Science & Mathematics - 14 December 2007

the mass of 1 litre of oxygen =1.4g how many litres of oxygen is given up at the combustion of 21g of magnesiumwhich has an equivalent of 0,5 mols.

2007-12-14 08:05:53 · 2 answers · asked by jammal hines 1 in Chemistry

Would an upside down conical shaped vessel heat faster than a cylindrical one?

Taking into consideration that heat rises and that the water is being heat from the bottom of the vessel.

All being the same, including volume of water and surface area of vessel and of course the size of heating element. Also assuming that heat loss is the same.

I'm pretty convinced that the conical shape would allow a quicker boil due to a more intensive heat lower down and the rising of the hotter water.

2007-12-14 08:04:59 · 4 answers · asked by britishbuddha 2 in Physics

2007-12-14 08:03:17 · 3 answers · asked by missy_kat_lover 1 in Astronomy & Space

2007-12-14 08:00:42 · 21 answers · asked by Anonymous in Botany

2007-12-14 08:00:05 · 6 answers · asked by Sunnymorning 2 in Other - Science

q:1:-the weapon's injuries considered of what type??
q:2:-a-when does the same bullet have two entery and two exit?
b-when does it have two entery and one exit ??
c-and when does it have one entery and two exit??

2007-12-14 07:59:26 · 2 answers · asked by Anonymous in Medicine

Assuming God is real, is it possible for Him to exist in an unknown dimension?

2007-12-14 07:56:41 · 2 answers · asked by Anonymous in Physics

Analyze the roots of the polynomial P(x) = x^4 + 3x^3 - 5x^2 + 2x – 4

a. Tell how many possible positive rational roots.

b. Tell how many possible negative rational roots.

c. Tell how many possible complex roots.

2007-12-14 07:55:21 · 3 answers · asked by Anonymous in Mathematics

a.im sick of seeing these kids asking for help in this site
b.there's nothing wrong helping these poor kids.
c.Their should be some restrictions on these kids,they should start finding things on their own rather than asking questions related to their homework here

2007-12-14 07:54:42 · 22 answers · asked by shammi_f1 2 in Other - Science

2007-12-14 07:50:22 · 9 answers · asked by ṡhαḋøώḋυṡτ ღ вιттєя ѕωєєт ღ 6 in Weather

2007-12-14 07:44:57 · 20 answers · asked by ṡhαḋøώḋυṡτ ღ вιттєя ѕωєєт ღ 6 in Chemistry

2007-12-14 07:44:06 · 7 answers · asked by ṡhαḋøώḋυṡτ ღ вιттєя ѕωєєт ღ 6 in Zoology

2007-12-14 07:37:02 · 7 answers · asked by Shan F 2 in Astronomy & Space

Hi, im having some touble with this trig question and was just wondering if i could get some help with it, any help would be great the question is
prove: sinx-tanx = sinxtanx

~ Thnx

2007-12-14 07:36:42 · 6 answers · asked by Anonymous in Mathematics

2007-12-14 07:36:16 · 7 answers · asked by Shan F 2 in Earth Sciences & Geology

Why do shadows always fall north along an East-West line? At least in the Northern Hemisphere. Would shadows fall south in the Southern Hemisphere? In what situation would a shadow fall south in the northern hemisphere??

2007-12-14 07:33:58 · 5 answers · asked by jiggly_puff_59 1 in Physics

If I stop salt, sugar, alchohol, and excercise regularly, how quickly can blood pressure drop? how quickly can results be seen? Obviously there are some variables, but in general. (Or what are the variables)

2007-12-14 07:29:31 · 5 answers · asked by urrrp 6 in Medicine

There are N=10e10 identical stars in a galaxy, mass of each star is M=10e30kg and rms velocity of stars is V=100 km/s.

How much energy is needed to disassemble the galaxy and scatter the stars (but not disasseble the stars themselves)?

2007-12-14 07:22:09 · 10 answers · asked by Alexander 6 in Physics

A man in an elevator goes down at a fixed speed.
Does his mass's wheight increase, or decrease compared to when he stands still on the ground?

2007-12-14 07:17:46 · 4 answers · asked by ProDigit 3 in Physics

Is it hard?

What can I expect?

How do I pass this puppy with grace and style?

Thanks

2007-12-14 07:17:09 · 7 answers · asked by Anonymous in Biology

2007-12-14 07:15:56 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Would an upside down conical shaped vessel heat faster than a cylindrical one?

Taking into consideration that heat rises and that the water is being heat from the bottom of the vessel.

What do you think? Also, please state your reasons and source if possible.

2007-12-14 07:14:59 · 7 answers · asked by britishbuddha 2 in Chemistry

If we use any less we will be lighting sodding candles

2007-12-14 07:11:49 · 4 answers · asked by mally 2 in Earth Sciences & Geology

2007-12-14 07:05:43 · 6 answers · asked by Anonymous in Mathematics

my worries come from weed exposure. I always cover my mouth or try not to breath it in and its not like a ton of smoke is coming my way either. im just paranoid. can small amounts of exposure to marijuana smoke make me fail my drug test?

2007-12-14 07:04:46 · 4 answers · asked by Anonymous in Medicine

2007-12-14 06:58:45 · 7 answers · asked by Anonymous in Zoology

I know that the moon regulates the tides of our oceans, but would there be any other impact on the earth if the moon was destroyed by an asteroid say? Do we need a tide or could we live without it? I guess that's 2 questions!

2007-12-14 06:54:27 · 12 answers · asked by Adam B 2 in Astronomy & Space

What are their names? Thanks.

2007-12-14 06:53:30 · 10 answers · asked by fslcaptain737 4 in Astronomy & Space

And for how long?

2007-12-14 06:47:56 · 8 answers · asked by urrrp 6 in Medicine

2007-12-14 06:42:21 · 9 answers · asked by twmsioncati 2 in Astronomy & Space