Engineering - November 2007

2007-11-26 11:36:30 · 4 answers · asked by Anonymous

I need the equation in differential form for steady state molecular diffusion of a fluid in a laminar flow. I am looking for an equation that will work for Reynold's Number 35. Also is it possible to derive it from Ficks law of mass transfer?

2007-11-26 11:23:53 · 2 answers · asked by Anonymous

I want to control the amount of volts i am using for my science fair...for example if I want a constant 45 volts how would I do that? is there A device I can conect to like 6 9volt batteries that would allow a constant output of 45 volts? please include the names of any devices and the websites where they can be found....thx

2007-11-26 11:12:56 · 9 answers · asked by Anonymous

Should I use the paper towels one at a time or should I use them together, say, one behind the other?

2007-11-26 09:28:41 · 19 answers · asked by Anonymous

can i make or buy a propeller ( i mean a good sized one that is like 4 or 5 feet in length) and a small engine to make it spin for under 300 dollars, i want informative answers, dont give me critiqes or your B. S. suggestions would be nice 2

2007-11-26 09:22:34 · 3 answers · asked by Philippe S 2

I know heat from steam and whatnot can be changed to electricity, but is it possible to change the heat from the atmosphere to electricity?

2007-11-26 09:21:34 · 3 answers · asked by Hans 1

2007-11-26 09:12:13 · 2 answers · asked by Anonymous

2007-11-26 09:00:23 · 4 answers · asked by parkhurst6 1

I am doing this for my science fair project and i would like to know which of these are better remembered

2007-11-26 07:14:34 · 3 answers · asked by Anonymous

can anyone tell me how to contact a company that can send me a kit with complete guide of building the aircraft.??
or on the net how i can find anything about how i can build homemade aircraft??

please i am serious and i need it for my project in the university coz i am studying aviation engineering.

thanks in advance!

2007-11-26 06:32:51 · 6 answers · asked by a_afani87 1

Air conditioner problem... Freon R-22
Determine the actual cooling rate of the unit.
Calculate the rate of heat loss from the air.

-----Pressure (psig)----Temperature (F) ---- Enthalpy (Btu/lbm)
A -- 170 ---------------------- 88 -------------------- 36.345
B -- 113 ---------------------- 64 -------------------- 123.642
C -- 66 ------------------------ 57 -------------------- 110.9135
D -- 172 ---------------------- 150 ------------------ 123.6425

0.4 gallons per minute
Air inlet = 75.7F
Air Outlet = 44F
Average velocity = 1000fpm
Area = 0.47ft2

Given Equations
Qdot = m22dot (hc - hb)
ŋ = Qair / Q22
Q = mdotCpΔT

I have a few equations given, but not sure where to look for the values... for example Qdot = mdot (hc-hb)... how do I find mdot?

2007-11-26 05:59:04 · 2 answers · asked by Anonymous

can someone solve this for me??
"with a very easy detailed solution and instruction,."

dx + xlnx lny dy=0

it say find the general formula??
Variable separable LED??

pleas solve it as soon as possible, i need it in 3 and half hours,.



if you type it with microsoft word, you can send this to me at

jeff8505@yahoo.com
or
my_dark_sidejet@yahoo.com.ph

thank you very much you will going to save my life if you can help me,.

2007-11-26 00:24:39 · 1 answers · asked by Anonymous

The smoke was coming from the vent area where the light bulb is. I immediately unplugged the microwave and the smoke stopped but I'm wondering if the microwave is a potential hazard and if I should put it outside in case it decides to catch on fire in the middle of my sleep tonight? I live in an apartment and I was thinking of putting it out on the balcony to protect me and my cat. Should I do anything else, call the fire department and have them take it?

2007-11-25 17:49:36 · 5 answers · asked by Kathy1 1

2007-11-25 17:05:07 · 6 answers · asked by David Junior 3

2007-11-25 16:52:58 · 4 answers · asked by oscar z 1

2007-11-25 14:41:55 · 3 answers · asked by Charles T 1

2007-11-25 10:13:17 · 5 answers · asked by Oca 3

i need to know this because my science project is due tomorro and i choose a alarm system as my project....i had a way to do it but i left the book with the instuctions in school! plz i need help its due tomorro!!!!!

2007-11-25 10:01:35 · 2 answers · asked by Anonymous

How much electricity (in kilowatt hours) does it take to produce one ton of aluminum, not counting the energy required to keep the furnace hot?

2007-11-25 09:32:09 · 2 answers · asked by JitterBug589 3

im going to use a 9 volt battery and attach two electrical wires to the two sides and attach those to two nails.will this work as impressed current?

2007-11-25 09:21:38 · 2 answers · asked by Speeding D 4

i need to write a 2 pg. report on passive solar houses and i dont know what it is and when i research it, it doesnt give me what i need. so what is passive solar in your own words?

2007-11-25 08:21:04 · 2 answers · asked by Blondie 1

2007-11-25 08:10:59 · 2 answers · asked by Anonymous

I have a project due in a few days. I have to make a time machine. WE just finished reading the book by hg wells.
This is not gonna be used for "time travel" cause we all know its impossible.
I just need ideas on hwo to make one.

2007-11-25 05:53:18 · 4 answers · asked by nicolee 1

are there different kinds of threads for a CO2, N2O, He, etc tank? or can you fill any tank with any gas

2007-11-25 05:44:58 · 4 answers · asked by Anonymous

What are the ripples?

2007-11-25 04:59:15 · 4 answers · asked by David Junior 3

2007-11-25 03:30:39 · 7 answers · asked by chinese_helicopter 2

2007-11-25 02:57:58 · 6 answers · asked by chinese_helicopter 2

science homework: how does a helicopter work, please help

2007-11-25 01:53:17 · 2 answers · asked by Anonymous

I know a cd player contains a laser and a reciever to detect the reflected light and i was wondering if there was any way of making a simple light sensor from it.

thankyou

2007-11-24 20:57:52 · 2 answers · asked by Libra 1

Particularly differential, operational , electrometer and carrier amplifiers. plss. i badly need these info. thanks so much for help. =)

2007-11-24 20:44:30 · 1 answers · asked by dangeogeof 1