Engineering - October 2007

2007-10-26 02:19:45 · 6 answers · asked by lim bey 1

Describe two advantages and two disadvantages of plywood over solid timber.

2007-10-25 23:20:08 · 5 answers · asked by Mister 4

Example, the Reina Sofia Muzeum glass elevator, can it be used as fire safety lift?

2007-10-25 23:11:10 · 2 answers · asked by Mbs03 1

2007-10-25 23:08:26 · 10 answers · asked by Anonymous

2007-10-25 20:59:22 · 13 answers · asked by shy_lil_tasha 1

I am trying to figure out how long the circuit will last, but I know I cannot just figure I am using up 20mah, the resistor must be using up something. Is it a little, a lot? I am guessing it likely is a tiny overhead amount and calculating it wouldn't matter much?

I am actually running 14 LEDs and trying to determine how large a power source I need for it to run undiminished for 5 hours.

2007-10-25 18:32:30 · 5 answers · asked by star_surfer84 2

find a formula for the amount of force per unit area coming from wind blowing at a speed of S mph. as a result, supposing the cyclist has an exposed area of 0.5m^2 , find how much power in watts the cyclist must put out to maintain a speed of 10mph in to a head wind 10mph.

ok i got help from a tutor and he helped me derive this formula
P=Vb*.5*rho*Cw*Ac*Vw^2

where
p=power
rho= density of air=1.2kg/m^3
Cw coefficient of wind resistance=.78
A= frontal area=.5
Vw= wind velocity=4.469m/s^2
I don't know what Vb means in this eqn.

Putting units in this formula
P=(m^2/s^2)*.5*(kg/m^3)*.78*.5m^2*(m/s)

but the units don't make sense to me i should get watts which =(kgm^2/s^2) right?
Thanks for any help.

2007-10-25 16:50:17 · 1 answers · asked by ♡♥EM♡♥ 4

You probably remember this item. You pull on one steel ball from one side and let it drop. When it hits the other balls ii then causes one steel ball from the other side to go.

2007-10-25 15:59:14 · 10 answers · asked by Anonymous

Say I had four 12-volt lead-acid batteries connected in series as a battery pack.

Could I buy a 48-volt rated charging unit that would charge them all at the same time?

I have heard of issues with other battery chemistries where one battery happens to become under-charged in a series string (due to slight internal resistance differences, etc).

Would it be better to disassemble the pack and charge the batteries individually with an appropriate 12-volt charger?

Please advise. Thanks!

2007-10-25 15:29:02 · 3 answers · asked by Ubi 5

site: Boeing 747

2007-10-25 14:17:47 · 8 answers · asked by therainbowgiirl 2

The thing is, I want to keep the driven pulley to be less than 10 inches in diameter. If I use a second drive train, with another 3 inch pulley, what would the 2 driven pulleys be like?

2007-10-25 09:16:15 · 4 answers · asked by Blonde from D islands 2

2007-10-25 07:40:21 · 7 answers · asked by Anonymous

when the ice tends to insulate the coil from the air why the heating is decrease and what hapen inside the coiles and compressor please gave more information ?

2007-10-25 07:26:33 · 3 answers · asked by khalil c 1

2007-10-25 06:07:33 · 2 answers · asked by rdcolvin52 1

I was always told that microwaves work better to heat food with a higher moister content (Water). But recently I heard it is food with a high fat content that makes it heat the food better. The more fatty the food the better it heats. The latter makes no sense to me because you would not be able to heat a cup of water then. Anyone know the real answer?

2007-10-25 04:50:18 · 2 answers · asked by jennifer P 1

To determine the NortonEquivalent circuit for a circuit containing a voltge dependent current source, you can use which of the following techniques(maybe more then 1 ans)
A Find the TheveninEquivalent circuit and then use source transformation
B The Norton current is equal to the current through the load resistance connected between the terminals of interest, and the Norton equivalent resistance is equal to the load resistance
C The Norton current is equal to the dependent current source value, and the NortonEquivalent resistance can be found by zeroing all sources(independent and dependent) and using resistor combinations(series and parallel) to reduce the circuit to one equivalent resistance
D Place a short circuit between the terminals of interest and find the short circuit current, then zero all independent sources and determine the equivalent resistance of the circuit by applying a test voltage at the terminals of interest and solving for the current out of the test voltage source

2007-10-25 04:48:52 · 2 answers · asked by humphrad 1

2007-10-25 04:42:21 · 17 answers · asked by Anonymous

2007-10-25 03:22:14 · 3 answers · asked by li_showz 1

I want to build something ambitious, like a 2 man submarine or a helicopter. I decided the submarine is too dangerous and the helicopter might chop my head off. Putting the technical details and restrictions aside, what should I make?

2007-10-24 22:53:40 · 6 answers · asked by worried person 1

Can you explain to me if you have 4 light bulbs with ratings 60W, 75W, 100W and 120W in series, connected to a 120V battery, which light bulb will shine the brightest, and why.

THANK YOU SO MUCH IN ADVANCE!

Question from Physics 2.

2007-10-24 19:34:46 · 7 answers · asked by stackinchips11 2

Dear one,

I wish to calculate the power consumption in our home kindly let know how can i do that.

Thanks in advance

2007-10-24 19:00:05 · 1 answers · asked by Raja k 1

How Kilo watt apere to be converted in to Kilo watts? for all ( single ph / Two Ph / 3 Ph AC circuites).
Kindly provide equetions.

What is the Value of 1.42 in AC ?

2007-10-24 18:14:12 · 3 answers · asked by Ad_Rains. 1

This is to present a Seminar so detailed answer needed.

2007-10-24 18:10:36 · 3 answers · asked by Anonymous

This may be a silly question, but I have a problem with electronic breaking around me. I have gone through 7 dvd players, 5 cell phones, 3 computers.... the list goes on. WiFi doesn't work when i am in the room either. When I visit clients even their electronic go nuts.
What is going on here? Do our bodies put out different amounts of electricity? Even to the point of electronic going nuts around us? If this is the case have you ever heard of this? What do I do? Please help if you can.
(and no I am not breaking the electronic either =) ... )

2007-10-24 17:06:36 · 3 answers · asked by MerryBerry 2

2007-10-24 16:31:31 · 6 answers · asked by Nother one 1

A. 0 VAC C. 200 VAC
B. 120 VAC D. 120 VDC

2007-10-24 16:29:37 · 5 answers · asked by Nother one 1

if so What type and where do you go?

2007-10-24 12:59:35 · 5 answers · asked by ken M 2

I've built some robot's however, they can't move. I'm excellent at the mechanical and electrical side but I know nothing about programming. Which programming language is good to learn first?

2007-10-24 11:35:06 · 6 answers · asked by Sean D 2

Deflection and stresses in a beam can be determined through the use of a ______________.

a)chart b)torque analyzer

c)scale d)shear-moment diagram

2007-10-24 11:01:03 · 2 answers · asked by Anonymous

I've seen slope written as degrees - 5 degrees, or as a per cent - 3%. These two are supposed to be the same angle of incline. How are the degrees or percentage determined?

Für Elise – Support the Cancer & Heart Foundations

2007-10-24 10:38:37 · 4 answers · asked by Lil Bro 2