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Has any solar sail/motor type of device has ever been built and worked on earth, experimentally ? Sort of a Crooke's radiometer, with the radiation-pushed half of a spinning sail exposed to sunlight and the returning half shaded, all perhaps in high vacuum ? If half the globe of a Crooke's radiometer is shaded, would such be an equivalent of a solar sail motor ?

Thanks. Of course, it is high frequency AC; but AC fed solenoids/relays/electromagnets do sustain attraction when energized. I would have to try myself if nobody else on the forum uses such cooktop. Seems 340 alloy is the convenient one.

Seen advertisements where the ferromagnetic cookware used on induction cooktops turns the cooktop power off when pulled away from the 'burner' by some built-in sensor. Am fine with that. If the energy is magnetically transferred to a ferromagnetic pot; how can the pot be effortlessly lifted without the attraction force impeding the action ? How does it work ? Question 2 : What stainless steel alloy is more convenient for induction cookware that will be used suspended 3 mm above the induction cooktop suface ?

From experience, it is a product that perfoms. If its price is justified, depends on your application you did not expose. Sheets of different dimensions show at ----> http://www.ebay.com/bhp/sorbothane-sheet ; but you never mentioned size you want. Plain consumer insoles of gel or sorbothane seem more expensive than sheets. Shock "resistant" and shock absorbent are different animals, and simple to do a test, with the materials you mention, or a sandwich of those fancy gels. A plain lead bar can do wonders too.

Search for sorbothane products. Their main site has some and applications too.

They sleep because are fed by people. They do not have to look/hunt for food by themselves. They practice symbiotic psicology for comfort with humans. Try not feeding for a while and will start climbing the walls to eat a bug...

Hi. This travel check list works very well for me all times. Improve it, add your items, delete what you like; print copies and should serve you well in the future. Just keep it where can be found when needed ============================================================ TRAVEL CHECK LIST ===Personal items: Comb, brush Cosmetics Dental care items Deodorant First aid supplies Glasses, lenses, cleaning supplies Hair dryer Hand, moisture lotions Insect repellent Medicines, vitamins Nail clipper Cologne, perfume Pocket knife, tools Prescription duplicates Cotton swabs, balls Razor, shaving cream Reading glasses Shampoo Sunglasses Sunscreen lotion ===Documents: Adresses Stamps Cheque book Credit, ATM cards Foreign currency Health card Insurance International driver permit Itinerary Passport, visa Pen, paper Telephone card Telephone numbers Picture identification Driver license Reading material Reservations Tickets Tour books Traveler cheques Vaccination certificates Wallet Work folders, documents ===Before leaving: Advise family of itinerary Advise police Advise neighbors to watch house Arrange lodging for pets Clear and set refrigerator Advise postal office to hold mail Leave keys at safe place Lock windows, doors, garage, attic, basement Mow grass Store jewelry, guns, valuables at safe place Set heat, airconditioning Set timers and lights Shut-off water supply mains Shut-off power mains Disconnect telephone Unplug electrical items to protect from lighting Stop newspaper delivery Turn off ice maker Turn off water heater Unplug major appliances Water plants

In Brasil, put to work for moving people at an airport . Interesting concept, the sail is exposed to air flow in a duct under the train, its 'mast' riding on a slot. Enjoy ----> http://www.aeromovel.com/technology.htm

Thanks, John. It is not about superconducting magnets. For the first case, any plain DC motor has field electromagnets, (unless uses permanent magnets) Like an engine starter motor.. ----> http://k7nv.com/notebook/ppinfo/13ef4770.jpg Been "absurdly inefficient" about a century, but that is the way they are. Electromagnets for the field. Modern motors are using permanent magnets more and more since better low cost magnets became available.

The fear of snakes has to be -Because they are deadly, -They have camouflage, -They lurk, -They are quick -And the risk of the time needed to identify if deadly (if you can tell) exposes you more to death. The sum makes the high level fear. If none was poisonous they would be not feared more than a lizard.

A DC motor has two windings, one for the rotor via brushes; and one for the stator to create the 'bias' magnetic field. Fed with separate supplies, the stator magnetic field consumes 1 Ampere at 10 Volts; and the rotor consumes 2 Amperes at 10 Volts. That is 10 + 20 = 30 Watt, and the water pump it drives rises a column of water 25 metres high. That same motor gets a transplant of its stator electromagnets, replaced with permanent magnets that produce the same exact magnetic field. Now the motor driven water pump pushes water to the same exact height of 25 metres high as before in the same time, consuming 20 Watts by the rotor. What is going on? -The same work in both cases with now less power demand- How stupid is to say the magnets are contributing with 10 Watts worth of power ? ... Or... saving 10 Watts worth of power ? What is the mathematical analysis ?

Hi. The leftmost in the picture is 30 months old, 15 inches tall. The rightmost is exactly the same age sibling, all his life kept in a sealed test tube, 2 inches tall. Both seem very healthy. The central one was captured being ~ 1 year old, living also well in a tight closed jar. -----> http://i588.photobucket.com/albums/ss323/Innernet/Junipers_zps94787729.jpg What impairs the growth but sustains life in the captive ones ? Lack of nitrogen getting in ?

