Science & Mathematics - 29 December 2007

2007-12-29 16:09:55 · 4 answers · asked by 1001001 2 in Botany

I'm to lazy to make my own charcoal.

2007-12-29 16:08:47 · 4 answers · asked by Trident White 3 in Chemistry

2007-12-29 16:03:17 · 3 answers · asked by Anonymous in Earth Sciences & Geology

If so, is it a bad thing? Is it wrong to dismiss some people out of hand for being apparently very stupid?

2007-12-29 15:57:53 · 5 answers · asked by Anonymous in Other - Science

I was looking for a more indepth explanation if rolling the tongue can be learned, even if you didn't genetically inherit it.

2007-12-29 15:57:00 · 4 answers · asked by kl90 1 in Biology

i am doing project on this ?so please help me friends?

i need what are the facilities available in CDMA?

2007-12-29 15:55:31 · 4 answers · asked by subha k 1 in Engineering

2007-12-29 15:50:39 · 6 answers · asked by carmel 215 1 in Mathematics

When Paul crossed the finish line of a 60 meter race he was ahead of Robert by 10 meters and ahead of Sam by 20 meters. Suppose Robert and Sam continue to race to the finish line without changing their rates of speed will Robert beat Sam?

2007-12-29 15:49:20 · 9 answers · asked by GF 1 in Mathematics

the limit as x---> infinity
of. root ((4x^2)-1)/ (x^2)

2007-12-29 15:48:57 · 4 answers · asked by ashlea o 2 in Mathematics

I seem to be confused.
I was told to use the chain rule, but I don't see how it can apply.
Can't I just substitute (cos x)(cos x) in its place and then use the product rule? Isn't cos^2 x = (cos x)(cos x)?

Please let me know if I am right. If not, then please explain how to use the chain rule in this situation. Thank you.

2007-12-29 15:45:39 · 6 answers · asked by belizeable 4 in Mathematics

2007-12-29 15:38:21 · 6 answers · asked by Chicken Little 3 in Physics

A(n) 646 kg elevator starts from rest. It moves
upward for 3.41 s with a constant acceleration
until it reaches its cruising speed of 1.86 m/s.
The acceleration of gravity is 9.8 m/s^2
Find the average power delivered by the
elevator motor during this period. Answer in
units of kW.

and

Wayne pulls a 407 N sled along a snowy path
using a rope that makes a 37 degree angle with the
ground. Wayne pulls with a force of 81.7 N.
The sled moves 26.1 m in 2.3 s.
What is Wayne's power? Answer in units
of W.

I got 5.887644 kW for the first question, and 709.6280791 W for the second question, but both were wrong.
Could someone help me with these two questions? i would like work and an answer please, thanks :)

2007-12-29 15:38:13 · 3 answers · asked by thundershock375 2 in Physics

I'm trying to make hot ice for a science experiment and i cant find where to buy it please help. :)

2007-12-29 15:28:58 · 1 answers · asked by aznbluet 2 in Chemistry

How many ways can six pins be arranged around a circular hat band?

Use mathematical induction to prove that 1^2+2^2+3^2+...+n^2=n(n+1)(2n+1_/6 for all positive integral values of n.

Express 23+29+35+42+47 using sigma notation.

2007-12-29 15:24:54 · 4 answers · asked by Nubia S 1 in Mathematics

Sitting @ an intersection this morning I noticed at least 60-70 pidgeons sitting side by side on a hydro wire all facing the same way.
Later on in the afternoon, same intersection the same birds were sitting side by side only this time facing a different direction!
Is there a reason for this?

2007-12-29 15:24:22 · 7 answers · asked by Anonymous in Zoology

How do the scientists do it. How do they know the magnetic poles of other planets, and how do they make maps of it. On earth it is simple for us.

2007-12-29 15:21:26 · 3 answers · asked by Fantail Flycatcher 3 in Astronomy & Space

that i can set to a light that turns on when that beam is broken and remember a straight beam that detects nothing but something or someone breaks that beam?

2007-12-29 15:19:18 · 2 answers · asked by Anonymous in Engineering

The universe is a large place, I don't see how Earth is the only place where living things are found.

2007-12-29 15:19:04 · 11 answers · asked by Anonymous in Earth Sciences & Geology

I have always heard that it was usually around the late fall when we get a moderate to light frost.

2007-12-29 15:15:56 · 6 answers · asked by Betty S 1 in Weather

2007-12-29 15:09:52 · 8 answers · asked by Anonymous in Physics

2007-12-29 15:06:06 · 6 answers · asked by doggone2crazy 2 in Earth Sciences & Geology

anthoney's family spent 77.50 on the party. if there were 20 guest at the party about how much money did they spend on each guest?

2007-12-29 15:05:26 · 9 answers · asked by Desmond R 1 in Mathematics

Maybe a more common animal?
Thank you(:

2007-12-29 15:04:04 · 9 answers · asked by Anonymous in Zoology

ok there is a really hard question that im trying to solve and i need ur help it is:

1/sqrt3 + sqrt3

guys plz show ur full working thx

2007-12-29 14:56:36 · 4 answers · asked by Anonymous in Mathematics

2007-12-29 14:55:41 · 5 answers · asked by Sasha ♥ 5 in Biology

Solve the system by addition. x + y = 4 –x + y = 2

2007-12-29 14:52:39 · 2 answers · asked by cutter1890 1 in Mathematics

Why do Christians always say Evolution didn't take place because their bible says it didn't? What about the other religions in the world? What about all of the evidence for Evolution? Why do they decide to throw blind faith into a book that is supposedly the word of "God", when there is no proof that god even exists?

2007-12-29 14:51:08 · 5 answers · asked by fshklr1 3 in Biology

2007-12-29 14:46:56 · 9 answers · asked by Dare to ask? 3 in Earth Sciences & Geology

2007-12-29 14:42:39 · 4 answers · asked by mevin217 1 in Chemistry

I need answers back by full scientific research please, I think people have lied to me about the weather in the past.

2007-12-29 14:41:16 · 4 answers · asked by Anonymous in Weather