Science & Mathematics - 15 October 2006

2006-10-15 05:18:04 · 6 answers · asked by stonecoldsteev 1 in Chemistry

I've put copper wire in the fire of a bunsen burner until it is black and glows red. When I take it out and scrape it, the red and black returns to the original copper colour. Do you know what type of chemical reaction this is? (double displacement, single displacement, synthesis, or decomposition)

2006-10-15 05:14:53 · 4 answers · asked by Sweetbait 3 in Chemistry

The distance, d (in meters), travelled by a falling object is given by the equation d=4.9t^2, where t i the time in seconds. From what height was the object originally dropped if it took 4.24 seconds to hit the ground? Round answers to the nearest whole number.

2006-10-15 05:11:05 · 6 answers · asked by Anonymous in Mathematics

2006-10-15 05:08:23 · 14 answers · asked by Roger 1 in Astronomy & Space

I have the answer but I don't know how to solve the question.

2006-10-15 05:05:22 · 5 answers · asked by shadab a 2 in Physics

then, choose the correct option-
(a) the hollow sphere reaches the bottom first
(b) the solid sphere reaches the bottom with greater speed
(c) the solid sphere reaches the bottom with greater kinetic energy
(d) the 2 spheres will reach the bottom with the same linear momentum.

the correct answer, according to my book, is (b) option......can u explain why....? feel free to use torque, moment of inertia, etc etc....in ur explanation......

2006-10-15 05:02:52 · 6 answers · asked by Anonymous in Physics

a gas has a volume of 10 L at 50degrees C and 200 mm Hg pressure. What correction factor is needed to give a volume at STP?

i dont know how to approach this. I dont understand what the correction factor is.
it uses the van der waals equation, which is
[P+a(n/V)^2]* (V-nb)=nRT
its a variation of the ideal gas law but idk what to do!
any help is greatly appreciated.
THANKS! :)

2006-10-15 05:02:10 · 4 answers · asked by Anonymous in Chemistry

lim f(x(sub 0)+h)-f(x(sub 0))/h
h-->0

f(x)=3x^2
x(sub 0)=1

Thanks.

2006-10-15 04:59:46 · 3 answers · asked by big_j_gizzy 4 in Mathematics

thanks for the help....

2006-10-15 04:58:06 · 2 answers · asked by ryboyin 4 in Chemistry

They say speed of light is the fastest velocity know to man. Now if you are ridding in the back of a train thats traveling at the speed of light and decide to walk to the front of the train, doesn't that make you faster than the speed of light? Just wondering.

2006-10-15 04:57:01 · 10 answers · asked by groser_hahn 1 in Other - Science

Just imagine in approximately 20-30 years time cloning becomes legal. Would you clone yourself for any reason.

2006-10-15 04:56:42 · 17 answers · asked by Ahmed M 2 in Biology

a)Astrophysics, astronomers and nuclear physics’: light, mid atomic waves caused by the electrons’ ups and downs inside the atom
b)Tarcísio Brito’s (self-taught scientist): Grand Atom (Universe) divided into three powers: Protons, Electrons and Neutrons. The sun contains the positive power (Protons), but with negative feedback (Electrons) and the Interstellar System contains the negative power (Electrons), but with positive feedback (Protons). Planet Earth is responsible for the Neutrons, acting in order to unbalance positive and negative powers in its limits. Therefore, neutralizes beginning and end. And so energies come from the place where they go to, and go to the place where they came from.

2006-10-15 04:52:56 · 1 answers · asked by britotarcisio 6 in Astronomy & Space

if this is true ,what implications does this have for mankind,is he wrong to bring this information to the global public attention

2006-10-15 04:52:34 · 2 answers · asked by gasp 4 in Other - Science

2006-10-15 04:52:23 · 5 answers · asked by janecull2003 1 in Medicine

IN this multi step equation I cannot figure it out, because the variables are on the outside for some reason.

