Science & Mathematics - 14 September 2007

I saw a house spider with only 3 visible legs on each side. Is this common?

2007-09-14 20:15:25 · 5 answers · asked by Z 1 in Zoology

2007-09-14 20:00:35 · 13 answers · asked by Christian F 1 in Astronomy & Space

2007-09-14 20:00:10 · 6 answers · asked by Sammers 1 in Physics

Chemical of water is h2o.H(hydrogen can be burnt easily).O(oxygen are needed for burning).Why these two chemical which can burnt easily when they mixed up, they can't burnt?

2007-09-14 19:51:32 · 15 answers · asked by Anonymous in Chemistry

2007-09-14 19:51:29 · 2 answers · asked by debby_ablao 1 in Medicine

mechanics, properties of matter, Electromagnetics and optics.

2007-09-14 19:34:20 · 6 answers · asked by Anonymous in Physics

2007-09-14 19:33:35 · 6 answers · asked by Asker 6 in Physics

Can anybody tell me what will be the workdone by magnetic field on a positive charge particle?

2007-09-14 19:32:57 · 7 answers · asked by HESHSHAM 1 in Physics

Gold is decribed as Red,Green,White, etc., and if I understand correctly, its' purity is measured in carats, 24 being the most pure.
How are the different colours arrived at? and if its by alloying the gold with other metals does this mean that coloured gold will never be 24 carat?

2007-09-14 19:32:30 · 10 answers · asked by Anonymous in Earth Sciences & Geology

Here's what I've done so far:

(8+x^3)(8-x^3)
(2+x)(4-2x+x^2)(2-x)(4+2x+x^2)
Can it be further factored?

Thanks all in advance!

2007-09-14 19:26:44 · 9 answers · asked by Anonymous in Mathematics

just kiddin :)

2007-09-14 19:23:40 · 12 answers · asked by Anonymous in Astronomy & Space

by the word biovillage i mean tosay that village that has thing the are ecofriendly

2007-09-14 19:20:50 · 2 answers · asked by sangeetha j 1 in Botany

2007-09-14 19:19:05 · 7 answers · asked by April 1 in Earth Sciences & Geology

2007-09-14 19:18:19 · 12 answers · asked by qwiklimegirl 3 in Astronomy & Space

please describe the changes that happen to form the sperm and the ovum

2007-09-14 19:13:27 · 2 answers · asked by j324 2 in Biology

2007-09-14 19:04:32 · 1 answers · asked by hammed 1 in Geography

2007-09-14 19:00:08 · 19 answers · asked by Anonymous in Astronomy & Space

a guy has offered me a job (conditional on him being able to scrounge some grant monsy etc.) and i am trying to check out his credibility in the field (which tells me both how good the job is and the likely hood that said grant money is worth waiting for). The job is only RA level, but it will still be good to work with the most reputable poeple i can find.

He doesn't seem to have any publications in the specific field the job would be investigating. I asked him for some recomended reading and he says he has a couple of paitents, and i have found a few with his last name and first innitial so that seems to check it out?

I want to find some of his other publications but he has a common surname and first innitial so it seems hard to fathom which are his. He has given some from his lab in general, which seem pretty goood, but i wanrt to check out his personal track record as well.

General advice from some scientists please?

2007-09-14 18:59:31 · 2 answers · asked by K 3 in Other - Science

Solve the following equations using either the quadratic formula or by completing the square.Give your answers to 2 d.p.

x2-35=0

and also
x2-3x-3=0[am i supposed to use the square for this?how exactly do you do this?]

I know im prob sposed to work these out myself but they're during tmr and im really stuck!
its one of my GCSE practice questions.There are bout 20 more but I just need to know the basics in order to do the rest.
thanks a mill.

Luvv,
Kris.

2007-09-14 18:55:30 · 6 answers · asked by krystal_engel 3 in Mathematics

Liquid Nitrogen is a liquid at 77 deg. Kelvin. To prevent it from warming and expanding to a gaseous state, at what temperature would I have to set a thermostat to keep it cryogenically cooled to 77deg Kelvin. In other words, does it take a lot of energy to keep it at that temperature?

2007-09-14 18:35:42 · 4 answers · asked by delta dawn 4 in Physics

As far as I know, no one knows why "m" and "b" are used.

2007-09-14 18:34:21 · 7 answers · asked by discover425 2 in Mathematics

Can anyone please tell me the difference? Thankyou!

2007-09-14 18:33:07 · 5 answers · asked by Anonymous in Medicine

2007-09-14 18:32:47 · 7 answers · asked by Anonymous in Mathematics

i think i know how to do this problem but i dont know how to do the conversion..
calculate the frequency of a photon with a wavelength of 6570 A

2007-09-14 18:32:35 · 2 answers · asked by chimstr 1 in Chemistry

The Heaviside function H is defined below. It is used in the study of electric circuits to represent the sudden surge of electric current, or voltage, when a switch is instantaneously turned on. The Heaviside function can also be used to define the ramp function y = ctH(t), which represents a gradual increase in voltage or current in a circuit.

http://www.webassign.net/www30/symImages/e/b/7b468910ea394002f905894a548898.gif

as seen in above link, H(t)={ 0 if t<0, 1 if t> or = 0

(a) Write a formula for V(t) in terms of H(t) if the switch is turned on at time t = 0 and the voltage is gradually increased to 140 volts over a 70 second time interval.

(b) Write a formula for V(t) in terms of H(t) if the switch is turned on at time t = 6 seconds and the voltage is gradually increased to 220 volts over a period of 55 seconds.

2007-09-14 18:29:55 · 1 answers · asked by ILuvTaraReid 2 in Mathematics

ex:india has it as 50 hz and US as 60 why??

2007-09-14 18:25:46 · 4 answers · asked by Arun 1 in Engineering

2007-09-14 18:20:11 · 7 answers · asked by Sarah S 1 in Earth Sciences & Geology

2007-09-14 18:15:46 · 4 answers · asked by Spanky 2 in Medicine

PHYSICS

2007-09-14 18:15:42 · 8 answers · asked by spict_7271 1 in Physics

Just a scary thought.What do you think?

2007-09-14 18:14:35 · 10 answers · asked by Life goes on... 6 in Paranormal Phenomena