Engineering - September 2007

I need some help for some medical research. i want to measure the "negative" pressure generated by small syrignes of about volume 5 -10 ml I have a digitron 2082 differential manometer for this. My problem is that there is some dead space between the syringe and the measuring membrane, and i feel that it may influence the results, becuase the air in the dead space may expand. how can i get rid of this dead space? can i fill it with water, or is there some other liquid that i can use with out damaging the manometer ?

2007-09-14 10:36:30 · 2 answers · asked by Nirmala 4

2007-09-14 09:51:07 · 2 answers · asked by animal 1

need help

2007-09-14 08:36:34 · 2 answers · asked by alphajoe 1

2007-09-14 08:33:58 · 6 answers · asked by Anonymous

for example, if 1.5 V with a current discharge of 500mA is it going to last longer than a 1.5V with a current discharge of 1 A? or does the voltage determine the battery?

2007-09-14 07:58:46 · 5 answers · asked by Lee Hal 2

I need a good textbook which is about thermodynamic, most importantly part which I care is the Diagram, for I know nothing about it now, I need one not too difficult

2007-09-14 06:54:26 · 2 answers · asked by China boy! 1

2007-09-14 06:06:32 · 10 answers · asked by Anonymous

2007-09-14 05:55:58 · 7 answers · asked by mlinghong 1

2007-09-14 05:35:17 · 3 answers · asked by Anonymous

wood stove
oil burner
electric heat
gas heat
solar heat
kerosene heat

2007-09-14 05:00:15 · 1 answers · asked by Anonymous

Here goes the question again. , For the sake of illustrating the impact we are having on the planet, What I would like to know is, based on the number of ALL vehicles worldwide that burn petroleum based fuel, including cars, ships, equipment, planes, etc PLUS smokestacks from factories, power plants, etc, what would be the cumulative size of all of these exhaust pipes, represented as one huge pipe. Also we could, with some more difficulty figure out an average of how many of these engines are running at any given time and just calculate the diameter of that imaginary exhaust pipe, spewing out pollutants. The physics handbook http://hypertextbook.com/facts/2001/MarinaStasenko.shtml lists one figure of 600 million cars worldwide. At an estimated average exhaust diameter of 1.5 inches, times that figure, the imaginary tailpipe of just vehicles alone would be 14,000 miles across? (I must be figuring this wrong!!!) Please help! Thanks

2007-09-14 04:51:22 · 2 answers · asked by doodlebugs 2

Im doing an assignment for college on Robert Boyle.. I just cant find a simple explination or definition for his law in terms that I can actually understand..

Boyles law:

"Volume and pressure of an ideal gas held at a constant temperature"

This simply means nothing to me..

Can anyone simplify it into easier words?

Thanks

2007-09-14 04:26:28 · 5 answers · asked by Anonymous

As a result of some malfunction, the pressure in the tank rises to 2 MPa at which point the tank explodes. Taking the atmospheric pressure to be 100 kPa and assuming the liquid in the tank to be saturated at the time of the explosion, determine the total explosive energy of the tank in terms of TNT equivalence. (The explosive energy of TNT is about 3250kJ/kg, and 5kg of TNT can cause total destruction of unreinforced structures within about a 7-m radius

2007-09-14 03:48:39 · 2 answers · asked by Anonymous

If I tried it on everything plugged in for 1 hour at 140% voltage, what kinds of things would I see?

http://s223.photobucket.com/albums/dd78/floodtl/?action=view¤t=SmallVariac.jpg

2007-09-14 03:20:10 · 5 answers · asked by Anonymous

I'm looking for articles or if anyone knows of this happening.

Thanks.

2007-09-14 02:50:31 · 3 answers · asked by James W 2

i have problems with the bottle producer. whatever i design, even if the proportion are looking allright, the quantity of liquid is wrong. so basically i need, after designing, to verify the quantity of liquid the bottle contains. Thank :-)

2007-09-14 02:20:59 · 1 answers · asked by GIO 3V 1

.) HVDCT: a) When is high voltage DC transmission used in electric networks? b) Give at least five examples (places) where it is/has been applied

2007-09-14 02:08:21 · 2 answers · asked by ram 1

Am seriously interested in purchasing a torsional pendulum clock - must have all parts and the dome in good condition. And must have the winding key.
I am a watch enthusiast and would like to study the working of this clock. It doesn't matter if the clock isn't working but must be in a repairable condition. Please let me know if you are interested or let a friend who has such a clolck and willing to sell know, Thanks !!!

By the way for those not familiar this type of clock has a rotational rather than a swinging pendulum. The pendulum hangs on a fine suspension wire.

2007-09-14 00:07:49 · 1 answers · asked by frank m 1

What products are created in the Midwest from natural resources?

2007-09-13 23:53:45 · 2 answers · asked by ugcj10 1

Is there a formula for calculating how many litres in a fridge/freeser by measuring the inside lenghtxwidthxheight ?
Then maybe getting cm/inch^2 and changing it to litres?

Thanks

2007-09-13 23:49:25 · 2 answers · asked by Bradley 1

2007-09-13 22:58:15 · 1 answers · asked by deepak_8584 1

How does a rectifier diode differ from a communication diode? Can they be used interchangeably?

2007-09-13 22:31:44 · 2 answers · asked by Atul I 2

Is there a way other than using capacitors? I want to build one without the risk of electrocuting myself. Or is there a risk free way of using these capacitors?

2007-09-13 21:32:40 · 3 answers · asked by worried person 1

A Used Mazak Horizontal Machining center has to be Inspected under power . It is in Scottsdale,Arizona,USA.

2007-09-13 21:13:57 · 2 answers · asked by makino_bt 2

2007-09-13 20:46:21 · 3 answers · asked by Anonymous

i'm not understanding this question. i don't know how to handle a circuit with 2 voltage sources

an electric heater is connected to a constant 250V source and absorbs 1000W. Subsequently, this heater is connected to a constant 210V source. What power does it absorb from 210V source? What is the resistance of the heater? Model the electric heater as a resistor.

2007-09-13 20:21:46 · 4 answers · asked by may 1

2007-09-13 20:10:31 · 2 answers · asked by impactkom 1

2007-09-13 20:08:42 · 2 answers · asked by impactkom 1

2007-09-13 18:53:56 · 10 answers · asked by raphael adevera 2

I'm in the process of building my first wind turbine and was curious if running it without a load (ie. battery bank) would be harmful to the generators? I'm using a 260VDC 5A permanent magnet treadmill motor as the generator. I'm about ready to put up my tower and wasn't sure if I can go ahead and get it all assembled and put up and then add the battery bank as soon as I can get the batteries. This way I could also see how well it's going to perform on the tower. It's a 60' lattice tower and will be hinged at the bottom but still will be a bit of a pain to lower and raise a lot. I'm really excited about getting this up and running but don't want to damage anything before I even get started.

Also I've heard of people using old electric baseboard heaters as a load dump when the bank gets fully charged. I'm having some trouble locating any of these around here and was wondering if anyone would have any other suggestions on something I could use as a dump? Thanks for all your time.

2007-09-13 17:07:36 · 2 answers · asked by dragon_slayer79 2