Science & Mathematics - 5 August 2007

2007-08-05 19:07:19 · 2 answers · asked by DiMaHaZiaF 1 in Chemistry

Verify that the equation is an identity . Please show me the steps.
( 1+ cos x / 1-cos x) - ( 1 - cos x / 1+ cos x) = 4 cot x csc x


find the exact value of sin ( A + B)
* sin A = 3/5 and cos A is negative
* sin B = 8/17 and tan B is negative

2007-08-05 19:06:42 · 4 answers · asked by bettylee 1 in Mathematics

also explain....because, when I look at the graph, it looks like its going to 2 or somthing, but I heard it may go to infinity. The graph doesn't do justice.

2007-08-05 18:57:41 · 3 answers · asked by Anonymous in Mathematics

2007-08-05 18:56:10 · 8 answers · asked by vidyacksp 1 in Mathematics

Remember nobody wants the nuclear waste in their own backyard!

2007-08-05 18:49:27 · 4 answers · asked by Gratisman 1 in Engineering

[(x^(2)y^(-3) over x^(-4)y^(-5))]^(1/2)

2007-08-05 18:48:04 · 4 answers · asked by Anonymous in Mathematics

i need to find the equations of all lines of asymptote for these equations but i don't know how
can someone please check my answers for these?

a. y = 3* (2^x) - 1 y = -1

b. y = 2 / (3+x) x = -3

c. y = (2x-1) / (x) x = 0

d. y = (3x+1000) / (x-5) x = 5

e. y = 2* [(3/4)^x] + 2 y = 2

2007-08-05 18:47:43 · 2 answers · asked by Anonymous in Mathematics

if yes can u describe it? plz no stupid answers

2007-08-05 18:47:12 · 6 answers · asked by Anonymous in Astronomy & Space

[(y^(-2) over y^(-3)]^(2/3)

2007-08-05 18:46:12 · 2 answers · asked by Anonymous in Mathematics

2007-08-05 18:45:36 · 8 answers · asked by Nikki R 1 in Medicine

Am I going to be ok?

2007-08-05 18:40:55 · 5 answers · asked by will H 2 in Medicine

a solution?

Stupid question, but I can't really think of why.

2007-08-05 18:40:49 · 4 answers · asked by JoeSchmo5819 4 in Mathematics

Currently I know very little about astral travel, but I'm slowly learning more about it...for right now, right here on Y!A I just have a quick question....

Is it possible to meet and/or interact with other people on an astral plane?

And also, if anyone has any links to helpful information for someone who is just learning about astral projection, that'd be great.

~SERIOUS ANSWERS ONLY, PLEASE~

Thank you. :-)

2007-08-05 18:36:52 · 13 answers · asked by Anonymous in Parapsychology

The density of potassium bromide, KBr, is 2.75 g/cm3 and it has the same structure as NaCl. A cubic unit cell consists of 4 K+ and 4 Br- ions. The atomic weights of K and Br are 39.1 and 79.9 respectively. Calculate the edge length of the unit cell a.


A. 0.702 nm
B. 0.564 nm
C. 0.354 nm
D. 0.416 nm
E. 0.660 nm

2007-08-05 18:30:10 · 1 answers · asked by waterlooguy 2 in Chemistry

(a) x² + 2x + 3 = 0
(b) 5x² - 4x - 2 = 0
(c) 2x² + 7x + 2 = 0
(d) 4x² = 5x - 21
(e) 2x² + 5x - 3 = 0
(f) 3x² + 8x + 2 = 0
(g) 7x² - 28x + 15 = 0
(h) 5x² + 12x + 3 = 0
(i) 2x² 3x - 4 = 0
(j) x² - 12x + 36 = 0

Show your working as done in exam format.

2007-08-05 18:09:21 · 2 answers · asked by Anonymous in Mathematics

1)r=(12)/(3+4 cos theta)
2) r=(23)/(7-5sin theta)

a) its directrix is vertical or hortizontal? why?
b) its directrix is above the pole, below the poler, to the right of the pole, to the left of the pole? why?

2007-08-05 18:06:29 · 1 answers · asked by ilovecoach 3 in Mathematics

I know, I know, this seems like a stupid question. But I read somewhere that you might be able to eat the ripe, dark berries on a deadly nightshade plant, and it may have medicinal effects rather than toxic effects.

I know for sure that the unripened green berries are poisonous-- thus the name: "deadly" nightshade.

But maybe they're both poisonous and I should just stay away... But curiousity demands that I ask the question!

2007-08-05 18:01:00 · 7 answers · asked by Anonymous in Botany

2007-08-05 18:00:37 · 1 answers · asked by speed demon 12309 1 in Botany

Can please someone tell me the answer to this question:

Regarding the theory of relativity developed by Einstein in 1905, which one of th e following statements is not true?

A. Einstein assumed that light always travels at a constant speed in vacuum of 299,792,458 or 3*108 m/s.

B. The relative mass m is always larger than the rest mass mo of any particle.

C. No particle or object can travel at a speed equal or greater than that of light.
D Energy released in a chemical explosion is proportional to the difference between the mass of all reactants and the mass of all
products.

E. The gain in kinetic energy by a particle can be achieved by losing its mass.

2007-08-05 17:57:37 · 8 answers · asked by waterlooguy 2 in Physics

It looks red to me

2007-08-05 17:57:21 · 9 answers · asked by SLP fanatic 3 in Earth Sciences & Geology

2007-08-05 17:53:36 · 2 answers · asked by Dave 3 in Earth Sciences & Geology

I know whales are mammals, but dolphins?

2007-08-05 17:53:27 · 11 answers · asked by Hotdog 1 in Zoology

For example, a 1 kilogram object traveling at 10 meters per second will generate 10 newtons, but how would translate into pounds? You always hear things like thing in accidents and they say (not to this particular problem) that when they hit the wall their body's generated 1000lbs of force. How did they determine that (i am assuming with g-forces, but i don't know how to calculate that either)?

2007-08-05 17:52:35 · 5 answers · asked by ozzy4president51 or sean 3 in Physics

Hi, I saw a spider today, and I do not know what it is. Can you help me? Here is a picture...
http://img.photobucket.com/albums/v291/mazdaclan/SPIDER-1.jpg
The spider was pretty big, about 3 inches.

2007-08-05 17:37:09 · 6 answers · asked by Anonymous in Zoology

2007-08-05 17:24:45 · 1 answers · asked by Anonymous in Biology

2007-08-05 17:23:17 · 2 answers · asked by Anonymous in Biology

Its famous psychic sylvia brownes prediction. she also said their not here to harm us , but here to teach us anti gravity technology as they did to the ancient Egyptions for the pyramids. thats cool i cant wait. what about u.

2007-08-05 17:21:41 · 12 answers · asked by DARK WOLF 2 in Astronomy & Space

2007-08-05 17:16:15 · 6 answers · asked by Anonymous in Mathematics

I was wondering if anyone could tell me how long most moon phases last. Is it 2-3 days? Or is it more?

2007-08-05 17:14:22 · 4 answers · asked by Anonymous in Astronomy & Space

Russia, US and other countries are doing it? Do you think this is how places like Mississippi, Luisiana, Burma, India, Sri Lanka are just guinea pig testing sites? Think about it what do all these places have in common?

Poor minorities.

2007-08-05 17:08:23 · 3 answers · asked by Anonymous in Other - Science