Pie are round foo! CORNBREAD R square...dacflyer wrote:i still say Pi R round
Search found 63 matches
- Mon Mar 23, 2009 9:24 pm
- Forum: General Discussion
- Topic: Happy Square Root Day, everyone!
- Replies: 5
- Views: 4158
Re: Happy Square Root Day, everyone!
- Sat Aug 04, 2007 6:10 pm
- Forum: General Discussion
- Topic: Wireless energy transfer over several feet at 50% efficiency
- Replies: 8
- Views: 6649
- Fri Aug 03, 2007 1:04 pm
- Forum: General Discussion
- Topic: pine trees attenuate satellite dishes
- Replies: 9
- Views: 7032
- Fri Aug 03, 2007 12:57 pm
- Forum: General Discussion
- Topic: Wireless energy transfer over several feet at 50% efficiency
- Replies: 8
- Views: 6649
Wireless energy transfer over several feet at 50% efficiency
Just heard a guy (Graduate student in physics at MIT, Andre Course (sp?)) on National Public Radio talking about recent research. They are now able to light up a 60 watt light bulb about 8' away from a wireless power source. He claims the new technology will have a conservative efficiency of 50% and...
- Fri Jun 22, 2007 1:14 pm
- Forum: General Discussion
- Topic: Will cars ever run on pressurized air?
- Replies: 61
- Views: 30450
I remember seeing a picture of a mining locomotive that used compressed air. This is one application that actually makes sense. It looked a lot like a conventional old fashioned steam locomotive, but had a big tank where the boiler would normally be. Somebody bought it at scrap value and later made ...
- Wed May 09, 2007 1:06 pm
- Forum: General Discussion
- Topic: air conditioner pre cooler
- Replies: 42
- Views: 24111
While compressor coils are built for outside environment, and spraying water on them is a quick way of cooling them off in a hot dry envlronment, there can be problems. Mineral and salt buildup on the coils from the evaporated water can be a problem. Also a problem is the combination of copper coils...
- Fri Sep 22, 2006 12:22 pm
- Forum: General Discussion
- Topic: LED Tea Light Candle
- Replies: 13
- Views: 10439
No Dean, they are not used for warming food. Just a warm glow. Restaurant supply stores sell electric ones to replace the little votive candles. Some of the votive candles last 24 hours, and are about 2 inches high. The battery powered versions probably last for many days. They are popular in some r...
- Fri Sep 15, 2006 1:11 pm
- Forum: General Discussion
- Topic: we just GOTTA come up with a design challenge..
- Replies: 9
- Views: 6877
1. CNC or stepper motor projects would be welcome. 2. A distance meter project using a hack of the Stanley FatMax True Laser Measurer. To collect distances and output the numbers into a computer or USB cord or thumb drive. As an architect I got a fatmax device for about $100.00 and it works well eno...
- Fri Sep 15, 2006 12:54 pm
- Forum: General Discussion
- Topic: Very far-fetched pre-project...
- Replies: 23
- Views: 14269
Sound is fairly useless in the audible range at least. For these purposes. If I remember correctly, high frequency sound (in the audible range) is very directional, but can be stopped by a very light piece of material. Low frequency sound (in the audible range) penetrates deeper and into heavier mat...
- Wed May 03, 2006 5:23 pm
- Forum: General Discussion
- Topic: Measure electric fields underwater...
- Replies: 9
- Views: 6944
Hammer Head Sharks special head shape helps them find animals under the sand by electric field. A great white shark in captivity was found to bang into the side of the concrete tank wall almost every time it tried to swim around. It turned out there was an electrical anomaly there due the way the st...
- Tue May 02, 2006 5:19 pm
- Forum: General Discussion
- Topic: Similar to a solar cell...
- Replies: 16
- Views: 11237
Using an antenna to harvest electricity may be free, but not without cost. And it could be illegal. You could probably use an old wire fence near a high voltage transmission line, disconnect the ground and get power, but it would be stealing, and you would be caught. Someone's thought of that long a...
- Tue May 02, 2006 9:00 am
- Forum: General Discussion
- Topic: 6 Farad Capacitor as scooter battery?
- Replies: 11
- Views: 8362
Now I know why. Never was that good at math and thought we'd wing it this time. Was hoping 6 Farads would at least be a sizable ride. 100 mfd used to seem like such a large capacitor, I was blinded by size and let hope take over. Motor is probably 200 or 300 watts. Eventually wanted to use it on an ...
- Mon May 01, 2006 10:51 pm
- Forum: General Discussion
- Topic: 6 Farad Capacitor as scooter battery?
- Replies: 11
- Views: 8362
6 Farad Capacitor as scooter battery?
I tried hooking up a 6 farad capacitor <http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=9715034171&rd=1&sspagename=STRK%3AMEWN%3AIT&rd=1> to an old Zapworld.com scooter, but it doesn't seem to work at first crack. The capacitor is 12-24 volt capacity, and has an automatic shutoff ...
- Thu Mar 02, 2006 5:19 pm
- Forum: General Discussion
- Topic: A&E show called MindFreak with Chris Angel
- Replies: 6
- Views: 5076
Re: A&E show called MindFreak with Chris Angel
The bulb trick was probably done with a couple long hairs or nylon thread.
Any technology sufficiently advanced (to a particular audience) will be regarded as magic. Especially if it is insuficiently explained or insuficiently understood by the audience, or if they are carefully misled.
Any technology sufficiently advanced (to a particular audience) will be regarded as magic. Especially if it is insuficiently explained or insuficiently understood by the audience, or if they are carefully misled.
- Thu Mar 02, 2006 5:11 pm
- Forum: General Discussion
- Topic: Mechanical equivalent of impedance matching?
- Replies: 10
- Views: 7133
Re: Mechanical equivalent of impedance matching?
How about "sweet spot"?