Science & Mathematics - 10 September 2007

I find it surprising that those who ask questions seldom vote on the answers received. Is this not rather rude? What do you think?

2007-09-10 06:48:39 · 9 answers · asked by Como 7 in Mathematics

give an example of a situation in which you would use a Schottky diode(as a discrete device).

What are the advantages in this situation?

2007-09-10 06:46:14 · 2 answers · asked by sh 1 in Physics

Give an example each of a semiconductor material that can produce red, green, and blue LEDs

2007-09-10 06:45:07 · 1 answers · asked by sh 1 in Physics

Give an example each of a semiconductor material that can produce red, green, and bkue LEDs

2007-09-10 06:41:16 · 2 answers · asked by sh 1 in Engineering

give an example of a situation in which you would use a Schottky diode(as a discrete device).

What are the advantages in this situation?

2007-09-10 06:38:04 · 4 answers · asked by sh 1 in Engineering

I have been told by many members at my fire dept (where i work ambulance, many nights now) and they have mentioned the ghosts there. Some of them not so friendly. I didnt believe it but some very believeable people have told me all the same things. They said that fire depts are often haunted by the firemen who made it their life when they were alive. Is this true? how can I tell if there are ghosts? i am working lots of midnites and it creeps me out alittle. I can email with specifics. Just curious about the truth of it all, Serious answers only

2007-09-10 06:30:40 · 11 answers · asked by Anonymous in Paranormal Phenomena

2007-09-10 06:28:28 · 14 answers · asked by Buzzard 7 in Astronomy & Space

x=1+t, y=2t, z=4-3t

Ok I can say t = 1 - x
and plug it in for y = 2t
y = 2(1-x) = 2 - 2x

But I didn't include z so how can this be a line... I'm so confused I really need help.

2007-09-10 06:28:20 · 6 answers · asked by Axis Flip 3 in Mathematics

2007-09-10 06:28:07 · 4 answers · asked by Anonymous in Mathematics

What is the answer to 3h divided by h

2007-09-10 06:27:40 · 7 answers · asked by corka89 1 in Mathematics

and if the answer is yes what would be the reason,

2007-09-10 06:23:14 · 11 answers · asked by some people are rude 2 in Astronomy & Space

For instance, I type the following into my calculator:

(1/3)^8

It then spits back at me a long number to a power of ten:

1.524157903 E -4

I would like to view this number as a fraction, but selecting it as a fraction from the MATH menu does not work. It also does not help to change the mode of the calculator.

I know that the number CAN be written as a fraction (1/6561). I just need to know how to arrive at that.

2007-09-10 06:21:19 · 4 answers · asked by chrizzle08 2 in Mathematics

the first derivative test yields complex roots.. how to proceed...
the function is
f(x,y) = (x^3) + (3*x*x*y) -15 (x*x) -15 (y*y) +72x

2007-09-10 06:17:33 · 2 answers · asked by Sudhakar A 1 in Mathematics

You can find mathematical puzzles and teasers like this one at http://www.mindchallenger.com The answers are there and new puzzles are added at the beginning of each month.

I would like to see the method you use to solve this and determine the numbers for each letter.

EVE/DID = 0.TALKTALKTALK...

2007-09-10 06:15:52 · 4 answers · asked by J S 2 in Mathematics

www.randi.org offers $1 million to an individual who can demonstrate, in a controlled setting, that they have "super" powers. You even get to say what power you have, agree on a protocol, etc.

The offer has been out there for years.

2007-09-10 06:13:26 · 6 answers · asked by Bill 6 in Parapsychology

sin a = sin 180-a please prove or explain
(a=alpha)

2007-09-10 06:11:47 · 4 answers · asked by Anonymous in Mathematics

Let f(x) = -2 - x^2. Find the following:

f(3 + h) - f(3)
-------------
h

Been working on it a while and can't seem to get rid of some pesky things. Thanks much.

2007-09-10 06:10:01 · 2 answers · asked by AppleCard! 2 in Mathematics

2007-09-10 06:03:12 · 15 answers · asked by Eleanor T 3 in Mathematics

/ - means the fraction line

2007-09-10 06:03:08 · 4 answers · asked by dragoi_stefan06 2 in Mathematics

The unmanned Zephyr flew 58,555 feet in the air for 33 hrs. using power from solar panels on its wings. The Zephyr is a British project tested in the New Mexico, USA high desert as reported from London.

2007-09-10 06:00:37 · 5 answers · asked by Anonymous in Astronomy & Space

For those who havent a clue what it is then.....

http://en.wikipedia.org/wiki/Chronovisor

2007-09-10 05:58:54 · 5 answers · asked by vasquez109 2 in Other - Alternative

Assume the ratio of air/fuel is 14.3 : 1 by volume, normal unleaded fuel for a car, but what is the CO2 in weight. The media quotes CO2 released into atmosphere in (tons), I assume metric. A follow-up is how much volume is 1 lb CO2 at sea level, 72 degrees F?

2007-09-10 05:51:51 · 1 answers · asked by WillCroxton 1 in Chemistry

(-2)^3+(-4)^2
-------------------
3-5^2-3(-6)
using the order of operations? any help will be greatly appreciated....

2007-09-10 05:50:51 · 9 answers · asked by imabrat 2 in Mathematics

What is 10 % of 12,000, any one please?

2007-09-10 05:48:07 · 14 answers · asked by half pint 2 in Mathematics

So I'm normally pretty decent at these but I can't seem to get this one, I think it's because the denominators are equal but anywho, can anyone help me out with this question:

[Intg from 5 to 12] (9x)/(x^(2)+4x+4)
Determine the numerical values of the coefficients, A and B, where B is less than or equal to A in
A/denominator + B/denominator
A=? B=?

I broke it up into A/x+2 and B/x+2 But that gives the equation of 9x=A(x+2)B(x+2) so I don't really know where to go from here...Do I have to do anything with the 5 and 12? Eeek, help! Thanks y'all!

2007-09-10 05:47:34 · 2 answers · asked by Anonymous in Mathematics

Compare the acceleration on stopping with the acceleration of gravity.

2007-09-10 05:45:28 · 5 answers · asked by Anonymous in Physics

ln(9-3x)= -3

How can I solve for "x"?

also, ln(ln(x))=1??

2007-09-10 05:42:29 · 6 answers · asked by Anonymous in Mathematics

Thanks!

2007-09-10 05:41:34 · 6 answers · asked by Anonymous in Chemistry

hey there! im having problems with my maths homework- we are doing probability the only thing is im not very good with cards so i cant quite finish 3 questions out of 50 will anyone help me with:
the probability as a fraction of:

drawing a king from a pack of cards,

throwing a prime number with a dice,

throwing a black king from a pack of cards.

thanks a lot!xxxx

2007-09-10 05:34:53 · 13 answers · asked by Anonymous in Mathematics

Hello I'm looking into buy my first telescope. Could anyone please tell me of an easy to use, yet multi functional telescope. Any price range is ok. Thanks!

2007-09-10 05:34:22 · 6 answers · asked by kristin22 4 in Astronomy & Space