Engineering - December 2006

Usual vacuum obtained inside a closed airtight container is 760 mm of Hg or 29 t0 30 inches... Can we increase this..ie., numerically reduce this value ?

2006-12-07 14:56:08 · 9 answers · asked by Ground zero 1

I have an outdoor shed that has a high pitched roof that will allow an upper floor to be added. The pitching starts at 10 feet. To lay a floor down, what size crossbars should I lay down left to right so that I can place plywood on top of this that will provide good stability for support. The floor will contain boxes and overflow items, but not heavy items such as machinary.

Are 2 X 4 beams heavy enough, and if so, how far apart should they be? I assume 3/4 inch plywood is acceptable as the floor on top of the plywood.

Thanks

2006-12-07 14:11:48 · 3 answers · asked by nathan_strahl 1

2006-12-07 14:09:06 · 2 answers · asked by Meghan d 1

to clarify myself

2006-12-07 13:46:56 · 3 answers · asked by grefriend 2

2006-12-07 13:34:27 · 7 answers · asked by Anonymous

also b. Calculate the unstretched length of the bungee cord.
A bungee jumper with mass 64.0 kg jumps from a high bridge. After reaching his lowest point, he oscillates up and down, hitting a low point eight more times in 34.5 s. He finally comes to rest 24.0 m below the level of the bridge.

2006-12-07 12:40:34 · 2 answers · asked by Layla 1

I've been told that a volume of steel balls regardless of the daimeter will weigh the same. How can this be proven?

2006-12-07 11:57:40 · 12 answers · asked by fallter 2

it cant be higher than 76 cm long. it needs to have fins with a with of at max 10 cm. it also needs a ballast and a nose piece. in other words, wut do i use to fill the ballast, to make the nose peice, and wut shape fins. plz help me!

2006-12-07 11:55:33 · 1 answers · asked by Answers101 1

What are the limitations of current bridge researches that involves Finite Element methods and those that don't?
What are the solutions to these limitations?

Please answer clearly and provide links if needed!

Would it be better if we use like other methods like meshless, boundary element, finite volume or finite voulme method to model bridges?

2006-12-07 11:52:29 · 2 answers · asked by Anonymous

The length of a simple pendulum is 0.72 m, the pendulum bob has a mass of 308 grams, and it is released at an angle of 10° to the vertical.

2006-12-07 11:45:54 · 1 answers · asked by Layla 1

2006-12-07 11:43:23 · 1 answers · asked by joseph kuah 2

A roast was cooked at 325 °F in the oven for 4 hours. The internal temperature rose from 32 °F to 145 °F. What was the average rise in temperature per hour?

2006-12-07 11:08:49 · 12 answers · asked by Jennifer 1

what was da vinci's principle of flight/ aviation?
thank you!

2006-12-07 11:06:50 · 1 answers · asked by gabb 2

and in the other, if one goes out the rest are still on? which is which?
series circuit? parallel circuit?

2006-12-07 11:04:21 · 3 answers · asked by Anonymous

2006-12-07 10:28:50 · 3 answers · asked by jasper_all4lv 2

mmm can you give some examples about the quantative characteristics???

2006-12-07 09:18:58 · 1 answers · asked by Anonymous

can any one explain what thermodynatice means and how it effect engineering. thank u i really appreciate if any one can help me.

2006-12-07 09:14:36 · 6 answers · asked by blessedchild 1

specifically from 1 nato standard 5.56 mm ammo and .50 calibre ammunition
taking a distnce from the gun of 20 feet, how much thickness in mm of spring steel, black mild steel, aluminium alloy and fibreglass filler would i need to stop 5.56 nato first
and then 50 calibre bullets

2006-12-07 09:07:49 · 2 answers · asked by mrx 1

Work with prints and drawings for 25+ yrs. structural,mechanical automotive,etc... done a lot of on site modification of drawings and prints for engineers and cad users.I used2 and3 point perspective. visualization of fit,lot of sketching.I want to make the drawing now, not just the visualizations and sketched revisions for the engineers.Any basic GOALS I might start with in school? I am in 2nd semester Mech Engineering. NEED SOME SERIOUS INPUT,Thanks

2006-12-07 09:07:24 · 4 answers · asked by Tracker 2

IF you can answer these thanks alot!! This might help:
power rating =current x voltage
1. An electric space heater requires 29 A of 120 V current to adequately warm a room. What is the power rating of the heater?
2. A color television has a power rating of 320 W. How much current is in the television when it is connected across 120 V?
3. The operating voltage for a light bulb is 120 V. The power rating of the bulb is 75 W. Find the current in the bulb.
4. The current in the heating element of an electric iron is 5.0 A. If the iron dissipates 590 W of power, what is the voltage across it?

2006-12-07 08:55:27 · 2 answers · asked by Anonymous

2006-12-07 08:23:39 · 10 answers · asked by puffy 1

2006-12-07 08:12:28 · 14 answers · asked by Anonymous

2006-12-07 07:50:53 · 13 answers · asked by Nick W 1

for an engineer who work with building design

2006-12-07 07:47:52 · 1 answers · asked by Anonymous

hey fellas,
my instructor gave us some kind of report consists of three questions,
what are the applications of differential eqation in control engineering?
how can we use a DE solver on computer to solve them
why are we taking a DE course while we can solve them on computer?
can you give me a title for such a report??

2006-12-07 07:47:44 · 5 answers · asked by mr_fantastic 2

2006-12-07 07:39:46 · 3 answers · asked by eltitere 1

another one of these:

"A kennel operator wishes to enclose a rectangular area against the wall of a building to form a dog run. A dog lover donated 120m of fencing to create a run of maximum area."

i have to find the dimensions of the 3-sided rec so that the area is maximized, and have to find the best dimensions for the run. this is a spreadsheet assignment for the length, width, and area. the max length has to be 120 and minimum 0, but i can't figure out how to calculate the dimensions on the spreadsheet (ie. i have to figure out the width and area of the 3-sided rec against the wall with its length being 120)

ty

2006-12-07 07:17:31 · 6 answers · asked by ~ B E L L A ~ 2

What is the main ingredient to portland cement and the minor ingredients. What is the base rock that is mined and how high is the heat used to process this rock to a powder for the cement? Before water and aggregate is added what are the other products used. What is the percentage in relation to the base? I hope these questions makes sense.

2006-12-07 07:17:07 · 3 answers · asked by the old dog 7

My helli is pretty big, I am using four 10mm leds, two white, one front, one back, one red left, one green right, I have a on board battery 5V, but I can put on a small axillary battery 12V, if I have to, I would like them to flash all that the same time, But this is no ordinary on–off–on–off flasher. I would like a "heart-beat" effect, blip-blip, pause, blip-blip, pause. for a double-blink roughly every second.
the spec for the leds are
Red X1 : Forward Voltage : 1.9v - 2.1v
Forward Current : 20mA
White X2 Forward Voltage : 3.2v - 3.6v
Forward Current : 20mA
Green X1 Forward Voltage : 3.2v - 3.6v
Forward Current : 20mA
does any one have plans to make this work? or a place where I can buy a board already made?
Thanks
John

2006-12-07 07:10:56 · 1 answers · asked by Anonymous

I've noticed the same gas stations will click the nozzle off or slow it down to where it only pumps a trickle till you hit your prepay amount. I.E. you pre-pay $10 on thursday and pump. pump slows down at $9.75 till it hits $10. Same pump friday slows down at $9.65. What factors does the machine account for to slow or stop the gas?

2006-12-07 07:03:59 · 1 answers · asked by sedition_4_2_0 2