Engineering - December 2007

2007-12-16 14:28:17 · 7 answers · asked by Norma P 2

The design i was thinking about was a half oval (with 4 arches), with the open end down, and the pyramid built around it. The design should be structurally sound, and the construction materials used are only stone (like the egyptians). No current-day technologies can be used. Thanks for the help.

2007-12-16 14:18:28 · 1 answers · asked by The one...the only 1

2007-12-16 13:47:33 · 6 answers · asked by peacelovedazzle 1

2007-12-16 11:42:12 · 9 answers · asked by quinn1870 1

can anyone give me a good website that has prints and details on how to build a railgun

2007-12-16 11:30:54 · 1 answers · asked by gambet1976 1

where are the sensors typically located and how do they determine the intesity of the rain?

2007-12-16 10:28:36 · 6 answers · asked by cdcarola 2

2007-12-16 10:07:17 · 4 answers · asked by Anonymous

http://s226.photobucket.com/albums/dd11/jackphotos123/?action=view¤t=Wedge-1.jpg

2007-12-16 08:38:22 · 6 answers · asked by Anonymous

I need to know this information so that I can configure my Steca charge controller to charge my batteries.

2007-12-16 06:37:58 · 1 answers · asked by Anonymous

2007-12-16 05:21:52 · 6 answers · asked by Anonymous

How would you explain it easy English so every one would understand ?

2007-12-16 04:53:32 · 9 answers · asked by T C 1

For a project I need to have a 8.5 X 11 inch sheet of paper equal 217,300 square feet (5 acres) how do I setup a scale?

2007-12-16 04:43:09 · 5 answers · asked by Dave K 1

If vertical wind turbines could be made thin enough and effecient enough, they could be placed on house rooftops and be very discrete (maybe only about 12 inch tall and 12 feet diameter). A top plate could conceal the spinnig blades. The contest could require that the turbines have a max area, max height, and must work for a certain amount of time (months?). On the start date, entrants would build their turbines on a specific site. The organisation(s) sponsoring the contest would get the rights to the generated electricity. The group with the most effecient turbine after the time frame would win the prize money. Entrants would also pay to enter. I think this would be a great opportunity for many engineering universities and for the organisation(s) sponsoring it. It could also lead to MANY new "rooftop" turbine concepts that could help power individual homes, without having the large "windmill tower". Maybe a similar concept could be used for the most effecient solar panel?

2007-12-16 04:19:06 · 2 answers · asked by Bman 1

I plan on wiring together eight 12V 35Ah Helios Sealed Lead Acid golf cart batteries (model FB 12-35) in series and parallel to give me a 24V battery bank. The bank will be used with a 24V inverter to give me 110VAC and will be used for backups as well as small loads like a wireless router. It will be charged with a solar panel.

If I setup the batteries in my basement, would I need to ventilate them? I've read that sealed lead acid batteries do not vent any gas but I want to be sure about it.

Here is a page showing the type of battery I purchased:
http://www.batteries.com/productprofile.asp?appid=265102

Does anyone here know if this battery has liquid inside, or uses AGM?

2007-12-16 03:35:19 · 4 answers · asked by Anonymous

2007-12-16 01:51:57 · 2 answers · asked by ramesh 1

Please only answer if you are a structural engineer, doing such work...Excuse my ignorance, but.... We are considering some (fairly minor) alterations to our house. I realize everything structural should be taken seriously, but sometimes it seems overdone. Consider adding a single window to a load bearing wall framed with 2x4's. One could argue such a wall should not exist, but it does. Anyway, if one 2x4 is cut to make the opening, and a triple 2x8 header installed, this is inarguably overkill, and would only cost about $15 for material. But, I often hear 'consult....' with such an issue. That stops me dead in my tracks because...If an engineer is going to 'certify' such a job, I can envision he may first want to ensure that the studs, foundation, and ground on either side of window can support new load. Perhaps he should also supervise the removal, temporary support, and installation. This could cost $1000's. So, what do I do for a project needing several seemingly simple changes?

