Engineering - December 2007

Like on an appliance. A hot plate.

2007-12-23 12:56:34 · 2 answers · asked by Carl W 1

ok, so i have a trebuchet, dr=21 inches, R= 10N. It starts horizontal, and stops instantly at vertical. what is the speed of what i am launching the moment it leaves the trebuchet (tell me if i need to put more information, this is a real trebuchet)

2007-12-23 08:48:42 · 5 answers · asked by tzahaldude 1

Once they approached the subject with an open mind.
I'm talking about people with a grasp of the laws of Newtonian physics, nothing fancy, just being familiar with the agreed laws of physics and mechanics.
By the way, what was the Popular Mechanics thing about? I read it, and was bemused that its physical sophistry was so clumsy.

2007-12-23 07:11:20 · 10 answers · asked by hog b 6

For a science project, I am building a battery operated electric vehicle. Its not a big vehicle just about 3 feet long and about a foot wide. I have got most things covered except one. I need a way to buy/build a switch in the circuitry that cuts off the battery power after a certain time. The aim is to make the car travel a certain distance/time and then stop. What is the best and easy way to build a switch that will operate under these conditions? I have a motor powered by a battery pack and I need this switch in the circuitry so that it can shut power off after a programmed time.

Thanks for taking the time to look at this.

2007-12-23 06:11:49 · 2 answers · asked by newlex 2

a. plumbing line
b. floor joist
c. electic panel
d. ground

2007-12-23 06:04:15 · 2 answers · asked by onyx 1

2007-12-23 05:42:10 · 5 answers · asked by Anonymous

2007-12-23 05:34:31 · 8 answers · asked by lovelybrain 1

200# steam at 500deg F. There theoretically should not be any condensate but there should still be a drip leg. How do calculate the condensate load.

2007-12-23 05:10:02 · 2 answers · asked by drew 2

Does anybody know the vapour resistance value of Perlite?

2007-12-23 04:49:54 · 1 answers · asked by Webbsr1 1

2007-12-23 04:20:30 · 3 answers · asked by rajev v 1

Sturctural?
Petroleum?
Electrical and Communications?
EloctroniC and communications?

2007-12-23 03:51:43 · 8 answers · asked by Anonymous

I'm building a small vertical axis wind turbine for a school project. I wasn't getting the voltage I needed with wind from the fan I had, so I decreased the radius to increase the rotational velocity. When I halved the radius (and doubled the RPMs), the voltage more than quadrupled. Is this an accurate relationship? Or should the relationship be linear and some other factor accounts for the increase in voltage?

2007-12-23 03:49:40 · 2 answers · asked by emalynn.eleriel 1

2007-12-23 03:40:35 · 2 answers · asked by aravind_arunram6 1

In my history class, we just learned about them. I was wondering if anyone like actually knew how to build the big ones that they had in the renasaince. in school we get to shoot baseballs from them. =]

2007-12-23 03:34:03 · 3 answers · asked by Lilly F 1

Could u give me some

2007-12-22 20:17:26 · 3 answers · asked by Qatarya 1

2007-12-22 20:06:42 · 1 answers · asked by Anonymous

I have looked all over the place. I am wanting to reduce the compression chamber for torque gains if it is worth it. Please help.

2007-12-22 18:11:10 · 4 answers · asked by jjones2706 2

Does anyone have any theories on how a flying broomstick work out of a Harry Potter movie if it were real? How would you make them able to accelarate quickly, maneuver/brake perfectly, and be pretty light while also protecting the rider from winds and inertial winds? I WANT A SERIOUS ANSWER!! NOT JUST SYAING THEY'RE NOT REAL OR THEY WORK BY MAGIC

2007-12-22 16:47:17 · 8 answers · asked by Anonymous

You know the big spot lights you see in the sky. Can you make one out of LED lights? If so can you have different colors like red and would it be cheaper to run?

2007-12-22 16:36:43 · 5 answers · asked by John B 2

a. the hot and neutral are wired forwards
b. the ground and neutral are wired backwards
c. polar bears walk backwards
d. the hot and neutral are wired backwards

i picked d am i right?

2007-12-22 12:51:33 · 4 answers · asked by onyx 1

2007-12-22 09:48:35 · 5 answers · asked by Jesus is the best. 3

2007-12-22 08:32:38 · 5 answers · asked by David M 1

how current varying from 4 to 20 mA although there is a constant voltage 24Vdc on the 2 wires...

2007-12-22 08:06:26 · 3 answers · asked by MaxTempo 1

Note that the industry incorporates a lot of fatigue research, physiology, material research, and aerodynamics.

I am talking about designing/R&D of cycles.

2007-12-22 05:29:47 · 8 answers · asked by shakeyourbotty 2

I'm looking to install a three phase panel right behind my rotary phase converter that will be producing 240V delta. If I use a three phase panel rated for 240/120V three phase, is it possible to get balanced, single phase from the panel?

2007-12-22 05:06:23 · 6 answers · asked by deep_fried_wonton 1

For cosmetic reasons, we've left the burned out bulb in the socket which raised the before mentioned question. We've loosened the bulb so there's no contact but we were just wondering about the possibility of "juice" still being drawn into the point of contact.

2007-12-22 03:39:09 · 8 answers · asked by Vince T 1

* I know that a page of text has a less memory size than a page of a coloured pgoto !
* But I notice that some text pages have more memory size than a coloured photo pages! HOW THAT COMES!?
** How can two different photos taken by the same camera have different sizes?
PLEASE EXPLAIN WITH DETAILS!!

2007-12-22 03:33:43 · 3 answers · asked by Anonymous

i've read that gearing down and using engine braking saves fuel, compared with coasting up to traffic lights. But how can this be if the engine is in neutral it's not under load so it can't use much fuel. which one is right.

2007-12-22 03:31:15 · 17 answers · asked by Group Captain Lionel Mandrake 5

i am a student of mechanical engineering plz guide me . your cues would be so effective for me. tnx

2007-12-21 23:52:48 · 5 answers · asked by reza_hemmatdj 1

I have a 5.5kW 3 phase motor (415v) on a vacuum pump.
We have measured the amps on each phase with a clamp meter and have found two phases are around 9 amps whilst the third is measuring 10.6 amps. The motor is configured in Star (one strap across three of the terminals).

Is this difference enough to cause a problem?
What would the problem be? Noisy, alternating speed??
The motor name plate states amps as 13.5. Will this be full load current? Typically how many amps would you expect a motor to draw if the full load current was 13.5 amps.

Any help very much appreciated as we are going to begin dismantling the vacuum pump any minute now and don't want to if the motor is suspect. Still got Christmas shopping to do / start!

Thanks in advance.

2007-12-21 23:26:07 · 5 answers · asked by Anonymous