicine

faster average speed depending on the surface, but does the rate at which it decelerates follow the same rules as it would on any surface, or does the deceleration rate change and not obey any rules. for example, a falling object accelerates 9.8 m/s/s and after the 2nd second you would multiply that by 2 after three seconds you would multiply that by 3 and so forth...it basically follows a rule regardless of mass. my question is whether an object will become slower on a ruff surface at a much faster rate than it would if it were on another surface which was more smooth. i already know it will go slower from the get go.

2007-09-29 17:05:39 · 2 answers · asked by Backtash123 1 in Physics

3-gons
6-gons
8-gons
or which two?

2007-09-29 17:04:39 · 1 answers · asked by iluvbarbie115 2 in Earth Sciences & Geology

A parallel universe would appear to require the existence of supernatural phenomena that we cannot comprehend with our limited sensory perception. If that's the case, are we then trapped in a finite existence through sheer cosmic accident?

2007-09-29 17:04:36 · 4 answers · asked by steve e 1 in Astronomy & Space

2007-09-29 16:56:33 · 2 answers · asked by Anonymous in Mathematics

this has something to be with physics. the frequencies may seem to be higher as it approaches a boil.. i want to know what exactly happens in the kettle.

2007-09-29 16:53:56 · 2 answers · asked by lipids 1 in Physics

2007-09-29 16:51:27 · 10 answers · asked by Sarah Nicole 3 in Biology

2007-09-29 16:50:37 · 2 answers · asked by Anonymous in Mathematics

It's for science. I am so confused. Can someone help me out? Here's the first question:

___ Ca + ___ O2 ---> CaO

Ca = Ca =
O = O =

(The ____'s are blanks and the 2 is meant to be the, uh, "small two" Sorry I'm so untechnical.)

I'd love any help.

2007-09-29 16:47:16 · 5 answers · asked by Fuze 1 in Mathematics

Which statement is true? Their perimeters are equal?
Their areas are equal? Or both?

2007-09-29 16:41:14 · 10 answers · asked by iluvbarbie115 2 in Mathematics

If anyone could help me solve this problem, I'd be very appreciative! My teacher did not go over it in class and I'm very clueless... Thank you!

Find a formula that expresses the fact that P(x,y) is a distance 10 away from the origin.

2007-09-29 16:40:25 · 2 answers · asked by ragazza.chica.kella 2 in Mathematics

Please help!

2007-09-29 16:38:46 · 10 answers · asked by iluvbarbie115 2 in Mathematics

find an equation for the line with the given properties. Express the answer using the general form or the slope-intercept form, whichever you prefer.

Parallel to the line 2x -y = -2; containing the point (0,0)

can you explain how you solve this

2007-09-29 16:36:30 · 5 answers · asked by w s 3 in Mathematics

find an equation for the line with the given properties. Express the answer using the general form or the slope-intercept form, whichever you prefer.

Parallel to the line y = 4x; containing the point (-1,2)

can you explain how you solve this

2007-09-29 16:35:15 · 6 answers · asked by w s 3 in Mathematics

the given pairs of lines intersects. Find the point of intersection.

L: x + y = 5
M: 3x - y = 7

can somebody explain how you solve this

2007-09-29 16:30:40 · 12 answers · asked by w s 3 in Mathematics