Science & Mathematics - 23 December 2007

so would it be a nice gesture for me to play some records in my room, while im not home

2007-12-23 16:53:52 · 17 answers · asked by Anonymous in Paranormal Phenomena

Sir, Is there any defination of "Pi"?If no then is it possible to define"Pi"?If no Then will u please help me for my thinking that
in case of circle
P=2*("Pi") R
"Pi"=P/2R
"Pi"=P/D
Does it mean that if we break a wire circle and make it straigth line then there is relation between the length of wire and diameter of circle?, then is it possible to define "Pi"?
If we make diameter perpendicular to wire line then the relations of that rightangle triangle,do they have any important relations in aerodynamics? i am mechanical engineer, finding technical answer for this question.Please help me........Thanking you.........Avdhoot B.(09822549363) INDIAN

2007-12-23 16:45:16 · 6 answers · asked by Avdhoot B 1 in Engineering

A man bought square patio tiles in equal numbers of black and white for $600, each tile costing some dollars and no cents. At home, he lays a rectangle of black tiles and lays a border of uniform width of white tiles around it, using up all the tiles. How many tiles did he buy?

2007-12-23 16:39:13 · 6 answers · asked by Scythian1950 7 in Mathematics

2007-12-23 16:38:59 · 21 answers · asked by joelinn1974 3 in Mathematics

http://flickr.com/photos/16469112@N07/2129923715/

Question 6a b and c.
With workings and explanation.
Thank you very much.

2007-12-23 16:38:16 · 6 answers · asked by Booyah! 3 in Mathematics

I know someone who has a friend who died this summer. Police investigated the cause of death, nothing suspicious. Toxicology results were negative and they didn't find anything. She was in her mid 50s and very healthy as far as I know. How can a person just die suddenly and not give an answer? If a person dies, that means something happened or something's wrong, right? Could something have been missed even though this was investigated for months? Why would the cause of death be undetermined if the person appearently died for a reason?

2007-12-23 16:34:13 · 8 answers · asked by Anonymous in Medicine

I have read "Against the Gods: The Remarkable Story of Risk" by Peter Bernstein. I was wondering (for those who have read it as well) if you could recommend any other books of this type. i.e. Non-fictional treatment of mathematical / statistical / financial concepts.

2007-12-23 16:32:28 · 3 answers · asked by Trouser 3 in Mathematics

Has there ever been any video recordings of an apparition manifesting without a human presence being near by?

2007-12-23 16:26:01 · 6 answers · asked by Arcanum Noctis 5 in Paranormal Phenomena

How does the Greenhouse effect and atmospheric radiation relate to each other? I am still trying to understand the "chemistry" aspect of the greenhouse effect, not just the simple explanation. My teacher says that the GHG effect isn't really "right" in a way (controversies) ... anyone want to explain this to me? I am confused.

2007-12-23 16:18:50 · 4 answers · asked by Anonymous in Chemistry

What materials remain in the blood as it passes through healthy kidneys?

2007-12-23 16:18:18 · 4 answers · asked by Em 3 in Biology

2007-12-23 16:15:43 · 5 answers · asked by priss~killa 2 in Biology

If equal amounts of nutrients are oxidized, the largest amount of energy will be released by
1. fats
2. proteins
3. carbohydrates
4. vitamins

2007-12-23 15:58:43 · 8 answers · asked by Em 3 in Biology

Mitochondrial DNA has delivered the proof that we all come from one man who lived 70 000 years ago.

2007-12-23 15:55:20 · 7 answers · asked by eRik 1 in Biology

2007-12-23 15:46:44 · 2 answers · asked by n_udoh 2 in Biology

I know for sure it's one of the two, my 10th grade teacher told me.

2007-12-23 15:46:17 · 16 answers · asked by Com T 2 in Geography

2007-12-23 15:45:03 · 10 answers · asked by parshin m 1 in Zoology

The 1st day of winter is the shortest day of the year - the day we are farthest away from the sun. Each day after the 1st day of winter, we get closer to the sun, but winter weather gets worse - colder, ice, snow, freezing fog, ect. It seems to me, the closer we get to the sun, the warmer it should be - can anyone make sense out of this for me?

Thanks,

Ken C.

2007-12-23 15:43:48 · 3 answers · asked by Anonymous in Weather

A function where the derivative is given by f ' (x) =3x^2+4x-7 has a local maximum at x= ???

2007-12-23 15:42:58 · 3 answers · asked by atlien2008 1 in Mathematics

i have been assigned to design an AB class audio power (for the final project of a basic course in electronics)amplifier using Opamp : 741 , power transistors BD137,138 , a 12 v. supply , load resistance 8 ohm , voltage gain of 40 dB and cut-off frequency 20 Hz. desperately needing help ! where shall i begin?!

2007-12-23 15:29:48 · 7 answers · asked by noushin 1 in Engineering

2007-12-23 15:28:52 · 3 answers · asked by Anonymous in Chemistry

and don't say because it reflects he color of the ocean

2007-12-23 15:27:52 · 15 answers · asked by juan o 1 in Earth Sciences & Geology

2007-12-23 15:26:19 · 6 answers · asked by Anonymous in Other - Science

2007-12-23 15:22:36 · 2 answers · asked by ReignInVictory 2 in Chemistry

And favorite period?

I like the Paleozoic era, Cambrian period

2007-12-23 15:19:29 · 5 answers · asked by Darth Nihilus 5 in Earth Sciences & Geology

single event where two or more people are unable to identify the same flying object?

Why is this so hard for some people to admit UFOs (whatever they might be) exist?

The British Defense Ministry is releasing their files of multi-corroberated sightings: http://www.upi.com/NewsTrack/Quirks/2007/12/23/britain_set_to_release_secret_ufo_files/3551/

If they don't exist, what is the British Defense Ministry releasing a list of?

2007-12-23 15:18:30 · 6 answers · asked by Wait a Minute 4 in Astronomy & Space

Is that what 4D looks like?

lol!

2007-12-23 15:18:29 · 3 answers · asked by Anonymous in Physics

What is the relative effenciency of plant processes in red shifted plants as opposed to their more conventional green cousins?

2007-12-23 15:16:26 · 2 answers · asked by brockpeterson 1 in Botany

A heap and its 1/7 part become 19. What is the heap?

Solution:
Assume 7
(Then) 1 (heap is) 7
(and) 1/7 (of the heap is) 1
(making a) Total 8
(But this is not the right answer, and therefore)
As many times as 8 must be multiplied to give 19, so many times 7 must be multiplied to give the required number.
The text then finds (by rather complicated arithmetic) the solution (7) x (19/8) = 16(5/8)

Today we would solve the problem by the equation

This question is run by the principle of proportionality.
But I cannot find out proportionlity in this question.

Running question by assuming 'sth' also seems to be strange for me. Can you help me?

2007-12-23 15:16:10 · 2 answers · asked by Jang Hee I 1 in Mathematics

2007-12-23 15:14:58 · 2 answers · asked by dustinthewind421 1 in Engineering

2007-12-23 15:14:37 · 7 answers · asked by Anonymous in Chemistry