Science & Mathematics - 10 December 2006

you can buy it in a bottle

2006-12-10 17:41:10 · 11 answers · asked by Anonymous in Chemistry

When a stone is dropped into water, the resulting ripples spread farther and farther out, getting smaller and smaller in amplitude until they disappear. Why does that happen?

2006-12-10 17:35:59 · 6 answers · asked by heyheyhey 2 in Physics

Given the latitude and time of year, how do I calculate the angle of the sun at any random date? For example, at 66.5°N, the angle of the sun is 0° on Dec 22, 23.5° on the equinoxes and 47° on the summer solstice. Am I correct in that the speed is not linear (ie the angle would change much faster around the equinoxes than around the solstices). What equation can I use?

2006-12-10 17:33:09 · 3 answers · asked by Anonymous in Astronomy & Space

i am on a weight loss program that is working perfectly for me, though, i had some quetions about the earth's gravity and weight.
i know (as all of us do) that our weight is measured by mass x gravity
the gravity of the earth is said to be 9.8
my question is: does it change with the fases of the moon?
e.g. full moon = more gravity ???, thus higher weight?
new moon = less gravity ???, thus lower weight?
how much would that be?

thanks for reading and answering.

love,
leen

2006-12-10 17:32:53 · 7 answers · asked by l j 1 in Earth Sciences & Geology

The box has 2x -5 on the top and the x is given on the side.

P = 50 inchs

2x - 5
--------------------
- -
- - x
- -
--------------------
Thats the best visual I can do for a box to help you answer my question.

2006-12-10 17:24:55 · 11 answers · asked by Mr.Archie G 2 in Mathematics

radical x - radical y
------------------------- =
radical x + radical y

I don't get why when you multiply by the conjugate (radical x - radical y) you get x- 2 radical x, radical y plus y, can someone explain how this works?

2006-12-10 17:23:34 · 6 answers · asked by ibid 3 in Mathematics

I cannot remember - when expanding a quadratic with variables only
eg - (st-tr)^2

do you square both of the variables or the "set"?

Would the answer look like?
A) (st^2 - 2st^2r + tr^2)
or
B) (s^2 t^2 - 2st^2r + t^2 r^2)

this isnt the whole question just a step in the question & I am forgetting my basic quad solving ....

Thanks

2006-12-10 17:22:40 · 6 answers · asked by cdawn 1 in Mathematics

this is not a trick question
I just wonder how much this number is or how i can figure it out with a calculator

2006-12-10 17:21:46 · 10 answers · asked by stillness 3 in Mathematics

I have about 15 strings of xmas lights of various lengths and sizes that I want to hang and light, but I'm worried that my energy bill will go through the roof...

2006-12-10 17:21:07 · 4 answers · asked by Stacy Cuccia 3 in Other - Science

2006-12-10 17:21:04 · 4 answers · asked by Manak 1 in Mathematics

At time zero a 0.27 kg book is sliding at 10.0 m/s, left. Bill is pushing the book with a force of 3.4 N, left, but the acceleration is 4.0 m/s^2, right. Calculate (a) the friction force (mag. & dir.) and (b) the velocity (mag. & dir.) after 1.5 s.

I've drawn a diagram but I don't understand how to solve. I'm not sure which equations to use or anything like that.

2006-12-10 17:20:26 · 3 answers · asked by acollins121 2 in Physics

i think if we actually been to the moon we would have webcams pointing at earth fom every angle

2006-12-10 17:19:01 · 10 answers · asked by T. 1 in Astronomy & Space

2006-12-10 17:18:09 · 5 answers · asked by Anonymous in Weather

2006-12-10 17:16:28 · 13 answers · asked by sameer_k97 1 in Mathematics

2006-12-10 17:15:22 · 4 answers · asked by travis p 1 in Mathematics

i need to know

2006-12-10 17:14:05 · 21 answers · asked by Anonymous in Mathematics

Suppose T: Rn ->Rm (please ignore the crudity of the expression of this) is a linear transformation. Provide counterexamples to each of the following statements, with an explanation of why each is correct. Note: you may not use the zero transformation, and T must be a linear transformation.

a) If m>n or m=n, T is surjective.
b) If m
have fun with this!

2006-12-10 17:13:42 · 3 answers · asked by slathered_in_sauce_sarcastic 2 in Mathematics

2006-12-10 17:12:02 · 5 answers · asked by darrenchye 1 in Astronomy & Space

i really need to know

2006-12-10 17:11:00 · 10 answers · asked by idrees r 1 in Mathematics

Can anyone help me solve this?
I need to solve this but I cant seem to figure it out.
Here is the actual text from the problem

"A continuous function is a function whose graph has no breaks in it.



One nice things about continuous functions is they have the intermediate value property: if (a 1,b 1) is on the graph and (a 2, b 2) is on the graph, then for every y-value b 3 between b 1 and b 2 there is an x value a 3 between a 1 and a 2 such that f(a 3) = b 3.

Anyway, let f be a continuous function with the following amazing property:

f(x) * f(f(x))=1

The astrik is a multiplication symbol.


(a) Find f(793)

(b) Justify your answer. "

Anyone got a clue?
f(x) * f(f(x))=1

The astrik is a multiplication symbol.

2006-12-10 17:09:41 · 3 answers · asked by Anonymous in Mathematics

One can dream sometimes

2006-12-10 17:08:38 · 5 answers · asked by Girl Goes Back To The Future 6 in Astronomy & Space

The first part is easy, you end up with x = 45 degrees. However, it is the domain the question gives ( -2pi <= x <= 2pi) that is giving me problems. I always forget how to rotate and get all the rest of the answers for the given domain. Thanks for the help!

2006-12-10 17:06:48 · 11 answers · asked by Robert 1 in Mathematics

Na2O + H2O --> 2*NaOH
eq. wt.: 62 : 18 : 80

The conversion factor is (80/62) = 1.29

I have the answer (1.50%).

I don't know how to get the answer. I am not sure the answer is right or wrong. Please help me.


Thank you very much.

2006-12-10 17:05:10 · 1 answers · asked by No Name 1 in Chemistry

2006-12-10 17:04:57 · 2 answers · asked by wildbutterflychick 2 in Earth Sciences & Geology

2006-12-10 17:04:32 · 5 answers · asked by s s 1 in Engineering

using solubitlity rules...?

2006-12-10 17:04:11 · 1 answers · asked by soilikepink 1 in Chemistry

Or are we too stupid to realise what to do?

2006-12-10 17:03:35 · 6 answers · asked by Girl Goes Back To The Future 6 in Astronomy & Space

If that is the case then 1084 will also be multiplied by 1084 and so on.

2006-12-10 17:01:07 · 3 answers · asked by amodgrover 1 in Astronomy & Space

Solve. x/6 + 3 = 9

2006-12-10 17:00:05 · 7 answers · asked by Mr.Archie G 2 in Mathematics

Solve. –3(10x – 3) + 10(3x – 3) = x – 7

2006-12-10 16:59:17 · 11 answers · asked by Mr.Archie G 2 in Mathematics