Engineering - January 2007

2007-01-30 16:36:12 · 2 answers · asked by Johnny 1

2007-01-30 16:12:11 · 5 answers · asked by Anonymous

I have a box full of water. I need to put a shaft/axle with one end in the box and the other sticking outside of it. Each end has a gear attached. I need to spin the gears using the axle and make the whole box waterproof so nothing will spill out.

The connection would be similar to the way a ship has the engine on the inside and the propeller on the outside attached by a turning shaft.

What is the name or method of that seal?

2007-01-30 15:50:47 · 2 answers · asked by Michael K 2

2007-01-30 14:46:19 · 1 answers · asked by j s 1

2007-01-30 14:28:59 · 1 answers · asked by Anonymous

my printer wouldn't turn on again when i turned one of these on
(aside from making sparks from the camera flash circuit by charging it and placing a wire in betwing the capacitors terminals)

just wondering and pardon the spelling

2007-01-30 14:23:11 · 3 answers · asked by macgyver 1

wire or rope until it breaks. There is a point right before it breaks at the twist and it is called something but I cannot think of it. I want to say Super something or Heli something. Someone please help, it is driving me nuts......

2007-01-30 14:07:58 · 4 answers · asked by got2bee3 1

2007-01-30 14:01:48 · 13 answers · asked by jhen 1

I have seen these model helicopters that are even able to fly 'up-side-down' and in all directions.... they seem to be very powerful . Some even eject some form of 'gas' so i guess it has an engine.

can you please tell me to what 'category' these helicopters belong to.
If i go to a toy-shop saying what name should i ask for one?

2007-01-30 14:00:45 · 1 answers · asked by sh 1

What's the different between LED, Xenon, HID, and Halogen in Lumens, efficiency, power consumption.. I want to build a Flashlight with this sort of criteria :
- At least 4 hours burn time.
- Extremely bright ( at least more than 400 lumens)

Please give me a long details about this,
Thank you for the informations given..

2007-01-30 13:42:01 · 2 answers · asked by senjaya_chang 1

2007-01-30 13:05:22 · 2 answers · asked by azmanmohdali m 1

2007-01-30 12:48:51 · 3 answers · asked by im ur daddy 2

i have a 30hp induction motor which powers a screw type extrusion with heavy load. my guess is the pressure inside the cylinder can reach up to or more than 1,500 psi which can cause over or under pressure. in effect, over pressure causes over coating, over heating, wear & tear to the cylinder and screw. (screw @ constant 30rpm, thats why it tends to over pressure. because it just keeps going and continue to build up pressure) under pressure causes undercoating. my intentions are to control the pressure inside by replacing induction motor to a hydraulic motor, my guess is that it would control the pressure inside by self adjusting the screw rpm, if i set a certain pressure to the hydraulic pump, will it maintain the set pressure inside the cylinder?? or self adjust the rotation speed?? like if the cylinder is overpressure it will slowdown to maintain the set pressure and if its under pressure it will compensate and attain the set pressure by rotating the screw faster??

2007-01-30 12:03:17 · 2 answers · asked by well_behaved_guy 1

how can i upgrade a laser pointer that i bought, its a cheap one but id like to make it stronger! thank u

2007-01-30 11:10:42 · 2 answers · asked by Zeratul 3

In our design and construction class, we have to design a small crash car that will hold 4 small 5/8" paintball passengers, and will then be run into a wall at speeds of 50-60 mph, on compressed carbon dioxide. The passengers should survive. Could someone either a) give me an idea as to what the basic design should be, or b) point me to a site that explains the physics of a car crash? And how to most effectively design a car?

2007-01-30 11:09:18 · 2 answers · asked by Suzanne G 2

It controls 4 electric fans which depend on the number of people inside a room, very useful in a classroom. It also has a timer to set how many hours the room will be used.

2007-01-30 10:35:59 · 4 answers · asked by marvin_jimenez9 1

2007-01-30 10:32:37 · 3 answers · asked by kawaii_niikii 2

Letters will have different direction to display. It can be change using Bluetooth using the laptop

2007-01-30 10:31:16 · 2 answers · asked by marvin_jimenez9 1

It controls 4 electric fans which depend on the number of people inside a room, very useful in a classroom. It also has a timer to set how many hours the room will be used.

2007-01-30 10:17:41 · 1 answers · asked by cj_102505 1

I have a question about an inverting amplifier.

|||--R3---------|.\
. . . . . . . . . . . .|...\_____V(out)
V(in)--R1-----|.../. . . . | .
. . . . . . . .. |. . .|./. . . . . | .
.................|_ __R2__| .

R1 is at V(in) of the amp, R2 is connected to V(in) and V(out) and R3 is attached to the ground and the (+) input, just like a normal inverting amp.
ok this is suppose to be an inverting amplifier, with
R1 = R2 =10kOhms
What should R3 be and why? I figured out that it is suppose to be the sum of R1//R2 = 5kOhms but I'm not sure why.

Any help explaining the reasoning behind it.

2007-01-30 10:08:58 · 4 answers · asked by kevins963 2

Compare and Contrast Hydraulics and Pneumatics
~Help!~

2007-01-30 09:50:30 · 1 answers · asked by Anonymous

Thermodynamics

2007-01-30 09:46:01 · 3 answers · asked by Anonymous

2007-01-30 09:01:01 · 3 answers · asked by charles b 1

I havea starter from a 220 volt motor on a doe machine. The contactor will pull in by bypassing the amperage part. We think it may be wired wrong. do you have a wiring diagram for a starter?

2007-01-30 08:49:33 · 1 answers · asked by Anonymous

What are the forces that make soccer balls curve when kicked? What materials are soccer balls made with ?

2007-01-30 08:49:06 · 5 answers · asked by Anonymous

2007-01-30 08:38:02 · 4 answers · asked by MOH Alkirshy 1

A manufacture produces integrated circuit amplifier modules that have voltage gains, which vary from 12,000 to 24,000 due to production tolerances. If the modules are to be used with 5 percent neg feedback applied , determine the min and max values of voltage gain

2007-01-30 08:26:42 · 2 answers · asked by servalan 1

2007-01-30 07:37:14 · 2 answers · asked by Osama 1

2007-01-30 07:30:09 · 1 answers · asked by Ali A 1

it's when we shiver or shudder for a few seconds and we quote"someones just walked over my grave"....where does the expreshion come from and why do we do it when the room temperature is warm

2007-01-30 07:19:46 · 2 answers · asked by tee 2