Engineering - November 2007

What do you exactly?

2007-11-05 20:04:06 · 1 answers · asked by Anonymous

I hope Anyone who has sound knowledge in Electrical engg. Can only make a suggestion for the following question! I also need simple illustration. I must generate 200 watts of Electricity. But i have only these details.
1. Crank shaft pulley dia 8 cm.
2. Crank shaft speed 700 rpm.
3. 2 kg of force acting on the crank shaft.
4. Crank shaft length - 15 cm.
If I connect the crank shaft to an ordinary car alternator, will it be able to produce 200 watts?
I know nothing about Elec. Engg. So please make a good suggestion how to produce 200 watts.

2007-11-05 19:51:18 · 2 answers · asked by Mani 1

if the capacitance of a capacitor is x farad, then how do i count the total current release if the capacitor fully discharge in an instant? Can someone tell me the formula or any method on how to count it?

2007-11-05 19:46:40 · 4 answers · asked by John Terry 2

2007-11-05 19:21:24 · 3 answers · asked by snow 1

What will happen if all the appliances listed are used on the same 15 a circuit at the same time.


1)a 1200 w stream iron
2) a 600 w, teo-cup coffee
3)a 60 w stereo
4)a 40 w lamp



EXPLAIN PLEASE

2007-11-05 18:39:16 · 4 answers · asked by Anonymous

1) 1200 w stream iron
2) a 600 w, two-cup coffee maker
3) a 60 w stereo
4) a 40 w lamp

2007-11-05 17:32:37 · 5 answers · asked by Anonymous

if i were to construct a big cage made of metal pipes, and put it on my roof and ground it with heavy gauge wire, could i sit underneath it safely? would all the current go to ground?
the cage would be like a lot of pipes in a row, all connected together and grounded. there would be no walls, it would just be a metal pipe roof, if you could imagine. maybe like 20-30 feet high off of my roof.
don't just say no, only answer if you actually know the answer. and if it's not safe, how could i make it safe?
this is just an idea, i probably would never actually do it.

2007-11-05 15:55:48 · 1 answers · asked by Alex 3

Give somtin of ur imagination man
think anything just make it fast
plasma gun , laser guns,etc

2007-11-05 14:38:00 · 2 answers · asked by antigravityashwin 1

ok, please follow the link. you'll see an 11" HID spotlight. it runs for 3-4 hours, produces 2900 freakin lumens, and yet still only costs like $120. Most hid lights that are that strong, should cost a lot more, can u see a catch?

2007-11-05 14:20:22 · 2 answers · asked by Anonymous

I broke my boss's stirling engine display this morning. I need to replace it before he returns from his overseas trip by this Friday. To place an order online and wait for delivery takes too long. Anyone out there knows where I can walk in and buy a stirling engine model in Singapore or Hong Kong? Thank you!

2007-11-05 13:12:29 · 1 answers · asked by Anonymous

2007-11-05 12:12:03 · 4 answers · asked by jim m 5

After falling downhill for half of the trip, how much further would it go uphill using its kinetic energy? (Assume magnetic suspension.) If the heat energy picked up underground could be used to charge batteries, could it make the whole trip without using external energy?

2007-11-05 10:33:20 · 4 answers · asked by marvinsussman@sbcglobal.net 6

I am working on this paper for Chem and would really appreciate some helpful opinions etc regarding nuclear technolgy.

2007-11-05 10:07:04 · 3 answers · asked by Flames Girl 3

Im in a confusion. Imagine if two objects were squashed when dropped and both returned to their original states.
However, one of them deformed less in comparison to the other before it returned to its original state.
Does this mean that the object that deformed less is more elastic, does this also mean that it will lose less energy to the surroundings?

2007-11-05 09:53:25 · 5 answers · asked by saman-a-man 1

give me a link please

2007-11-05 09:32:26 · 9 answers · asked by black 2

2007-11-05 08:37:39 · 3 answers · asked by JEROME B 1

2007-11-05 07:54:39 · 4 answers · asked by jnsane84 1

What would it be and is it better and cheaper and what can be done to get it started?

2007-11-05 07:40:41 · 4 answers · asked by R J 7

There is a solar system that make the water hot in summar. I am thinking about a way to save the heat energy to use it in the winter.

2007-11-05 07:23:04 · 5 answers · asked by Amiraan 4

2007-11-05 07:13:32 · 27 answers · asked by gizzle 1

16" unlined ductile iron pipe, ID = 17.1", OD = 17.4"
Starting water temp = 50 °F
Ambient air temp = 7 °F
Therm cond of ductile iron pipe, k = 36 W/m K
Heat loss, Q = -kA(T2-T1)
A = surface area of pipe per meter of pipe = PI*(.5*OD)^2 = 0.15 sq m / m of pipe
Q = -36*0.15*(283-260) = -132 Watts/meter of pipe

Now calculate the time it takes to cool the mass of water in 1 m of pipe from starting temp
Of 50 °F to 32 °F

Time to cool = Q / heat capacity of water / mass of water per m of pipe / (273 K – 283 K)
Where
Heat cap of water = 4200 J/kg per degree K
Mass of water in 1 m of pipe = 148 kg per m of pipe
Freezing point of water = 32°F = 273 K
= 13 hours

Now, determine the time to freeze water at 32°F

Time = Q / latent heat of fusion for water / mass of water in pipe per meter
Where
Latent heat of fusion of water = 334,000 J/kg
= 104 hours
Total time to cool water from 50°F to freeze it is 13 hr +104 hr = 117 hr, this seems too high

2007-11-05 07:11:12 · 1 answers · asked by Jim K 1

I have a resistor that is reading 500 ohms (instead of 1K ohm) after an over-current, the color code is burn so I cannot identify if the original value was 1k or not.
Is there any possibility that a resistor reduce its value?

Thanks

2007-11-05 07:07:55 · 3 answers · asked by rafael 1

is there a way to make a device that can kill electricity such as a gun that sends frequency to kill an electricity for cars while car is running?
If so, how can I do it?
how much will it cost?

2007-11-05 07:05:22 · 5 answers · asked by sungil 1

I can make a square. but that is nearly 4 lines making a polygon. how do i make cad understand that the square is a peice of steel and has a width?

2007-11-05 06:41:56 · 5 answers · asked by Anonymous

What is the final system reliability (in %) of 2 identical components in parallel whose individual reliability is 85%?
Please explain and thank you in advance.

2007-11-05 06:38:31 · 1 answers · asked by 037 G 6

2007-11-05 06:32:24 · 1 answers · asked by Patrick b 1

2007-11-05 06:25:51 · 3 answers · asked by hally j 2

2007-11-05 06:14:21 · 2 answers · asked by Anonymous

The metal is for a capsule going to the centre of the earth - please help!!!!!!! Its really urgent!!!!!!

2007-11-05 06:01:03 · 4 answers · asked by Anonymous

2007-11-05 05:12:46 · 6 answers · asked by Big L 1