Science & Mathematics - 18 December 2007

A space vehicle on reentry faces burning away like a meteor due to intense atmospheric friction because of which heat shields come into play. Now if it slowed down using onboard motors and leftover fuel, it could avoid atmospheric friction. Why does not this happen?

2007-12-18 23:49:02 · 10 answers · asked by prashanth_142 1 in Astronomy & Space

How do u make 2 divided by 3 into a fraction

2007-12-18 23:46:06 · 5 answers · asked by Wane B 1 in Mathematics

My dad LOVES ghost hunters on SciFi, and he asked for "something paranormal". I need to get somethign that follows teh scientific approach to ghost hunting that they use on the show (no wako stuff). Any good books, DVDs, investigation tools? We have a EMF detector, tape recorder, and thermometer already. Thanks!

2007-12-18 23:41:11 · 16 answers · asked by orlenda 5 in Paranormal Phenomena

2007-12-18 23:27:54 · 14 answers · asked by Anonymous in Agriculture

I say it isn't possible....is it?

2007-12-18 23:19:08 · 4 answers · asked by Anonymous in Mathematics

2007-12-18 23:18:56 · 3 answers · asked by Xyn 1 in Medicine

I know that water is poor conductor. However, if you put your hand onto poor conductor, you should feel warm. But the fact isn't that, water is cold. What I want to ask is why water is cold?
Is that because water absorb the latent heat of vaporization from your hand? Or it is because they are fluid?

2007-12-18 23:17:02 · 3 answers · asked by Anonymous in Physics

2007-12-18 23:00:57 · 14 answers · asked by Anonymous in Mathematics

If I obtain a p value of exactly 0.05, is that generally considered to be significant? Or does it have to be less than 0.05? My accepted p value is p < 0.05 but someone told me that p=0.05 is also significant.

2007-12-18 23:00:22 · 4 answers · asked by bunnyrabbit22 1 in Mathematics

2007-12-18 22:55:10 · 16 answers · asked by nicolalainchbury 1 in Weather

2007-12-18 22:54:56 · 11 answers · asked by Esty 1 in Astronomy & Space

hey, whats the HL theory? i kinda fell in sleep during geo class when my teacher was teaching this and theres a test on this tomorrow. i know it has to do something with the right angle.

2007-12-18 22:53:02 · 3 answers · asked by jason t 1 in Mathematics

2007-12-18 22:45:48 · 15 answers · asked by Anonymous in Physics

i want a short answer for this also do mention that y not stoppers of other materials like wood metal etc...

2007-12-18 22:45:45 · 2 answers · asked by midhat khatri 1 in Chemistry

2007-12-18 22:19:25 · 2 answers · asked by eventmanuniversal 1 in Astronomy & Space

2007-12-18 21:48:59 · 4 answers · asked by Leona B 1 in Mathematics

2007-12-18 21:48:11 · 8 answers · asked by truthseekers 2 in Earth Sciences & Geology

I just can't figure out how much this is. I only saw this from a certain website. I think it's British English but I'm greatly used with the American English. This is just like when you say it's 40 hundred when it really means 4 thousand. Please help me with this. I really need to know ASAP. Thx y'all ^_^

2007-12-18 21:48:05 · 6 answers · asked by Anonymous in Mathematics

Hi, I just need the answer for my homework. If your not sure, please don't give me an answer. Thanks

2007-12-18 21:47:20 · 3 answers · asked by PwN4g3 P1e 2 in Weather

But for a reason, no matter how hard we take precautions ourselves, the unexpected one shakes us, of one unexpected hour. The badness reaches us of surprise.

2007-12-18 21:41:15 · 6 answers · asked by Anonymous in Paranormal Phenomena

Ancient people how concluded that all glowing objects in the sky aren't star.
For me I always thought comets are fast moving stars with a tail,
planets also looked like star with a fix time schedule?
Is there any clue, which is noticeable to my bare eyes, that differentiates a star from other heavenly bodies in one gaze.
Please also tell me a method so that I can identify planets in night sky..
Thank you for your time.

2007-12-18 21:33:48 · 6 answers · asked by Fantail Flycatcher 3 in Astronomy & Space

Having had the experience this morning of a black scuttling horror in the shower, I wondered if this instinctive leg wobbling terror that overcomes many of us when spiders appear unbidden is confined to humans, or whether chimps react in the same way?

2007-12-18 21:07:52 · 9 answers · asked by Questioner 1 in Zoology

"there are many more species of venomous/poisonous reptiles (e.g. snakes), amphibians (e.g. poison dart frogs), and fish (e.g. stonefish). There are no species of venomous bird; however some birds are poisonous to eat or touch, such as the pitohui, the ifrita, and the rufous shrike-thrush. "

http://en.wikipedia.org/wiki/Venomous_mammals

2007-12-18 21:04:48 · 7 answers · asked by Calchas 3 in Zoology

2007-12-18 21:04:17 · 6 answers · asked by venkat n 1 in Earth Sciences & Geology

how fast does the brain transmit signals to various organs?

2007-12-18 20:50:24 · 9 answers · asked by HUSSAIN D 1 in Biology

2007-12-18 20:48:05 · 14 answers · asked by Anonymous in Zoology

2007-12-18 20:42:46 · 6 answers · asked by Some One 4 in Mathematics

Hi, I really need help on this question.
----------
Let f:R->R be a continuous function such that f(x)>0 for all x in R, and lim[x->∞] f(x)=0=lim[x->-∞] f(x).

Prove that there exists a real number c>0 such that
f(R)=(0,c]
------
Thank you so much

2007-12-18 20:38:45 · 1 answers · asked by Theodore E 1 in Mathematics

How it is working just within a second of swiping? And how it is blocked from the authority ? What is the technology behind this.

2007-12-18 20:34:51 · 2 answers · asked by sourav c 1 in Other - Science

Please have a look at this web album:

http://picasaweb.google.com/lucasjensen/LaminarFlow

You can click each picture and zoom in.

I have a situation where I need to look at a wall with a video camera. The video camera is mounted in a dusty environment where a constant flow of particles are moving downwards. I want to use pressurized air to remove the particles in the zone ahead of the camera. How should I design a device making it possible to blow away the particles in this area. Is it a matter of using many small pipes next to each other or generating different air speeds and hence different local pressures?

Thanks for your help,

Lucas Jensen

2007-12-18 20:30:53 · 4 answers · asked by Lucas 1 in Engineering