Science & Mathematics - 16 November 2007

2007-11-16 04:05:10 · 2 answers · asked by Anonymous in Mathematics

f cos A =4/5 and cos B = 12/13, what is the value of cos (A – B) ? [Note: cos (A – B) = cos A cos
B + sin A sin B.]

2007-11-16 03:59:53 · 5 answers · asked by Anonymous in Mathematics

I'm a visual artist and I make process drawings using a simple, 3 digit code. the code can be very short or very long, but the number of units is always set - if you take the series of lengths of the code, you get this:
3, 7, 23, 87, etc.
i can see the relationship between these numbers (the value of the new number equals that of the previous one, plus 4 to the power of the ordinal value of the previous one), but I want to know whether this is sequence that comes up anywhere else... and how can I express this in a proper way?

2007-11-16 03:59:14 · 1 answers · asked by i don't know 1 in Mathematics

I remember several years ago, when I was in year six or something like that, there was a great hoo-ha about a meteorite which was headed straight for us and would hit in about 31 years time. What ever happened about that? Was it even real? Or are we all doomed?

2007-11-16 03:58:33 · 5 answers · asked by Lynsey W 1 in Astronomy & Space

in trangle ADB , angle D is 30 and angle B is 45 If AC with length 25 is drawn perpendicular from A onto to BD which is point C , what is the length of BD ?

2007-11-16 03:55:34 · 6 answers · asked by Anonymous in Mathematics

How much energy would be required to eject all the electrons from .10 mol of F ^(8+) in the n=2 state. Experess your answers in kJ

2007-11-16 03:54:38 · 1 answers · asked by Holly H 1 in Chemistry

2007-11-16 03:54:10 · 5 answers · asked by Anonymous in Mathematics

whenever there's change in kinetic energy, there's change in potential energy ? ..

My problem is involving a horizontal force is acting on a horizontally moving particle, then I am asked to find the potential energy U ... how can such particle ( moving horizontally ) have a potential energy ? ...

As I know, a potential energy means mass x g x y .... in above problem there's no change in y ( height ) ....

Please help me figure this point out ... thank you very much

2007-11-16 03:53:40 · 5 answers · asked by Learner 1 in Physics

will this lead to end of life? will it collide or something like that? where did it suddenly come from?

2007-11-16 03:49:34 · 14 answers · asked by Anonymous in Astronomy & Space

In other words, why is the solar system arranged the way it is?

2007-11-16 03:48:38 · 4 answers · asked by Jansen J 4 in Astronomy & Space

For all integers such that 00 , which of the following defines the solution of (1/yk)(-3)?
A. Positive
B. Negative
C. 0
D. Imaginary
E. Undefined

2007-11-16 03:47:12 · 6 answers · asked by Anonymous in Mathematics

are they the same thing or different?

2007-11-16 03:47:01 · 1 answers · asked by aziz 1 in Medicine

I'm way out in the country and want to see the Comet Holmes, where should I look? I am on the South East tip of Prince Edward Island in Canada. Thanks for any help.

2007-11-16 03:44:11 · 6 answers · asked by j h 2 in Astronomy & Space

It's now bigger than the sun and still seems to be growing....
Thanks for the answers!!

2007-11-16 03:41:50 · 9 answers · asked by Anonymous in Astronomy & Space

2007-11-16 03:41:47 · 2 answers · asked by Anonymous in Earth Sciences & Geology

2007-11-16 03:40:40 · 11 answers · asked by david f 1 in Engineering

I understend QRS , but what specificly height of QRS means? At rest it is shorter than after exercise , whay?

2007-11-16 03:39:06 · 0 answers · asked by Anonymous in Medicine

i looked in all the sites and i am not getting it. the matter must be 25 pages minimum. this is for my project and it has marks so please help me!

2007-11-16 03:34:14 · 2 answers · asked by Anonymous in Mathematics

I'm cramming for an online anatomy class and I have completely forgotten how to do this....if I could at least see the steps necessary to complete this, that would be AWESOME!! thanks sooooo much!!

(it's multiple choice and the possibe answers are:
a. 36
b. 38
c. 3600
d. 3800

2007-11-16 03:33:20 · 5 answers · asked by gymnastics=life 2 in Biology

We are doing a project where we have to launch a plastic golf ball exactly 4.5 meters using a cheap $1.50 mousetrap and we are looking for suggestions as how to achieve exactly 4.5 meters.

2007-11-16 03:31:33 · 2 answers · asked by Anonymous in Engineering

What are the side lengths if it is the smallest triangle with hypotenuse > 10^15 ?
Please prove your answer mathematically.

2007-11-16 03:19:01 · 2 answers · asked by Anonymous in Mathematics

I want to purchase an inexpensive telescope but I still want to see planets. I have no idea what all the magifications and stuff means. Please help.

2007-11-16 03:16:17 · 9 answers · asked by starryeyes06 1 in Astronomy & Space

2007-11-16 03:14:36 · 10 answers · asked by Anonymous in Mathematics

plz help me!!!???

2007-11-16 03:14:32 · 8 answers · asked by skaterchick4212@yahoo.com 1 in Geography

The range of human hearing is roughly from twenty hertz to twenty kilohertz. Based on these limits and a value of 325 m/s for the speed of sound, what are the lengths of the longest and shortest pipes (open at both ends and producing sound at their fundamental frequencies) that you expect to find in a pipe organ?

A. shortest pipe ? m
B. longest pipe ? m

2007-11-16 03:10:35 · 1 answers · asked by Anonymous in Engineering

does some one know how to calculate the dipole moment........for instance say NH3.......

2007-11-16 03:10:27 · 3 answers · asked by shreyas 2 in Chemistry

x/y*x/5y^2

2007-11-16 03:08:37 · 2 answers · asked by lisa g 1 in Mathematics

2007-11-16 03:08:35 · 5 answers · asked by Mark G 7 in Engineering

Use the bounds test to determine the integer low and upper bounds for the real zeros of f(x)=x^5+5x^4-x^3+5x^2+4x-3

2007-11-16 03:05:43 · 1 answers · asked by Ayy Girl! 1 in Mathematics

10a^2 + a - 3


also...

50x^2 - 72

2007-11-16 03:03:28 · 5 answers · asked by C'est Comme Un Rêve 3 in Mathematics