Science & Mathematics - 20 January 2007

If everyone in our class, including the teacher, shakes hands with everyone else, how mant handshakes will there be? So lets assume our class has twenty five people, thirty people, forty people, one hundred people? Figure out the formula for any number of people.

2007-01-20 13:24:10 · 8 answers · asked by Anonymous in Mathematics

2007-01-20 13:20:20 · 11 answers · asked by Anonymous in Chemistry

2007-01-20 13:19:41 · 7 answers · asked by nil_queen 3 in Astronomy & Space

This is a question that I always pondered about.

In the phenomenon of refraction, light bends away from the normal to make up for the increase in speed when it enters a rarer medium. Is this something really fundamental to physical laws.....

.... or is there a reason for light to show "signs of sentience"?

2007-01-20 13:19:09 · 8 answers · asked by Abhyudaya 6 in Physics

Is it because the current is used up or the energy is used up. Explain

2007-01-20 13:19:09 · 2 answers · asked by Melissa 2 in Physics

2007-01-20 13:18:22 · 9 answers · asked by inquisitorman2 1 in Mathematics

A cash prize of $1,000 is to be awarded by the Alpine Fireman Association. Suppose that 1500 tickets are sold at $1 each, and let x be the payoff.
1. Construct a probability distribution table for the payoff,x.
2. Find the expected payoff.

2007-01-20 13:17:16 · 3 answers · asked by sandeepownzzz 1 in Mathematics

Give me a website or I won't choose you as the best answer (I mean it).

2007-01-20 13:17:10 · 3 answers · asked by invisiboy_14 2 in Zoology

A woman starts traveling in a direction that is 45 degrees north of west for 6 mi. She then turns due west and travels for 4 miles. Finally she travels in a direction that is 30 degrees south of west for 3 mi. Draw a scale diagram of her path on graph paper.

a) Calculate how far north or south she ends up relative to her starting point.

I got 2.74 mi

b) Calculate how far east or west she ends up relative to her starting point.

I got 10.84 mi

c) Calculate how far is she overall from her starting point (straight line distance)

I got 11.18 mi

d) She points back toward her starting point. What direction is she point? (Be clear and exact)

And lastly I got 75.81 degrees east of south

My graph has 3 right triangles, thanks for the help

2007-01-20 13:17:00 · 5 answers · asked by Erin C 1 in Mathematics

one example of a water system is a garden hose that waters a garden. Another is the cooling system of an autombile. Which of these exhibits more analogous with that of an electric circuit? Why?

2007-01-20 13:16:38 · 4 answers · asked by Melissa 2 in Physics

Hi,

I have uploaded a set of question here: http://krydom.com/math1.doc

Can anyone provide me with the answers to the questions? Also, if possible show your work or an explanation for numbers 12, 14, 17, 18, 22, and 25.

Thank you.

2007-01-20 13:12:55 · 1 answers · asked by blcklabelx 1 in Mathematics

1. (2,0) and (5,9)
2. (5,-1) and (-2,3)
3. (-5,-2) and (-7, -1)
4. (2,-8) and (1,0)

answers:
A. sqrt 145
B. sqrt65
C. 5
D. sqrt 13
E. 3sqrt10
F. sqrt5
G. sqrt73
H. sqrt43

2007-01-20 13:12:29 · 3 answers · asked by hans d 1 in Mathematics

2007-01-20 13:09:23 · 9 answers · asked by Anonymous in Astronomy & Space

2007-01-20 13:05:27 · 12 answers · asked by Anonymous in Mathematics

x^3-2x^2-24x

2007-01-20 13:04:42 · 11 answers · asked by Anonymous in Mathematics

why does anything exist at all ? - why does matter exist?- why does the Universe exist?* what underlies the nature of physical laws ? - why do any laws exist at all?- why do they seem to have a mathematical nature?- in what way is their compulsory operation imbedded in reality?* what determines the nature of the specific laws that in fact govern the Universe ?- why do they have the specific form they do?

2007-01-20 13:04:42 · 3 answers · asked by Anonymous in Physics

David works at pet store. needs to make food for the lizards. mix has nuggets and calcium. he mixes 6 cups of nuggets and2 cups calcium to make it.
so if dave uses 8.5 cups of,calciums, how many cups of nuggets does he need.

