Engineering - October 2006

I'm doing a written lab report (kind of a project) but it's due tommorrow!
Its basically about pendulums. A pendulum is.... well...Ok. It just like if you have a string attached to something and then you let it loose. It swings back and forth. That is a pendulum.
The Lab Report is about testing three different hypotheses. One is aoubt how the heavier the pendulum, the longer the period. Period equal time/swings. The next is about the longer the string, the longer the period. The last one is about the angle that the pendulum is released. The higher the angle, the longer the period.
SO. I need an appropriate title and I'm counting on all you ever so ingenious people to come up with one. It doesn't have to be long, but not too short. I'm only need a title so DON't go the extra mile to blah blah. In theory, good title+why that title = best answer.

2006-10-02 11:24:28 · 7 answers · asked by Anonymous

2006-10-02 11:13:10 · 1 answers · asked by Michelle L 1

And what are the different disciplines within civil engineering?

2006-10-02 10:51:43 · 8 answers · asked by Anonymous

2006-10-02 10:41:16 · 13 answers · asked by benneth 1

What is name of the type of switch which switches an electrical current from an incoming set of wires to either an outgoing set A or outgoing set B of wires?

2006-10-02 09:55:18 · 10 answers · asked by RT 5

2006-10-02 09:39:49 · 6 answers · asked by TomKat 1

Just a little quiz to see who's clever

Electrical demands: 7,500,000 kilowatt hours yearly with 580,000 exclusively for the illuminations. Eighteen transformers handle the flow of current and in case of breakdown, 3 electrical groups will automatically take over. More than 100 bulb models are represented in the 10,000 that light up the illuminations. The electricians must regularly change them, a task that involves climbing the structure itself. The entire installation relies on a network of 80 kilometers of electrical cables. Furthermore, 65,000 square meters of drinking water and 705,000 kilowatt hours of cooling and heating are also necessary annually.

2006-10-02 09:02:44 · 10 answers · asked by Chippie 2

Hey all,

I am working on a project, and it has to be human-powered. I need your guys opinion on what is the best way to store electricity/energy generated from human-powered bike? I was just thinking using whole bunch of rechargable batteries. Also what about alternatives, like is there a way to split the power generated from the bike in to two channels? Meaning one channel directly goes to the batteries (or other better option to store) and other goes directly into use..

This has to be compact too.

Thanks for your inputs.

2006-10-02 08:39:42 · 4 answers · asked by Sowatup 1

2006-10-02 08:30:58 · 4 answers · asked by nevairtudino 2

I have this design homework, where i have to design a biased circuit for a 2N3904 npn bipolar transistor with 5% tolerance resistors.
Here is what the circuit should look like. With a few changes, Vcc is 15V, Rc=0 ohm and the design is to give a nominal collector current of 1.2 mA. Unknown are R1, R2, RE.

http://i115.photobucket.com/albums/n288/johndoe_00/cir1.jpg

I need to design it based on worst case max and min to get a good design. Since i have to consider 4 factors ( beta,R1,R2 and Re). I also dont know what info i need of the datasheet. I need some help, i'm totally lost and confused on this problem.

2006-10-02 07:27:38 · 4 answers · asked by Anonymous

we need to replace failed medintech tandem due to moisture caused failure. the slab has been treated with Creteseal, the cracks chased and filled with ardex and replaced the floorcovering 5 yrs ago.
The cracks are opening allowing moisture to collect under the vinyl.

2006-10-02 05:42:20 · 3 answers · asked by timschristmastrees 1

2006-10-02 03:36:53 · 1 answers · asked by Jason P 1

Has anyone ever used all the energy generated by people using equipment in a gym or fitness room to provide power for a building? If not, could this be a practical possibility?

2006-10-02 03:11:09 · 7 answers · asked by Rozzy 4

Coal based power plant of 210MW generation capacity emits flue gas at a rate of 900tonnes per hour. If CO2 is captured from this capacity of gas, based on amine absorption technology, the reboiler of the amine regeneration column requires heat supply at 190MJ/second as per the simulation results.Considering this as the additional total energy requirement for the CO2 capture process, how much power can be actually generated?

2006-10-02 03:11:04 · 4 answers · asked by energyconscious 4

we have an engine runs well but when due to some protection, controller unloads it and reapplies load--the fire comes out of stack momentarily--what could be reasons -Is it issue of fueling at that moment or issue of improper turbine pressure- we are also seeing exh valve breakage on the engine too after a service of 16 months

2006-10-02 02:54:43 · 6 answers · asked by w111 t 1

2006-10-02 02:38:09 · 3 answers · asked by Anonymous

2006-10-02 02:17:07 · 4 answers · asked by Zab Ragga 1

2006-10-02 01:04:18 · 1 answers · asked by munnawer 1

2006-10-02 00:54:19 · 10 answers · asked by Anonymous

I have made a small, generator more generating a small amount of energy. But I hv a problem. I forgot to attach a rubber band between the 2 pulleys. I also want to add something so that this moves continuously without human effort for a longer time.Pictures are not allowed with the questions. So, I hv attached a link to it.--http://fullgames.freewebpage.org/Photos/

2006-10-02 00:52:36 · 4 answers · asked by Anonymous

2006-10-02 00:36:55 · 4 answers · asked by samira s 1

2006-10-02 00:19:13 · 5 answers · asked by Anonymous

2006-10-01 22:03:35 · 2 answers · asked by TOPS 1

How do we find the natural frequencies of a cantilevered plate

2006-10-01 21:21:13 · 2 answers · asked by faisal.siddiqui 1

My degree would be from USC(university of southern California) and I am planning to get my PE in next 3 years.
I have one mastres in Geothecnical engineering
and will have a PhD in structural engineering
Assume that I may not work in the direct area of my research.
Thanks for you responses before hand.

2006-10-01 19:43:46 · 3 answers · asked by Mike 1

2006-10-01 19:34:03 · 3 answers · asked by tehaye92 1

Please explain the relation between Volts and mA

2006-10-01 18:37:16 · 1 answers · asked by bernardo_miranda_perez 2

I'm repairing a Switching Power Supply. It has HIGH voltage DC circuit @ 320VDC. There are two "chopper" supplies. The 12VDC is the primary output. The 20VDC is for the chopper circuit, a TL494 chip. All semi test fine with Ohm meter. There is no Vcc on the TL494 when plugged in so the chopper never runs. I can "jumpstart" the TL494 by momentarily applying external 9VDC to Vcc and Grnd. Supply runs fine w/o battery after that until unplugged.
Brand: HANNY Model: FX-101
No schematic or tech support available. The problem is the initial startup. How does HANNY design the startup for their switching supplies? Is it a mini linear supply? A starting resistor? A starting cap? Self resonance? What do I look for? Checked power resistors, all in spec. What can I look for? Supply is only five months old, likely not dried caps. Ideas?

2006-10-01 17:01:22 · 3 answers · asked by hack_ace 4

How much power does it take? What components does it use? Can you buy just the vibrating portion? How much does it vibrate/move?

2006-10-01 16:50:33 · 1 answers · asked by ee 2

mechanical seal

2006-10-01 16:44:01 · 7 answers · asked by madad5757 1