5y-10=14-3y

2006-10-15 04:48:17 · 11 answers · asked by Captain705 1 in Mathematics

2006-10-15 04:48:08 · 11 answers · asked by Braniac 1 in Astronomy & Space

2006-10-15 04:47:31 · 2 answers · asked by Ijsselor 1 in Chemistry

Some insect behaviors are rather complex, are they learned or instinctive? Do insects act and react instinctively, or are they capable of thought? About what time during their evolutionary development did complex behaviors develop? Are insect behaviors continuing to evolve, or to develop? Are insects evolving in this age--any examples? Thanks for any information.

2006-10-15 04:42:42 · 3 answers · asked by jxt299 7 in Zoology

6th grade science

2006-10-15 04:42:29 · 4 answers · asked by Bill 1 in Biology

E answers as you differentiate the Sun that emits light, heat and waves of radio… Of the Stars that emit brightness and microwaves of low temperatures

2006-10-15 04:36:39 · 2 answers · asked by britotarcisio 6 in Astronomy & Space

can she have it injected into her? its a serious question. ahe has bad stomach pains when she eats and has pain when she doesnt eat and gets pains when she has tablets and has lots of water too. any suggestions? doc gave her iron injections after sooooo many yrs of puasuading and they made her feel better but he said teh course of 12 have finished during a period of 4 mnths so wont give her any now. she isnt well again now. why he being so mean? my family are going through alot with him as a doctor. had enough. what other alternatives can she have?

2006-10-15 04:35:29 · 19 answers · asked by allgiggles1984 6 in Medicine

For example, a soccer ball and a tennis ball and a marble were all launched at 12.8m/s horizontally. How come the trajectory of the projectile is the same for all these objects?

2006-10-15 04:27:17 · 8 answers · asked by Rhodri 1 in Physics

2006-10-15 04:26:20 · 3 answers · asked by Anonymous in Biology

My questions;

1. the term "caucasian" comes from the regions of Cocasus. It is a modern days' Russia, Ukraine, etc. Does it mean that the people from Africa traveled to Mid-east, then Cocasus and settled on Western Europe?

2. if then, what does it mean by "Indo-Europe" language? what does India have to do with the Europeans?

3. how did human kinds traveled and spread the civilization? I know the first human appeared on earth is from Africa. Did they travel (spread) to many regions in the world? Where did they arrive first? Did they arrive first in India and then went north west toward to Cacasus?

I want to know, how the human ancestors traveled.

4. so called the "asians", especially the chinese, koreans and japanese have Mongolian heritage. Then the Mongolians are actually the "caucasians" traveled to Asia and settled later?

thank you.

2006-10-15 04:25:23 · 2 answers · asked by davegesprek 1 in Other - Science

2006-10-15 04:24:08 · 24 answers · asked by buji ph 1 in Medicine

2006-10-15 04:22:49 · 12 answers · asked by inamulhaq_siddiqui 1 in Medicine

Hi everyone who took the time to read my question thanks in advance. I'm trying to find studies or any article that deals with prenatal vitamins. I'm also trying to find anything on insufficient vitamin E during pregnancy can increase a child's risk of developing asthma or article that says otherwise. If you do can you please tell me. And one more thing the source must be validated.
Thank You. if you want to email me anything my email address is Trinbagonian4life@yahoo.com

2006-10-15 04:20:49 · 3 answers · asked by Darcel 1 in Medicine

2006-10-15 04:17:00 · 3 answers · asked by Anonymous in Physics

2006-10-15 04:15:12 · 4 answers · asked by Anonymous in Physics

a strain of bacteria doubles in each 20 days. 2 of these are placed on a spaceship & sent away from earth for 1000 earth days.during this time, the speed of ship was 0.9950c. how many bacteria would be aboard when ship lands on earth ? i)128 ii)64 iii)56 iv)28

2006-10-15 04:12:56 · 1 answers · asked by vaishali 2 in Biology