Science & Mathematics - 30 December 2006

2006-12-30 04:34:49 · 7 answers · asked by jack r 1 in Engineering

2006-12-30 04:34:42 · 8 answers · asked by gary p 1 in Physics

How can I make a laser alarm? I'm just getting into electronics, so if there is a design that isn't too complicated that would be nice. By laser alarm, I mean those things that set of an alarm when you block the laser from hitting the receiver.

2006-12-30 04:34:05 · 2 answers · asked by awesomerobotguy 2 in Engineering

Which of the following is a spontaneous process?
a) freezing of water @ 40 c
b) melting of ice @ -273 c
c)freezing of water @ -24 c
d) melting of ice @ -24 c

Which of the following correctly represents an exothermic reaction?
a) triangle H < 0
b) triangle H = 0
c) triangle H > 0
d) triangle H = 1

2006-12-30 04:33:41 · 6 answers · asked by queenpravato 1 in Chemistry

2006-12-30 04:30:54 · 14 answers · asked by Anonymous in Chemistry

In the movie "star War's. there are mamny scenes showing spacecraft proplsion. Researchers have not yet gotten the Faser-Than-Light hyperdrive to work. Can you explain why this is true using newton's three laws?

2006-12-30 04:29:13 · 4 answers · asked by Anonymous in Astronomy & Space

Ok i just got a pair of Celestrons 10x50 Optiview LPR and used them for the first time tonight. Clear skies are scarce you know. But anyways, when looking at the moon there is a severe glare/reflection from the lenses, like when looking at a light source through doubledglazed windows. Have the binoculars been damaged or whats the story??
thanks

2006-12-30 04:27:39 · 2 answers · asked by benabean87 2 in Astronomy & Space

2006-12-30 04:27:01 · 8 answers · asked by mazza 1 in Mathematics

is this right?Am I missing or did I add something wrong in teh list?
1. Nucleus
2. Ribosome
3. ER (smooth and rough)
4. Golgi apparatus
5. Lysosomes
6. Peroxisomes
7. Mitochondria
8. Chloroplasts
9. Mictrotubules, if, Microf.
10. Flagella, cilila(organelle?)
11. Centrioles
12. cell walls(organelle?)
13. Vacuoles and vesicles(organelle?)
14. cell junction

2006-12-30 04:26:59 · 2 answers · asked by avalentin911 2 in Biology

i think it should only in the developed countries

2006-12-30 04:25:55 · 13 answers · asked by Anonymous in Engineering

the amount of heat required to raise temperture os 1 gram of a sub. by 1 degree celius is called ?

heat vaporazation?
vapor pressure?
heat of fusion?
specific heat capaity?

2006-12-30 04:22:16 · 7 answers · asked by sibelly 1 in Chemistry

2006-12-30 04:22:08 · 25 answers · asked by ruchi_eager 2 in Mathematics

2006-12-30 04:21:58 · 8 answers · asked by Anonymous in Earth Sciences & Geology

2006-12-30 04:21:15 · 10 answers · asked by Zefram 2 in Astronomy & Space

2006-12-30 04:18:11 · 8 answers · asked by lallous_metal 1 in Astronomy & Space

2006-12-30 04:17:36 · 3 answers · asked by poorqwq 1 in Mathematics

2006-12-30 04:15:03 · 7 answers · asked by jenkins_nichole 2 in Biology

hibiscus is mesophyte and colacasia is monocot

2006-12-30 04:14:50 · 1 answers · asked by manoj j 1 in Botany

2006-12-30 04:13:16 · 9 answers · asked by Anonymous in Mathematics

how are bacteria ?where do they live ? what do they eat ?what is there use ? how r they harmfull?

2006-12-30 04:12:44 · 6 answers · asked by vipul n 1 in Botany

hibiscus is mesophyte and colacasia is monocot

2006-12-30 04:11:02 · 2 answers · asked by manoj j 1 in Botany

Every time I use my cellphone near a TV, or especially computer speakers, they speakers get this static interference, even when theres no sound coming from them otherwise. What about cellphone activity makes the signals interfere?

2006-12-30 04:03:59 · 3 answers · asked by Anonymous in Other - Science

I am also a geophysicist. My experience includes exploration and production. I was running a mudlogging company reciently.

I live in Houston, Texas

2006-12-30 04:03:49 · 14 answers · asked by oak12349 1 in Earth Sciences & Geology

what are characteristics of artisian water

2006-12-30 04:03:34 · 5 answers · asked by Cris p 1 in Earth Sciences & Geology

2006-12-30 04:01:00 · 6 answers · asked by Alan D 1 in Mathematics

Writing a paper on Einstein and i need a bit of help, anyone know anything important that i could put in about the unified feild theory?

2006-12-30 04:00:07 · 9 answers · asked by suicidal_imperfection 1 in Physics

I'm trying to do the students t-test, and i'm not sure what my degree of freedom is.

I'm comparing 2 sets of data, in one set of data i have 35 samples and in the other i have 31 samples. How do i know what my degree of freedom is??? PLEASE HELP??????

2006-12-30 03:53:24 · 4 answers · asked by me_girl_06 1 in Mathematics

Do plants have a circulatory system? or one that is like our own circulatory system...

--please give sources......

thanks...

2006-12-30 03:52:38 · 5 answers · asked by darkael08 3 in Botany

This is a hint for my previous question, think about it. Nicol's reply is partially correct but there is further reasoning required in my opinion. Best of luck.

2006-12-30 03:49:29 · 8 answers · asked by rrastogi_1998 1 in Geography

2006-12-30 03:41:51 · 2 answers · asked by Zefram 2 in Zoology