2007-01-20 13:02:54 · 13 answers · asked by Anonymous in Mathematics

This is one of the topic in Microbiology.

2007-01-20 13:02:34 · 3 answers · asked by Tee M. 1 in Biology

i need the answer ahhh

2007-01-20 13:02:17 · 6 answers · asked by Anonymous in Mathematics

Discovered...-- who realized that there is a astronomical body amongst us?

2007-01-20 12:58:36 · 10 answers · asked by Anonymous in Astronomy & Space

please help me by monday

2007-01-20 12:58:27 · 2 answers · asked by Brent S 1 in Botany

The straight string of a kite makes an angle of elevation from the ground of 60 degrees. The length of the string is 400 feet. What is the the height of the kite from the ground?

2007-01-20 12:58:00 · 7 answers · asked by anonymous 2 in Mathematics

2007-01-20 12:57:23 · 9 answers · asked by Anonymous in Engineering

What would have to be true about any solvent for one of its dilute solutions to have essentially the same molar and molal concentrations?
This question is driving me wild the possible answers are the following. I doubt it has anything to do with the solutes miscibility with water, it's polarity, or it's molar mass being similar to water. Any ideas?

It must be miscible with water.
The volume cannot change appreciably as solute is added.
It cannot be volatile.
The density must be very close to 1 g/mL.
It must be polar.
Its molar mass must be close to the molar mass of water.

2007-01-20 12:56:24 · 3 answers · asked by sn1per0nther00f 3 in Chemistry

I have an employee who started work @ 8:50 am and finished work @ 8:20pm. He had 50 minute break. What is his total work time...Our drivers can't go over 11 hrs. worked..Please tell me how you got your answer so I can figure it out next time..Thanks

2007-01-20 12:56:22 · 3 answers · asked by hotgirl_rightgirl00 5 in Mathematics

i was in the pub yesterday and i did a big loud faart, and people started laughing!!

2007-01-20 12:55:53 · 11 answers · asked by qwerty 3 in Chemistry

2007-01-20 12:50:35 · 10 answers · asked by kim b 1 in Earth Sciences & Geology

(Would prefer a Math professors opinion)

1.Lets say variable x = 0.9999......[meaning its a repeating number]

2.Now lets times both sides by ten.
10x = 9.9999.......

3.Now lets subtract x from both sides.
(10x) - x = (9.9999.......) - x

4. Since x = 0.9999......[repeating]
(10x) - x = (9.9999......) - (0.9999.....)

5.Substract 9.9999..... from 0.9999......
(10x) - x = 9

6. Now substract x from 10x
9x = 9

7. Divide both sides by 9
x = 1

Does this mean 0.9999..... equals 1
I would think that 0.9999..... is a number that is infinitely smaller than 1 by 0.1111.....[repeating] or is there some sort of mathematical phenomenon that I'm unaware of.

2007-01-20 12:50:20 · 6 answers · asked by Andy 1 in Mathematics

What happens to the homologous pair of chormosomes during meiosis? And why is it that after meiosis there is only one chromatid in each gamete? How will this gamete make a homologous chromosome with only one chromatid?

2007-01-20 12:49:38 · 3 answers · asked by To-the-Stars 4 in Biology

this is my opinion on the world today.. the way i see it is religon is causeing more wars then it saves people from the Wrath of God... when its the people telling them to Worshop in a temple rather then spend time with Familys on so called religous Holy days.. why is it that something in the past it just not keept in a museum for old and un used things because why do they keep changeing the holy bible books to keep up with the science and technology of the word to day.. and when was it science was Herosey for about 500 years Because it was the Devil..... Lol devil is lived Backwards... um back to the many points im makeing religon is just a cult in the Countrys that are over run by Technology and the places that dont have the Tech stuff thats all they know and dont know its a cult or brain wash.. Because thats all they know with the place and time they liveing in if it was changed over there then RELIGON!!!! should and will be Vanised to all but just Museums they wil stay

2007-01-20 12:47:01 · 4 answers · asked by BKSTYLE 1 in Physics