Engineering - October 2006

I have browsed through some websites, but the explanations are not quite the same. Some explained that it reduces the turbulence. What does the turbulence do in the absence of rear-end spoiler? Or is it better explained by Bernoulli principle? Or both? Explanation with drawings (showing air flow or pressure) would be appreciated.

2006-10-15 17:08:57 · 7 answers · asked by c_g_koh 1

Imagine you've got a gear train consisting of a large cogwheel on the same axle as a small cogwheel with, say a quarter as many teeth. A large cogwheel drives a small one and its adjacent large cogwheel drives the next small cogwheel, and this arrangement is repeated several times to give a high gear ratio. Each stage increases the ratio by a factor of 4. With the best materials, bearings and lubrication, what's the highest ratio you could achieve in practice?

2006-10-15 14:47:47 · 3 answers · asked by zee_prime 6

In the circuit, the capacitor has a capacitance of 2.5 µF and the resistor has a resistance of 0.5 MΩ. Before the switch is closed, the potential drop across the capacitor is 12 V. Switch S is closed at t=0. What is the current in R immediately after switch S is closed?

2006-10-15 14:06:31 · 2 answers · asked by Techdestroyer 1

2006-10-15 12:52:38 · 3 answers · asked by Lizabeth 3

How did old water fountains, such as the ones in Rome or other places in Europe, spray water before they had pumps powered by electricity?

2006-10-15 12:29:48 · 5 answers · asked by Johnny Guano 3

In microsoft excell a person can add and divide and other math. problems, but I have not found an easy way to understand the "if" command : "if" not greater than or less than. Can someone help me find the answer, or instructions?

2006-10-15 12:25:56 · 2 answers · asked by tito tito tito 1

I am trying to build a pneumatic pumpkin laucher for my farm as an attraction, I need something that can at least shoot a 5 pound pumkin 100 ft, any websites with information, or ideas?

2006-10-15 12:19:16 · 6 answers · asked by indrul1 3

Hi, I am trying to operate this electronic device which requires 9 volt. I can't use a single 9 volt battery, but I could only connect 6 double A batteries series like positive to negative. Over all, once this series is completed, how can I take the advantage to use those batteries in that series, and with out having the battery "heat-up"?
This device is needed to be used like a DC car cigarette plug. The series will be the female plug and the device will have a male plug. Can anyone help me make such power, with out any accessories except the DC plug, batteries and wires...? A website would be accepted.

2006-10-15 12:11:08 · 5 answers · asked by fra82 1

preferably a site or store i can order from

i dont want to spend anymore than $150 so if you know any other metals that make just as good electrodes please sugest them

2006-10-15 11:43:32 · 3 answers · asked by Anonymous

2006-10-15 10:35:06 · 3 answers · asked by Tuby 1

THE VACUUM UNIT SHOULD BE 10,000 BPD CAPACITY

2006-10-15 10:32:31 · 1 answers · asked by UCHEREV 1

I like civil engineering BUT I like to be inside in office,well dressed.So civil engineering is for me????????

2006-10-15 09:35:02 · 7 answers · asked by The Apostle 2

Is der any possibilty tat we can communicate(voice) between 2 mobile phones(say like 2 nokia which is S40 series) with bluetooth technology rather than callin de second number thru de GSM network??

2006-10-15 07:58:55 · 5 answers · asked by the_rebel843 1

2006-10-15 07:36:24 · 20 answers · asked by markie p 1

2006-10-15 06:57:29 · 3 answers · asked by kema 1

hw to answer ,with example

2006-10-15 06:52:32 · 15 answers · asked by fahad ubaid 1

The invention has to be in the math, science, or technology field and has to have influenced your life or the lives of other people. (I'm doing this for an entrance essay to a school that's hard to get into)
Thx

2006-10-15 05:54:17 · 16 answers · asked by Anonymous

I need to be able to test between 500psi and 3000psi.What size motor do I need and what phase?What kind of pump(piston,vane or gear)do I need?How many gpm and what type of pressure control valve is recommended?

2006-10-15 05:48:56 · 5 answers · asked by charles 4

i need information on the mechanism of multi cylinder engines, thier working and maintenance.
importance of multi cylinder engine in a car.
difference between single cylinder engine and multi cylinder engine.
working principle of multi cylinder engine and its advantages over the single cylinder engine.
draw backs of multi cylinder engine.

2006-10-15 05:44:44 · 1 answers · asked by Anonymous

(mechanical properties,tensile strength, hardness, ductility, toughness, microstructure, internal stress)

2006-10-15 02:56:31 · 5 answers · asked by cmgal 1

2006-10-14 23:15:21 · 6 answers · asked by raja s 1

Why do the planes turn n twist and zigzag while flying from one destination to another?

2006-10-14 22:41:37 · 18 answers · asked by Anonymous

2006-10-14 21:50:41 · 2 answers · asked by pornstar_rockrules 1

Could you send me a link or a file about industrial valves please?

2006-10-14 20:32:46 · 3 answers · asked by Anonymous

2006-10-14 20:05:32 · 4 answers · asked by cmgal 1

2006-10-14 20:00:52 · 3 answers · asked by cmgal 1

i believe an RFID in refridgerators would be good.
or even doors. i would welcome all ideas.
thanks

2006-10-14 17:17:57 · 2 answers · asked by Mr.tech 1

why the circuits are prone to damage in presence of moisture

2006-10-14 16:58:54 · 7 answers · asked by Anonymous

It is light
It does not catch rust
It is strong
but not repairable

2006-10-14 16:18:59 · 5 answers · asked by deepak57 7

I am writing this paper on a chosen topic in electromagnetic optics and I picked microlenses so as much details as I can get will be very helpful

2006-10-14 14:59:50 · 2 answers · asked by Hazzy 2