Science & Mathematics - 13 July 2007

how i can making a simpel robot ?

2007-07-13 08:48:47 · 3 answers · asked by Anonymous in Engineering

electrons are flowing from -ve terminal to +ve terminal.... but we say the current flow is from positive to negative..can anybody explain me the logic?

2007-07-13 08:48:14 · 5 answers · asked by kuttan 3 in Engineering

I've got the monthly standard deviation for a portfolio of stocks and I need the yearly value. Is it 'statistically allowed' to just multiply the monthly value by 12? For example:
monthly standard deviation = 5,
hence, yearly standard deviation = 60.
If not, how can I get the yearly standard deviation from the monthly value?
(I cannot recalculate because I do not have the source data).

2007-07-13 08:47:31 · 6 answers · asked by Tal0 1 in Mathematics

I have an object which is 80 degrees centigrade, with the ambient air around it being 26.667 degrees centigrade, the air will be blown directly on the object at a tempureture of 21.111 degrees centigrade. Does anyone know approx. how many CFMs pumped in at those tempatures will be required to cool the 80 degrees centigrade down to approx. 60 degrees centigrade? Or does someone have a formula to figure it out? If you have a formula that is correct or gives a close aproximate but needs more info. I can fill in anything else just provide the formula please.

2007-07-13 08:47:05 · 5 answers · asked by socomsniperaj 2 in Engineering

Is an MRI anything like shock treatment? I mean is it as disruptive? Invasive?

2007-07-13 08:46:53 · 6 answers · asked by lauren10901 1 in Medicine

Factor completely:
1-s^4p^4

and solve usind the principle of zero..
r^2+9=6r

2007-07-13 08:43:09 · 7 answers · asked by Katrina R 1 in Mathematics

Come on it's gotta end somewhere...

2007-07-13 08:42:21 · 33 answers · asked by rach 3 in Astronomy & Space

2007-07-13 08:37:34 · 6 answers · asked by Anonymous in Astronomy & Space

The wiring is done so that the single phase power supply is just one of the 3 phases. Am i correct that this single phase/line is 3.3KVA ?? and, is ir possible to wire the 3 phases together to give me 10KVA (or higher than 3.3KVA) SINGLE phase power?? It seems that the welder is not getting enough power...??

2007-07-13 08:37:29 · 4 answers · asked by SMILEY 1 in Engineering

My answer never adds up to 14.74 when plugged in...

2007-07-13 08:36:31 · 6 answers · asked by Anonymous in Mathematics

Can you explain what this means, thanks G

2007-07-13 08:28:17 · 5 answers · asked by Anonymous in Chemistry

What is the difference between a AK-47 and a AK-74. Which Country manufactures these weapons. We are looking to the way the re-booting of the AK-74 makes the weapon preform.

2007-07-13 08:22:59 · 5 answers · asked by Shaun S 1 in Engineering

2007-07-13 08:21:46 · 8 answers · asked by Anonymous in Medicine

if sinh x = 3\2 find exact values for cosh x and tanh x

2007-07-13 08:16:34 · 2 answers · asked by Anonymous in Mathematics

v^5+4v^4f-60v^3f^2

and

16-w^4p^4

2007-07-13 08:15:33 · 6 answers · asked by Anonymous in Mathematics

I want to ask this in a neutral context and get some less biased answers than I have been getting. I guess there are two questions that I have here.

1. How do you view evolution, as a fact or as theory? In school, we're taught about evolution, but the way it's taught, it can be easy to assume it's fact. However, it still has holes in it, things that can't be explained, and it can't be proven completely true or false, so it's a theory. So, why is it taught in a way that we assume it is fact? (Note that I'm focusing on macroevolution here, microevolution is a different topic.)

2. Are there any legitimate theories out there right now about the origin of life? As far as I understand, there have been some proposed theories that have been rejected by the scientific community. I also know about the Miller experiment, but that was also rejected because it was skewed to create favorable results. Is there any theory out there right now that is considered plausible by scientists?

2007-07-13 08:12:00 · 18 answers · asked by Jason P 4 in Biology

2007-07-13 08:08:36 · 17 answers · asked by Anonymous in Medicine

Thank you

2007-07-13 08:03:26 · 7 answers · asked by JeususismyRock! 1 in Mathematics

90/21 + 98% of -98+_7y=155

Step by step directions

2007-07-13 08:00:04 · 4 answers · asked by Anonymous in Mathematics

(Taken from Cengel's book)
Would it be feasible to try to cool a house by compressing air, letting its temperature go down, using the compressed air to power a turbine and then discharging the cold air into the house?

2007-07-13 07:58:26 · 3 answers · asked by Nico 2 in Physics

the Apollo11 landing might have been a huge conspiracy!the landing would have made a huge crater from the engine-yet it didn't make a scratch!none of the pictures showed any stars AT ALL!!!!none of the pictures would have been able to survive the radioactivity!and one of the rocks in a picture had a prop number on it!!!also the american flag was waving in the wind-one problem-there is NO wind on the moon!!!!!!!what do you think and why?!?!?!?

2007-07-13 07:53:20 · 16 answers · asked by Anonymous in Astronomy & Space

2007-07-13 07:52:21 · 6 answers · asked by niki v 1 in Earth Sciences & Geology

I hope this isn't a dumb question. But I guess it could have been apart of another nation before. Like Alaska was part of Russia years and years ago.

2007-07-13 07:51:53 · 10 answers · asked by Anonymous in Geography

2007-07-13 07:47:51 · 3 answers · asked by Ryan A 1 in Mathematics

i tried and im finding that both equations work is that possible?

2007-07-13 07:45:42 · 5 answers · asked by lzhnyk 1 in Mathematics

did you all here that nasa said that a meator is heading to earth in 28 years.

2007-07-13 07:44:35 · 11 answers · asked by Jake Rosales 1 in Astronomy & Space

Please don't say that this is a stupid question or something becasue I jsut really want to know. Every night when I look out the window at about 10:30 I see the same star. I know it is the same one because it is the brightest one and it looks like the only one there. So like some days it goes to the right and then it's out of view (unless you go outside) and then it goes to the left until it goes out of view (again, unless you go outside) and then it goes to the right and then to the left and so on. I wondered, why does it do this? Just curious.

2007-07-13 07:41:32 · 11 answers · asked by Cooℓ Smιℓεys :D 5 in Astronomy & Space

I am in Columbus Ohio area.

2007-07-13 07:41:21 · 8 answers · asked by Louie S 1 in Astronomy & Space

Hello there, I have been doing a thing called enthalpy - I am good at it but there is a problem: I don't know how to do this one question!

"A polystyrene cup containes 50cm3 of water at 21.2*C.

2.53 g of of powdered ammonium chloride (NH4CL) was added and dissolved with stirring.

Calculate the lowest temperature which the solution should reach given that the enthalpy of solution of NH4CL is +15 KJ mol-1."

I know the answer is 17.8*C. BUT I don't know how to do the sum.

Can you help please help?

Just show me the how you worked it out.

2007-07-13 07:36:43 · 2 answers · asked by Anonymous in Chemistry

I am confused on the steps can u please help me. I am sure it is more simple then I am making it but I am terrible at math.

2007-07-13 07:36:36 · 8 answers · asked by Anonymous in Mathematics