Engineering - November 2007

you know, those big window 3 speed fans. I assume nowhere near an AC. Would it even be more or less electricity used compared to keeping a lamp on?

2007-11-03 13:27:39 · 3 answers · asked by Anonymous

2007-11-03 07:26:19 · 6 answers · asked by lord_andys_new_id 1

I want to convert my dory into a peddle-boat by mounting a recumbant bicycle onto the boat and running a variable pitch propellor through a drive shaft. How can I convert the rotational force of the bicycle in the vertical plane (like a bike wheel spinning) to the transverse plane (like a propellor turning)?

Could this be an efficient method of propulsion? The only pedal boats that I have seen are those very inefficient pontoon boats on ponds. Why isn't pedalling used more as a propulsion system in a boat - it seems to me an under-used strategy.

P.S. - I like rowing but I hate facing backwards all the time.

2007-11-03 06:24:34 · 2 answers · asked by megalomaniac 7

Maybe it would be financially unviable to make aeroplanes out of this material- but then why have a health service that costs billions of pounds to run?

Or, maybe it would be far too expensive to build engines that could withstand the increased weight of the aeroplanes- but how much does it cost to replace the aeroplanes that are destroyed during crashes and improve the design of engines to attends to defects etc. and limit the contribution they had to the crashes in the first place?

2007-11-03 05:25:37 · 16 answers · asked by ►Aurora Borealis 5

2007-11-02 20:20:18 · 7 answers · asked by deepak_8584 1

the value of of a resistor is measured by the voltmeter-ammeter method. the internal resistance of the voltmeter is 200ohms. when the voltmeter is connected directly across the resistance to be measured, then the ammeter reads 10a and voltmeter 100v

2007-11-02 20:01:59 · 5 answers · asked by Anonymous

i have need job in european countries

2007-11-02 19:14:48 · 5 answers · asked by sj 1

Can anyone explain the syminotronics of this area? It's driving me crazy.

2007-11-02 19:05:59 · 3 answers · asked by Anonymous

hi, i'm trying to build my own Quad rotor UAV. I've brought all the component, the motor, accelerometer, gyros, the frame and the rotors. Is there any1 out here can tell me how can I interface all the component together??? I don't know how to programme the PIC and how to connect all the component......PLease help!!!!
Thank you

2007-11-02 17:37:58 · 2 answers · asked by blue_dinosour 1

I'm trying to build a robot that drives on the ground and occasionally encounters a wet surface. I need to improve traction to handle the wet surface. My immediate intuition leads me to simply widen the tires, but knowing F = uN, I don't see how surface area of the tire helps any? I know increasing the coefficient of friction or the normal force will improve traction but could someone enlighten me as to what effect a wider tire would or would not have. Thanks.

2007-11-02 17:05:07 · 1 answers · asked by mrlexington 2

I don't want stupid answers from people just wanting points. Is a standard light switch where you push the switch up/down a lever in scientific terms?

2007-11-02 16:04:06 · 9 answers · asked by panda1234 2

I teach college classes part time, and am discouraged by how many high school graduates are so poorly prepared for college. I am concerned about our ability as a nation to compete in the future.

2007-11-02 15:13:06 · 14 answers · asked by don1862 4

needs to block fm signal from close range, i know its illegal but its in the name of science.

2007-11-02 15:08:35 · 4 answers · asked by Mike D 2

I am wanting to explore robotics, and am wondering what would be an easy starter project in order to build my skills. I was an engineering student, but I decided to give that up because I wanted to actually learn and explore the engineering field instead of just read books about it and do math problems. This project shouldn't be too expensive, and should provide for future expandability. Any ideas?

2007-11-02 14:22:17 · 4 answers · asked by Confused about life 2

It can only have 1 rubber band and can't have commercial parts or come off the ground... and I need to know how i can get it to move with the elastic and a design!

2007-11-02 12:40:39 · 2 answers · asked by Anonymous

2007-11-02 11:40:38 · 3 answers · asked by Neo Tarantula 2

(a) A very powerful vacuum cleaner has a hose 3.05 cm in diameter. With no nozzle on the hose, what is the weight of the heaviest brick that the cleaner can lift?
N
(b) A very powerful octopus uses one sucker of diameter 3.05 cm on each of the two shells of a clam in an attempt to pull the shells apart. Find the greatest force that the octopus can exert in salt water 32.3 m depth.
N

2007-11-02 10:28:33 · 1 answers · asked by Anonymous

There is a 3.7 mass on a frictionless inclined surface and is connected to a 2kg mass. The pulley has no mass or friction. The 2kg mass is acted upon by an upward force of 3.9N, and a downward acceleration of 4.6m/s^2. I found the tension in the connecting string and it was 6.5N what I don't get is how to find the angle please help me with this someone else tried and they did 4.6=gsin, but that was wrong and I don't think the other person is going to answer. Please help me.

2007-11-02 08:51:03 · 1 answers · asked by tanya 1

2007-11-02 08:34:26 · 1 answers · asked by Anonymous

Using the 3-4-5 method if I measured out 18 feet on one side of the angle and 24 feet on the other angle, if the 3rd side equals to 30 will the corner be square? all three numbers being a multiple of 6. I kinda understand using smaller numbers like 12, 3x4=12 and 16, 4x4 =16 and 20 5x4=20 but I'm confused when using larger numbers. This builder use 26, 28, 35 how does that work. the corner I'm trying to measure is 26'10" by 30'10 " a little bit bigger than the acual foundation.

2007-11-02 06:40:38 · 4 answers · asked by kim s 1

2007-11-02 05:01:33 · 6 answers · asked by dubwise_15 1

2007-11-02 04:03:35 · 3 answers · asked by chaindropz 4

I am a metallurgical engineer having experience in material testing

2007-11-02 03:20:56 · 3 answers · asked by Anonymous

im an under graduate interested in undertaking these projects for practical knowledge

2007-11-02 02:47:45 · 1 answers · asked by shiva r 1

2007-11-02 01:35:39 · 3 answers · asked by chinese_helicopter 2

electronics software

2007-11-01 21:44:24 · 1 answers · asked by shaheen 1

"allternative walling materials for multi story load bearing construction"
frm which web sites can i get information abt that title??

2007-11-01 17:30:01 · 1 answers · asked by B G 1

doesn't say on the package.

2007-11-01 16:33:12 · 4 answers · asked by staggerlee917 2

Also If i have a value that is work/s how do i convert that to kilowatt/hours?

Also why should a power company be called an energy company?

2007-11-01 16:17:14 · 3 answers · asked by maxk222 1

Sorry to ask such a question, but our study group is at a loss as how to continue and our homework is due tomorrow. So here goes:

In order to receive credit we MUST use calculus techniques:

We have a piece of wire that is 100cm long and we're going to cut it into two pieces. One piece will be bent into a square and the other will be bent into a circle. Determine where the wire should be cut so that the enclosed areas will be at maximum. Note that it is possible to have the whole piece of wire go either to the square or to the circle

2007-11-01 16:12:37 · 4 answers · asked by pyrojelli 2