Engineering - September 2007

How do lasers read CD’s

2007-09-21 05:00:48 · 3 answers · asked by HONG 2

2007-09-21 04:32:25 · 4 answers · asked by Anonymous

2007-09-21 04:10:59 · 4 answers · asked by kylegaston13 1

I know that the electronic ballast can convert the frequency up to a few KHz, but how could I obtain a higher frequency AC source at the MHz Range?

2007-09-21 03:07:58 · 3 answers · asked by nakazawa 1

2007-09-21 02:07:50 · 4 answers · asked by john d 1

What are the most powerfull sterling engines produced and what is the cost of running them?

seen apic of a claimed 5kw engine, any others.

2007-09-21 01:49:30 · 3 answers · asked by Anonymous

2007-09-21 01:38:32 · 2 answers · asked by diamondlilgirl 2

I need to find the properties and additives of a cement produced by a cement producer on their web page or from a catalog. This needs to come from an on-line source. Any ideas? Thanks!

2007-09-21 00:56:38 · 1 answers · asked by Confused about life 2

2007-09-20 20:41:31 · 3 answers · asked by deepak_8584 1

2007-09-20 19:38:29 · 6 answers · asked by Chuck S 1

So I am looking at a site that sells magnets.
Some say:
Pulling Force: 28.67 lbs
and some say
Holding power is 24.8 lbs.

what is the difference between pulling and holding?

2007-09-20 16:51:41 · 2 answers · asked by Philip Augustus 3

2007-09-20 15:23:23 · 6 answers · asked by Anonymous

2007-09-20 14:45:39 · 8 answers · asked by Lakers24 2

2007-09-20 14:45:10 · 4 answers · asked by Lakers24 2

2007-09-20 14:42:10 · 6 answers · asked by Lakers24 2

i've read about making a small one using butane but i want to stick to the safer solvent, c02. plus the butane one is too small volume. I want 10L plus. I plan on adapting a large pressure cooker. i've learned that the critical pressure for co2 is 1100 psi, which is higher than it comes in the canister. if i heat the cooker while pressurising it will i achieve the pressure? the critical temp for co2 is 88F so i have to stay above that anyways. if i know what i'm talking about so far, i could heat the pressure cooker while pumping co2 into until I achieve the right pressure and temp at which point i could open a valvue at the bottom of the cooker at a rate that stays above critical.. will it work? is there a better way? am i doing anything dangerous or illegal without a licence? any answers appreciated.

2007-09-20 13:43:17 · 2 answers · asked by Anonymous

just wondering

2007-09-20 13:41:38 · 1 answers · asked by macgyver 1

,when I intend to start up a factory, after my undergrad? I have plans to create this factory in China that will export products back to US. So I also might do a minor in international business to increase my knowledge about the intricacies in global business. If I do successfully graduate with a engineering degree, would I be able to create products and eventually manufacture them? I don't know the details so if anyone can inform me, that'd be great.

2007-09-20 13:26:55 · 3 answers · asked by JL989 2

Hi, I am currently a junior in MechE. I picked mechanical because it's the 'ever green' engineering field, meaning it's the most versatile in job selection and it allows you to do a master's in just about any engineering discipline. But after looking at some coursework that MechEs and ChemEs share (Thermodynamics, Fluid Mechanics, Heat Transfer, etc.), I realized that I am more passionate about those subjects and chemistry subjects. I go to a top 5 MechE school, and I've talked to an advisor from the ChemE department. She told me the only coursework that they require for you to make up is Transport Processes and Reactor Engineering. I was surprised because I thought more would be required (like Orgo, separations, etc.). So, finally, here's my question: what additional coursework would you RECOMMEND that I make up? If ChemEs in the field are reading this, which subjects from your courses do you find to use the most and are most helpful to your work? Thank you.

2007-09-20 13:18:42 · 2 answers · asked by Anonymous

A plane equipped with fixed horizontal engines and wheel landing gear is placed on a huge treadmill runway. The treadmill has a clever design and always matches the speed of the plane, but runs in the opposite direction. Will the plane take off and fly or not?

2007-09-20 11:44:25 · 4 answers · asked by spector_17 1

Not asking for someone to analyze it for me, I am just confused by the three voltage suppliers... how do I go about applying KVL? Here is the actual question:

First use KVL to find the voltage across each resistor, then use Ohm's law and KCL to find the current through every element, including the voltage sources.

OK that's fine, but how do I know which way the current flows and how having 3 voltage supplies in parallel effects this? I'm lost, any hints would be most welcome. Here is the circuit:

http://images7.pictiger.com/thumbs/8a/e005134f1833a4f4bbe72f892128ae8a.th.jpg

2007-09-20 11:38:33 · 3 answers · asked by Anonymous

2007-09-20 08:29:10 · 3 answers · asked by arquerozdm 2

2007-09-20 07:44:55 · 6 answers · asked by prasannan k 1

????????????????????????????????????????????????????????????????????????????????????????????????

2007-09-20 07:13:01 · 4 answers · asked by mr i don't know 2

2007-09-20 07:07:56 · 8 answers · asked by Rick 1

2007-09-20 05:55:33 · 3 answers · asked by Roshni 2

You know how some pipes are made of copper well what makes copper good for making pipes?

2007-09-20 05:48:09 · 12 answers · asked by The Guru 2

what are the equipment you use for a high voltage test, please list the steps taken during this operation

2007-09-20 04:52:12 · 4 answers · asked by kawuremi 1

What is difference between them?

2007-09-20 04:38:19 · 1 answers · asked by karan s 1

How do I put a matrix in tabular form?

2007-09-20 04:20:53 · 1 answers · asked by Rutgers101 2