2007-12-16 01:37:29 · 2 answers · asked by Anonymous

I have two blowers of 10 HP each fixed on the terrace. One blower is very smooth running and silent whereas second blower is giving vibrations to building structure. Both the blowers are fixed on the same foundation. Dynamic balancing of impeller is ok. Level of pedestal bearings is ok. Pulley alignment is ok. Both the blowers are same, but one is giving vibrations. Help please.

2007-12-15 23:44:14 · 7 answers · asked by Pirate of the Bassein Creek 4

I'm guessing its to do with the strength requirement of the signal (conventional radio waves can afford to have poor signal strength but Digital waves can't), but does anyone know the answer for sure?

2007-12-15 21:51:36 · 5 answers · asked by vEngful.Gibb0n 3

Do you think it is practical to solve the productivity problem by hiring more programmers or systems analysts?
Why or why not?

2007-12-15 21:35:09 · 2 answers · asked by AhLcYnC 1

2007-12-15 17:53:25 · 10 answers · asked by chinese_helicopter 2

The house has two heat pumps and two 250 ft deep vertical closed loop wells. The only think I don't know is whether or not the wells are exclusive to the individual pumps. There are two separate air handlers (two thermostats obviously controling the air handlers.) I'm wondering if it will damage the system if one pump is run to cool one side of the house for those who like it cold at night and the other pump heats the other side of the house for those who like it warm. Thanks!

2007-12-15 16:47:23 · 3 answers · asked by Peter J 1

2007-12-15 16:40:18 · 3 answers · asked by Y Y 1

2007-12-15 16:15:54 · 3 answers · asked by Anonymous

I have been given/ have figured out:
the boyant force, the mass of the air in the balloon, the mass of the load, the volume of the balloon, the temperature of the surrounding air, the atmospheric pressure, the density of the air, and air molar mass.
but i dont know how to find what the air temperature must be to lift the balloon and load. Help?? her's the question:

A hot air balloon stays aloft because hot air at atmospheric pressure is less dense than cooler air at the same pressure. If the volume of the balloon is 500m^3 and the surrounding iar is at 15 degrees C, what must the temperature of the air in the balloon be for it to lift the total load of 290 kg(in addition to the mass of the hot air)? The density of air at 15 degrees C and atmpospheric pressure 1.013 x 10^5 Pa is 1.23Kg/m^3. Air molar mass is 29g/mol. Present your answer in Fahrenheits rounded to the whole number.

2007-12-15 15:15:45 · 1 answers · asked by Anonymous

You have a square cam, and an accentric,circular cam - bulging from the shaft. If you traced the up and down (SHM?) movement of the follower against a moving strip of paper, in what respects would the traces differ from each other, seeing that one cam is sharp and pointy and the other is smooth and circular. In both cases there is a regular changing of a ('radius' ?), but how would you describe this mathematically..?

2007-12-15 15:15:02 · 2 answers · asked by c0cky 5

Im talking about a suit or flying device that can get lift from the ground only using the power of your body , will this ever be possible?

2007-12-15 14:37:14 · 19 answers · asked by give me TRUTH 3

Which two liquids should i compare for my sci. project?

I am doing water rockets. I was going to put water in Rocket A, and put Milk in Rocket B, and see which one went higher.

I hypothisized that Water would go higher since it had a lower density.. but no I'm hearing that milk and water have similar densities.. so there wont be much of a difference in the heights of the rockets..

So now im thinking to compare Rubbing alcohal vs. Water..?

Is there a difference in densities for these two liquids?

Which two liquids should i compare?

Any other ideas?

2007-12-15 14:22:56 · 7 answers · asked by Anonymous

2007-12-15 13:57:48 · 3 answers · asked by binu v 1

2007-12-15 13:23:06 · 1 answers · asked by gina S 1

I am doing water rockets. I was going to put water in Rocket A, and put Milk in Rocket B, and see which one went higher.

I hypothisized that Water would go higher since it had a lower density.. but no I'm hearing that milk and water have similar densities.. so there wont be much of a difference in the heights of the rockets..

So which liquids should i choose to compare

Water vs ____

I wanna do a liquid with a high density -- no soda

2007-12-15 13:03:48 · 7 answers · asked by Anonymous