Science & Mathematics - 13 August 2006

I'm not looking for a history of watches, or time pieces, I have researched that already. I'm looking for the origin of the association of the word "watch" itself with portable time pieces, and how or why it came to be.

2006-08-13 09:03:37 · 2 answers · asked by digital_signal_x 2 in Engineering

2006-08-13 09:00:30 · 26 answers · asked by mlk35 1 in Mathematics

2006-08-13 08:52:11 · 26 answers · asked by d@dz 5 in Mathematics

card a:
4/9/2
3/5/7
8/1/6

card b:
16/2/12
6/10/14
8/18/4


whats in common with these cards?

2006-08-13 08:51:59 · 6 answers · asked by ima lvl 0 pure!!!!!!!!!!!!!!!!!! 1 in Mathematics

please show steps so i can understand it

2006-08-13 08:51:39 · 13 answers · asked by Lily 2 in Mathematics

i need help on calculus, can anyone give me a good calculus website, anything PLEASE,

2006-08-13 08:48:40 · 11 answers · asked by ...i <3 Xavi... 2 in Mathematics

2006-08-13 08:47:39 · 35 answers · asked by mlk35 1 in Mathematics

2006-08-13 08:34:26 · 22 answers · asked by mlk35 1 in Geography

2006-08-13 08:33:44 · 14 answers · asked by David G 1 in Mathematics

2006-08-13 08:32:20 · 13 answers · asked by David G 1 in Mathematics

If so, how big are they?

2006-08-13 08:25:02 · 19 answers · asked by Julia M 1 in Biology

Why the Co-ordination number of silver is +1 and cobalt is +6?
please explain me.

2006-08-13 08:20:11 · 2 answers · asked by star123 2 in Chemistry

Well, Just though I'd ask.....

2006-08-13 08:17:49 · 8 answers · asked by Anonymous in Medicine

2006-08-13 08:17:40 · 11 answers · asked by Anonymous in Biology

What is N,N-dimethyl ethanamide?Here,what does "ethanamide"
means?

2006-08-13 08:14:07 · 0 answers · asked by star123 2 in Chemistry

Why complex ion has a metal ion at it's centre?

2006-08-13 08:10:54 · 5 answers · asked by star123 2 in Chemistry

2006-08-13 08:04:58 · 18 answers · asked by turtle 2 in Zoology

1.If the starting temp. is 5 deg. what is the new temp. if it rises 10 deg.
2.what is it if falls 2 deg.
3.what is it if it falls 10 deg.
and what if it rises 12 deg.


The STARTING TEMP IS 5 deg for all of those questions
thanks!

2006-08-13 08:03:10 · 7 answers · asked by Anonymous in Mathematics

whenever I drink so much alchohol and i wake up next morning, i become too much thirsty! why ??? I guess i am not the only one... isn't it??? but why?

2006-08-13 07:56:33 · 23 answers · asked by hacker_d26i 2 in Chemistry

science correspondent article on prof. don kurtz

2006-08-13 07:55:55 · 1 answers · asked by TERENCE OTTER 1 in Astronomy & Space

basic details on moon. how can we survive on moon.

2006-08-13 07:55:33 · 20 answers · asked by kamlesh m 1 in Astronomy & Space

this transition element is used to make both bronze and brass?

a metalloid it is the second most common element in the earths crust?

this alkaline earth metal is used by plants to make chlorophyll?

the 3 transitions elements used to make magnet?

an alkali metal used in making soap?

an akaline earth metals which burns with a red?

thx for anyone that helps me find this anwsers =)

2006-08-13 07:52:31 · 4 answers · asked by js_batres 2 in Chemistry

2006-08-13 07:52:30 · 3 answers · asked by ivan andrea d 1 in Other - Science

I approached this problem by first using the double angle formula.
sin 2x = 2 sin x cos x = cos x

I then divided each side by cos x...
2 sin x = 1

...and then divided each side by 2.
sin x = 1/2

So x = pi/6 or 5*pi/6.

However, when I checked the answers, the solution set also contained pi/2 and 3*pi/2.

I realized then that instead of dividing each side by cos x, I should have subtracted and factored.
2 sin x cos x - cos x = 0
cos x (2 sin x - 1) = 0
cos x = 0 OR 2 sin x - 1 = 0
cos x = 0 OR sin x = 1/2
x = pi/2, 3*pi/2 OR x = pi/6, 5*pi/6

My questions are: Why was my first solution not complete? How can I make it complete? Is there some rule against dividing by cos x (or sin x, tan x, etc)? Or do I need to consider if x is negative?

2006-08-13 07:51:27 · 7 answers · asked by Anonymous in Mathematics

2006-08-13 07:44:23 · 9 answers · asked by Mandy 3 in Astronomy & Space

I DO ! Mother - Nature can kick our butts any time she wants to ! I love watching what she can do. Tornados, Earthquakes, Hurricanes, Tsunamis, ect....ect....

2006-08-13 07:43:38 · 8 answers · asked by Midnights snow 3 in Weather

please show me how you come up with the answer

2006-08-13 07:38:45 · 10 answers · asked by theresa d 1 in Medicine

In the 1980s Radio Shack distributed a record cleaning protectant that they no longer make. When sprayed on the surface of the vinyl, the fluid QUICKLY evaporates right before your eyes. However, although no ingredients are listed the label says "non flammable and non toxic" and has a kind of "plastic" smell that seems to have a residue feeling on the hands after use - so that rules out Isopropyl Alcohol - but what other clear liquid dissolves or evaporates on contact?

2006-08-13 07:33:16 · 5 answers · asked by AslanMusic 3 in Chemistry

Can anyone tell me? Thanks!

2006-08-13 07:31:10 · 16 answers · asked by x me x 2 in Astronomy & Space

2006-08-13 07:30:18 · 16 answers · asked by Anonymous in Zoology