Science & Mathematics - 12 September 2007

2007-09-12 20:31:19 · 6 answers · asked by Joe Teh 1 in Zoology

a liquid from the sheer force of going that fast?

2007-09-12 20:28:17 · 7 answers · asked by Anonymous in Astronomy & Space

besides crickets, i hear this sound that is very irrating, like two marbles rubbing together? does anyone know what kind of bug it might be? i think its in my house. I'm kind of scared, should I be worried?

2007-09-12 20:26:30 · 2 answers · asked by lillyflowerr 3 in Zoology

<0,0,0,1><0,0,2,1><0,3,2,1><0,1,-1,1> I know these vector are linearly dependent but I cannot find the solution to
w=0 2z+w=0 3y+2z+w=0 y-w+z=0 other than w=x=y=z=0.

2007-09-12 20:23:55 · 2 answers · asked by Hungton L 1 in Mathematics

2007-09-12 20:21:50 · 4 answers · asked by ? 3 in Mathematics

Can someone help me with this revision question before i do my exam?

I only need pretty basic answers no more than a paragraph.

2007-09-12 20:11:10 · 1 answers · asked by Anonymous in Physics

2007-09-12 19:58:59 · 1 answers · asked by davidrutoh 1 in Medicine

2007-09-12 19:57:21 · 10 answers · asked by Anonymous in Mathematics

By how much does the speed of a vehicle moving in a straight line change each second when it is acceleration at 2 km/h.s? At 4 km/h.s? at 10km/h.s?

2007-09-12 19:54:14 · 2 answers · asked by cocomademoiselle 5 in Physics

A student who weighs 530 N is wearing a backpack that weighs 84 N. The student is standing still on level ground. Give your answers to the following questions in Newtons.
a) What is the magnitude of the net force on the student?
b)What is the magnitude of the contact force on the student by the backpack?
c) What is the magnitude of the contact force on the student by the ground?

2007-09-12 19:47:26 · 4 answers · asked by ariddlegirl 1 in Physics

Are there any decent theories as to how early humans discovered how to make bronze or iron. It seems a bit far-fetched to suggest that someone could have accidently dropped a rock containing metal ores into a fire and hey presto, Iron! Can I have your serious theories please.

2007-09-12 19:41:56 · 10 answers · asked by soppy.bollocks 4 in Earth Sciences & Geology

A. Midnight
B. Noon
C. 3 PM
D. 6 AM
E. 6 PM

2007-09-12 19:33:52 · 3 answers · asked by fundamentalz27 1 in Astronomy & Space

2007-09-12 19:26:52 · 9 answers · asked by John C 1 in Astronomy & Space

The graph of , is reflected in the x axis and shifted to the left 3 units and up 4 units. What is the equation of the new graph?

2007-09-12 19:22:30 · 1 answers · asked by yourdaddy 2 in Physics

The chemicals used in my lab were:
- Aluminum metal
- Potasssium Hydroxide
- Sulfuric acid


A guy I know guessed and said: The slow cool lets the molecules move faster, which increases the likelihood of bonds but the ice bath would slow them down much more, meaning there is less of a chance of bonds.


But people on Yahoo Answers said that...

"Usually things dissolve much easier in warm water. Crystals should form more rapidly in an ice bath because they are more supersaturated. Rapid moving around is not necessarily conducive to crystal formation. "

" Ice bath. Crystallization is faster lower the temperature. "

"They'll form faster under an ice bath if you think about it...crystals are essentially solids...when water freeze into ice and ice is crystal lattices this is what is occurring with other crystal formations."

2007-09-12 19:16:43 · 5 answers · asked by Anonymous in Chemistry

What are some things you can measure? What units (labels) would you use for each?

2007-09-12 19:14:38 · 10 answers · asked by Sarah S 3 in Mathematics

A. Midnight
B. Noon
C. 3 PM
D. 6 AM
E. 6 PM

2007-09-12 19:12:02 · 4 answers · asked by fundamentalz27 1 in Astronomy & Space

2007-09-12 19:10:18 · 2 answers · asked by amber w 1 in Chemistry

2007-09-12 19:04:27 · 3 answers · asked by beeehhh 1 in Biology

Compare the # of atoms present in 10.0 gram samples of water and sodium chloride

also, if you can/want,

Determine the mass of O2(g) required to completely combust with 10.0g CH4(g).
[2 and 4 are subscripts]

I am brand new to Chem this year and well, im not exactly sure what to do/look for
thanks for any help!
explanations are always nice, im really not here just to "get an answer and leave," i want to be able to understand it

2007-09-12 19:02:21 · 2 answers · asked by *mouse* 3 in Chemistry

2007-09-12 19:00:35 · 2 answers · asked by H 2 in Astronomy & Space

2007-09-12 18:54:33 · 7 answers · asked by Bill W 【ツ】 6 in Mathematics

what is the viscosity of 20 % salt solution in water?

2007-09-12 18:45:50 · 3 answers · asked by carlovski 1 in Chemistry

What are some opinions on EVP's (electronic voice phenomena)? If you are skeptic, why? How do you explain the voices caught on tape in an empty room?

2007-09-12 18:44:34 · 9 answers · asked by drjtdinh 2 in Paranormal Phenomena

Also, Calculate the number of H- in 1.127 g CaH2.


I'll appreciate any help

2007-09-12 18:39:39 · 3 answers · asked by Anonymous in Chemistry

I know it's calcuim carbonate, but when the calcium is with the hydrochloric acid, is there a colour change? Thanks.

2007-09-12 18:38:22 · 2 answers · asked by Anonymous in Chemistry

2007-09-12 18:29:10 · 4 answers · asked by Anonymous in Chemistry

Here's how it would work: the space station would be situated near an artificial dam with special flow-through ports at its base. The shuttle would rest upon the rim of what looks like a huge wheel. When it's time to launch, the flow-through vents at the bottom of the dam are opened, and the water causes the wheel to spin. The wheel continuesto spin faster and faster until escape velocity is either almost reached, reached or exceeded, at which point the shuttle is flung from the wheel, utilizing perhaps a small amount of rocket fuel to assist in the ascent. The wheel would be balanced by weights, of course, the weight opposite the shuttle being detached at the same time as the shuttle itself.

Even remotely feasible?

2007-09-12 18:21:30 · 5 answers · asked by uncleclover 5 in Engineering

if u v and w are vectors that are linearly independent will u-v v-w and u-w be linearly independent?

2007-09-12 18:18:12 · 5 answers · asked by Hungton L 1 in Mathematics

2007-09-12 18:18:05 · 2 answers · asked by chrischris1976 1 in Earth Sciences & Geology