Engineering - September 2007

can anyone please help me think of a p[roblem so tt i can find solution coz i nid to make an invention ps mus be sth tt can be solve by invention

2007-09-08 00:28:28 · 2 answers · asked by RuN oF dEaTh 1

2007-09-08 00:02:22 · 3 answers · asked by ali m 2

2007-09-07 19:56:43 · 3 answers · asked by gangster 1

1. what is the difference b/w floating load and grounded load

2.why op-amp has a saturation value of output voltage...im mean i would like to know the theory of this phenomenon

2007-09-07 19:14:21 · 3 answers · asked by Anonymous

such problems are like barriers and can be solve with an invetion which have noit been invented. ideas must be original and creativity. kindly give me an answer asap in need thanks

2007-09-07 15:32:52 · 3 answers · asked by RuN oF dEaTh 1

calculate the power in watts that must be supplied to a 40-gallon electric water heater to raise the temperature of a tank of water from 50 degrees to 150 degrees in 2 hours. assume that no heat is wasted.( 1 gallo= 8 1/3 pounds) calculate the cost of heating the water at $0.04 per kilo watt per hour?

thanks and can you show me a solution too
again thanks a lot.

2007-09-07 12:42:14 · 1 answers · asked by nic 5

A battery-powered light bulb has a tungsten filament. Immediately after the switch connecting the bulb to the battery is turned on and the temperature of the bulb is still 20 degrees C, the current in the bulb is 0.860 A. After the bulb has warmed up to its operating temperature the current is 0.220 A.
What is the operating temperature of the filament?

Where do I go with this? Do I need the resistance of tungsten at 20 deg C (5.25x10^-8 ohm*meter)? Is there a simple formula or ratio I'm missing?

2007-09-07 11:29:51 · 2 answers · asked by kev0709 2

Hello
I was about to solder several 2N2907 and 2N304 transistors to a PCB, but I was surprised to see the instructions for the kit I was assembling made no recommendation for the use of heat sinks. Can I safely solder these transistors onto the board without frying them, without the use of some sort of heat sink?

2007-09-07 11:19:12 · 9 answers · asked by tom h 3

I was looking at Google Earth in Nevada (south of where my sister, brother-in-law, neices, cousins live) and saw what looks like HUNDREDS of test craters and even more underground sites. What were we learning? Nearly all of these gave off radioactive clouds, which drifted as far as the Mississippi...

2007-09-07 11:02:29 · 24 answers · asked by Faesson 7

2007-09-07 10:33:04 · 5 answers · asked by Anonymous

2007-09-07 10:02:24 · 1 answers · asked by Mostafa S 1

I have always wanted to go into engineering but my undergraduate is in an unrelated field. Has anyone ever started their engineering career at the Master's degree level? Or is it necessary to obtain an undergraduate degree?

2007-09-07 09:51:48 · 3 answers · asked by Anonymous

I've always wanted to know this. Everybody I've asked (and they're all smart) says math is such an important part in this, but I've rarely found anything having to do with math in this.

Plus, I'm already looking into my career path, and this has been given to me as a possibility. I'm a very good math and science student. And I like roller coasters. So yeah.

2007-09-07 09:43:53 · 9 answers · asked by Anonymous

Seemed simple enough, but I'm getting a really big number:

"The noise produced by a resistor is to be amplified by a noiseless amplifier having a voltage gain of 75 and a bandwidth of 100kHz. A sensitive meter at the output reads 240 uV rms. Assuming operation at 37 C, calculate the resistor's resistance."

So I used this equation: en (noise voltage) = sqrt ( 4kT * delta f*R)

Using that, I had:
240 x 10^-6 = sqrt ( 4 * 310 K * (1.38 x 10^-23 J/K)*(100 x 10^3)*R)

When I solved for R, I got an answer of 3.3661 x 10^7 ohms, which is wayyy more than the given answer of 5.985k ohms. Does anyone know what I did wrong? Thanks!

2007-09-07 08:58:57 · 2 answers · asked by Galbadian 2

2007-09-07 08:22:52 · 3 answers · asked by moh 1

We are wanting to install two thousand pounds of equiptment on our commercial roof.The roof is very thin,tar and gravel type,with joist at 60 inches.

2007-09-07 07:52:36 · 3 answers · asked by Anonymous

2007-09-07 07:46:13 · 2 answers · asked by jenejam1996 2

Is there any device for finding out any kind of fault in an electricity line of 11000 kva?

2007-09-07 07:22:49 · 3 answers · asked by Anonymous

I think he invented transformer (ac - dc) but not credited.

2007-09-07 07:15:43 · 11 answers · asked by Astarte 1

2007-09-07 07:00:47 · 1 answers · asked by Anonymous

How does the regenerator works. does it store the energy or some how reused the unused energy? if yes how...

2007-09-07 06:42:43 · 3 answers · asked by Nehemiah L 1

can you give me examples so its easy to picture em'?

2007-09-07 06:07:36 · 3 answers · asked by shanekeavy 5

jismondev

2007-09-07 05:08:37 · 3 answers · asked by jismondev 1

2007-09-07 05:05:29 · 4 answers · asked by Riaz J 1

2007-09-07 05:01:41 · 5 answers · asked by Dan D 1

2007-09-06 22:34:47 · 3 answers · asked by Chander's 1

I’m studying fire and am struggling with what it is..

Not a liquid...
Not a solid...
Not a gas...
Not plasma...

2007-09-06 21:53:37 · 8 answers · asked by Anonymous

better if you can give their bibliographys and their other personal infos...it'll hep alot...thanks...

2007-09-06 21:42:07 · 4 answers · asked by Von 1

suppose take an example of tristate buffer then wat will be the voltage in its high impledence in a voltmeter or measurable device.

2007-09-06 20:54:36 · 5 answers · asked by sathish k 1

I have been given a task of designing an electrical standard for contractors at our food production plant. Any ideas of where to look for examples or information on this issue?

2007-09-06 18:50:23 · 1 answers · asked by Zane B 1