Science & Mathematics - 28 July 2007

Did the lights haven't reach the earth ?
bonikingv

2007-07-28 04:07:21 · 9 answers · asked by Anonymous in Astronomy & Space

My dad is suffering from a stroke, his left hand and left leg are
difficult to move (but he can move little bit), what is the best
medicine in the market beside excise?

2007-07-28 04:02:16 · 3 answers · asked by Steven T 1 in Medicine

2007-07-28 04:01:44 · 8 answers · asked by Anonymous in Mathematics

So I can build my own society, and can you build me a generator that will last 200 years?

2007-07-28 03:50:40 · 15 answers · asked by dsgc05™ 6 in Astronomy & Space

2007-07-28 03:48:06 · 5 answers · asked by akshay 1 in Engineering

water displacement or geometric means?

2007-07-28 03:43:59 · 3 answers · asked by x_lololol 2 in Chemistry

this is a question ask by my lecturer during class. it certainly not the matter of singular and plural.

2007-07-28 03:40:31 · 4 answers · asked by jitterbugs 1 in Chemistry

2007-07-28 03:31:45 · 1 answers · asked by Spector 1 in Physics

2007-07-28 03:31:10 · 9 answers · asked by octavia m 1 in Weather

I know that Harrison's is good, but what other internal medicne books are there in the market that are also good and what is the difference of the other book compared to Harrison's?thanks!!!

2007-07-28 03:30:19 · 2 answers · asked by Mike 3 in Medicine

2007-07-28 03:26:32 · 7 answers · asked by Michelle H 1 in Botany

Could you help me find professional scientific forums on fluid mechanics AND energy recovery

2007-07-28 03:18:37 · 2 answers · asked by saeed f 1 in Physics

I am curious to know, as I noticed that most females prefer tall males in their ad. on the internet dating pages! as they may think as that!!

2007-07-28 03:14:00 · 10 answers · asked by Anonymous in Biology

I've never done an integral like this, but this is what I've got so far:
Since the integral is in the form ∫ √(a² - x²) dx, i used the substitution x = asinθ, in this case
x = 2sinθ, so dx = 2 cosθ dθ.
When you plug it in you get:
∫ √(4 - (2sinθ)²) (2 cosθ) dθ =
2 ∫ √(4 - 4sin²θ) cosθ dθ =
2 ∫ √(4 (1 - sin²θ)) cosθ dθ =
2 ∫ 2√(cos²θ) cosθ dθ =
4 ∫ cos²θ dθ =
4 (1/2*θ + 1/4*sin(2θ) ) =

2θ + sin(2θ) + C

The problem is converting this answer back to x, which my book does not really discuss.
Since x = 2 sin(θ), θ = arcsin(x/2)
So 2θ + sin(2θ) + C becomes
2*arcsin(x/2) + sin(2θ) + C.
But how do you convert the sin(2θ)?
I tried the double angle formula and it didn't work well. The answer in my textbook is:
2*arcsin(x/2) + 1/2*x√(4 - x²) + C
I would greatly appreciate any help.

2007-07-28 03:13:42 · 5 answers · asked by MathGuy 6 in Mathematics

And how is it that the space shuttle can glide into the earths atmosphere upon returning from outer space, does it use any engine power?

2007-07-28 03:12:35 · 14 answers · asked by mike p 1 in Astronomy & Space

It's been annoying me for ages!!! lol

2007-07-28 03:07:17 · 23 answers · asked by Bruza 17/uk 3 in Physics

I know about how electricity is formed thanks to explanations of people on this website ,but what I really don't get is how a negative voltage works,when it occurs .Likewise for negative currents.

2007-07-28 03:06:19 · 11 answers · asked by Anonymous in Engineering

Would you please get the question.pdf here:
http://w13.easy-share.com/2469551.html
to get the file you could simply enter the code in the middle of the page and then get the file.

2007-07-28 03:03:33 · 2 answers · asked by saeed_x61 1 in Astronomy & Space

what was there before the big bang ?

2007-07-28 03:00:42 · 8 answers · asked by spankerpoligoli 1 in Astronomy & Space

Solve the triangle if angle B = 45 degrees, angle c = 95 degrees and side AB = 5 units. Use the law of sines.

2007-07-28 02:55:12 · 9 answers · asked by journey 1 in Mathematics

If so, how did you get started,and how did you make it work for you?

2007-07-28 02:53:27 · 15 answers · asked by john450630 2 in Parapsychology

Sightings to the same point at water level directly under the bridge are taken from each side of the 880-foot-long bridge.
The angle of depression on the left side under the bridge is 69.2 degrees; the angle of depression on the right side under the bridge is 65.5 degrees. How high is the bridge?

2007-07-28 02:47:10 · 1 answers · asked by journey 1 in Mathematics

what is the worlds strongest bear the Kodiak or the polar from a book i have it says that Kodiak bears are a bit bigger on average. please correct me if im wrong and tell me where you figured out this info. yeah any way i want to know the strongest

2007-07-28 02:46:48 · 2 answers · asked by Anonymous in Zoology

2007-07-28 02:43:21 · 6 answers · asked by Anonymous in Astronomy & Space

2007-07-28 02:41:35 · 13 answers · asked by DarK_ArchoN 1 in Astronomy & Space

a) 12a^7/8 / 3a^1/4
b) (a^2/3 b^5/6)(a^1/2 b) / (ab)^1/3
c) (a^1/4 b^3)^1/2 / (a^1/3 b^1/4)^-5
d) (a^1/2 + a^1/2)(a^1/2 - a^1/2)

2007-07-28 02:41:23 · 3 answers · asked by Anonymous in Mathematics

What is a simple chemical test to distinguish between ammonia solution and ammonium bromide solution?
Please give any equations as well if you can.
Thankyou.

2007-07-28 02:37:20 · 2 answers · asked by Questioner 1 in Chemistry

Did they go or where they stopped?

2007-07-28 02:33:47 · 10 answers · asked by Jeremy P 2 in Astronomy & Space

2007-07-28 02:32:26 · 2 answers · asked by Cleveo7 1 in Astronomy & Space

2007-07-28 02:30:30 · 5 answers · asked by Cleveo7 1 in Astronomy & Space