Engineering - October 2007

wireless communication

2007-10-16 12:00:25 · 1 answers · asked by srs10 1

2007-10-16 11:45:03 · 3 answers · asked by chaazums 2

Where is it used? How does it work?

2007-10-16 11:37:48 · 2 answers · asked by Anonymous

Assuming that a electroMagnatic wave with frequancy f is traveling.

2007-10-16 11:09:29 · 5 answers · asked by JAMES 4

a. R-12
b. R-402
c. R-22
d. R-134a

2007-10-16 11:00:46 · 4 answers · asked by Narayan 3

Why is the main electrical feed for casino's average about 14,000 volts

2007-10-16 10:42:47 · 4 answers · asked by Craig C 1

I have to build a car, that travels between 5-10 in 45 seconds or less and stops whrever the judges tell it to, we wired an RC car to run in a strait line when you turn it on, w/o the remote, now for our breakign system we need a small second timer that could cut off the electricity to the motor, and stop the car on a dime, does anyone know of a "timer switch" small enoguh for an RC car?

2007-10-16 10:28:58 · 3 answers · asked by Tim 4

A jet is launched from an aircraft carrier wit the aid of its own engine and a steam-powered catapult. The thrust of its engines is 2.3 x 10^5 N. In being launched from rest it moves through a distance of 87 m and has a KE of 4.5 x 10^7 J at lift off. Waht is the work dsone on the jet by the catapult?

2007-10-16 09:58:06 · 1 answers · asked by smarin1987 2

2007-10-16 09:32:45 · 2 answers · asked by van c 1

I would like to know what is the relationship between octane rating and compression ratio.

What i know is that octane rating is a measure of anti detonation of a fuel. Diesel fuel have an octane rating of ~20 and its compression ratio is ~20:1. Gasoline however have an octane rating of ~80 and compression ratio of ~8:1.

So i would like to assume that lower octane rating will give high compression ratio.

ive got 2 question :

1) I dont understand when using an alcohol+gasoline(say e85,its octane rating is 105) fuel, the engines compression ratio should be ~14:1.
2) What happens in an e85 car when im not using the correct fuel percentage?say maybe 15% alcohol

2007-10-16 08:50:32 · 2 answers · asked by eddy1234 1

My submersible pump installed at a depth of 160' in a 4.5" borehole got stuck in mud during the last september rain.How to recover it .Pl.help m in recovering it?

2007-10-16 04:19:52 · 3 answers · asked by Yogi 1

is there cost effective way to store up the electricity or energy generated by a solar cell in the day and use it at night? can you explain it thanks

2007-10-16 04:11:35 · 3 answers · asked by mark 2

I know that certain forms of household and industrial waste can be recycled, paper, glass and aluminium for example.

Whilst I know that after a certain point recycling stops being an efficient use of resources. I was curious as to how far recycling could be taken as a technology.

For example, would it be more cost effective at some point in the future to mine rubbish dumps for the resources they contain as opposed to mining the raw matreials.

I'm not sure but I vaguely recollect something about "energy" used in recycling versus that used in refining and that at some point theres a trade-off between the two.

2007-10-16 03:40:51 · 5 answers · asked by shaithin 1

2007-10-16 03:36:57 · 1 answers · asked by Kenny 2

Can somebody give me feedback on the effects of these devices in the output voltage and eventually on the electrical equipment. I'm a little bit worried because these saving devices reduces the output voltage. In an electrical system like ours, the operating voltage is 220V. But once power is channelled to the device, sometimes voltage drops to 200V during peak hours.

2007-10-16 02:13:12 · 2 answers · asked by pacfan 1

2007-10-16 01:38:50 · 3 answers · asked by reza_hemmatdj 1

2007-10-16 00:36:58 · 3 answers · asked by mjpyork 1

does it exists?

2007-10-16 00:07:38 · 3 answers · asked by Chris 2

A lof insulation is a fibre roll that traps in heat inside the house.
PUHLEASE EXPLAIN WHY

2007-10-16 00:02:55 · 5 answers · asked by Anonymous

load impedance=20+j31-ohms

2007-10-15 23:44:59 · 1 answers · asked by Anonymous

what does YD11, yd11, yyo, YyoD1 etc actually mean

2007-10-15 23:44:48 · 1 answers · asked by Ovie 1

i have 2 straight lines

End coordinates for line 1:- (0,0) , (2,6.5)
End coordinates for line 2 :- (6.5,6.5) , (8.5,2)

at what point do these lines intercept?

2007-10-15 23:35:40 · 2 answers · asked by Glendon 1

The reason why i want to know is because depending on the answer i get, i may have an idea for a perpetual motion machine.............and i am complely serious.......

2007-10-15 18:45:34 · 6 answers · asked by Anthony P 1

This is the dream of many on earth. It is the dream spoken of in fables and myths. It is the dream shown only in the movies.

Will it be really possible for us to build a flying car? A flying car like the one seen in the movie Chitty Chitty Bang Bang?

2007-10-15 16:37:39 · 5 answers · asked by Forward 6

2007-10-15 12:44:30 · 1 answers · asked by Daylin G 1

Plz tell me and tell me why

2007-10-15 12:38:39 · 2 answers · asked by Anonymous

2007-10-15 11:28:28 · 1 answers · asked by spoon 1

Hey, just looking for some information or a website that will either support or diminish the theory that a aeroplane (namely a large airliner) will glide after the engin's have cut out? I;m not sure weather it will or not but jusrt my train of thought concludes that it should glide atleast reasonably? Any help to support this or demolish it would be great..
Thanks

2007-10-15 11:18:27 · 2 answers · asked by chinsta... 2

2007-10-15 10:00:47 · 3 answers · asked by Anonymous

Can we build a playground over an existing parking lot without tearing up the asphalt that is there? We will be using a dirt base with permalife pour and fill for impact absorption. Can anyone tell me if there is a need for the asphalt to be removed if it is covered in such a manner? This is a school build and will require inspection.

2007-10-15 09:54:31 · 3 answers · asked by nativeAZ 5