I truly love and enjoy all kinds and colors of dead snakes. Two hours ago, the 18 month-new neighbor stepped on the tail of a copperhead while going to the back porch. Her mom is still in panic. -Did not bite-. I volunteered to mow her grass to calm her when she returns home by night.

Hi. Can PET be 'converted' into thermoplastic ethylene vinyl acetate EVA, polyamide, polyethylene, or polyolefin by some not too complex process ?

Asking the opposite would be more 'normal' ; that thread already exists... The brain size has an upper limit, so, In your opinion which animal is the most stupid of all ? Downward in scale, the tiniest brain should fall into insects and perhaps microorganisms, and opinions on the most stupid creatures can fall in a grey area, but, Do you have of a notable choice ?

Radar imaging of the Sahara desert shows rivers carved rocky soil underneath the sand. Where did all that huge amount of sand migrated from carried by winds, or was created and ended deposited there ? Is the sand depth currently increasing or decreasing ?

Hello. 1. Amps written on the Solar PV as 6 or 7 amps are 6 amps/hr? Or does it means something else? It is 7 Amperes. If delivers energy during 4 hours, will be 7x4=28 Ampereshour 2. How many hours will my solar panels take to charge my two batteries? (I understand that there is a solar charge controller in between to control) If you can give the calculation, I would really appreciate. From a halfway charged state, say 2 batteries at a point capable of only 100 Amperes each; At 7+7+6= 20 Amperes, should take 200/20=10 hours. At full sun. Not a precise answer but should help you. 3. What is required to charge battery - voltage or Amps or both? Is it correct to say that to charge my 12V 200 Amp battery, I would need to charge it with 12V 20amps for 10 hours? A single 12V battery should receive more volts applied to it than its current charge state, limited to 14 V for charging (28V for two) 3. Is 24V 7amp = 12V 14 amp? Yes, you can say that There is a few possible configurations for the items you have. The one I would chose would be as picture attached next. will supply 24V at 200 Amperes capability. Unless there is an error in the 'inverter' specifications being really 24VDC in and 120VAC out; I see no need for it applying the schematic above. If it really is 24VDC in and 120VAC out, just connect it to the bottom arrows in proper polarity. ======================================================================= Second way, attached below.. This will supply 12V at 400 Amperes capability, and uses your converter.

Is it known if all bodies there orbit in the same direction as the planets ? Is too much of a coincidence everything in the solar system orbits in the same direction, or is there a reason ? If an old planet existed in the asteroid belt and collided with a counterdirection 'visiting/errant' body; would that create an asteroid belt ?

Which way does the current members ranking works ? Any link to forum rules about it, please ? If not functioning, why not deleting such username titles ? If functional; what is the scale ? Thanks.

As never dealt with water wells... In my backyard there is a now unused water well, never seen or dug it, and a single (plugged to avoid dirt in) 2" black polyethylene pipe comes out of the ground. It was connected to the inlet of a now defunct plain pump + pressure tank that looks like this set: http://inspectapedia.com/water/JetPump020DJF.jpg House is on a swampy lowland From the type of pump; ---> Is it safe to assume it is a shallow well < 10m/30ft ? ---> It is safe to assume there is a non-return valve at the deep end of the pipe ? ---> Can anyone suggest a 12V DC pump to take its place ? Not much pressure needed, it is a single story dwelling. Not much volume needed, rarely two faucets open at the same time. Would this work ? http://www.amazon.com/FloJet-04325143A-Pressure-4-5-GPM-12-Volt/dp/B000O8F1SY/ref=pd_sim_sbs_sg_7

Hi. Watching videos on youtube, there is ocassional pauses as the real time 'play' can be used up by a slow internet connection, if am explaining properly. So I select a less 'demanding' resolution. I get more interruptions and slower 'spooling ahead' when a low resolution as 144 pixels is selected, than when -say 480 pixels- I thought the opposite; that requesting/demanding a lower resolution, more frames or more downloading ahead would happen for a given internet speed available, yielding less interruptions. ----> What may be going on ? Can someone explain it ? [ What I call 'spooling ahead' can be monitored by placing the tip of the mouse arrow pointer exactly on the red center of the traveling circle on the 'progress bar' at the bottom of a playing youtube screen ] ( Am running Linux + Gnome )

Did that yesterday. The "FBI" virus. I have two removable hard drives for my compfuser. Linux, and Vista. The Vista of course got it, and as I never use it, has been dormant-infected on a shelf for months, until I decided to fix it, after unsuccessful attempts trying my knowledge and lots of head scratching, Went to the public library, and did all this there: downloaded this .zip: ----> http://www.hirensbootcd.org/download/ Extracted all; Clicked on an icon that launches the .iso maker, and made an .iso CD loaded with Hiren's 15.2 boot CD .ISO Back home, inserted on the CD drive, and flipped on to boot from it. - Loaded "Mini XP" from the menu, - Chose to run "Malwarebytes" in both scan options, It is gone. Good luck, come back with findings/results. Edited...OH boy... this thread is months old but should work for someone, sometime...

Jealousy, vain, selfishness, intimidation; are words that come to mind in my not very good English language knowledge; perhaps other words could choose more proper terms about the scenario behind the first 4 commandments. In proper English, does any one perceive better adjectives ?

Thanks. With those small figures, it is not worth the trouble at all. Good for puttting the speculative question to rest; shows that solar collectors on a roof are far better choice; and that the nuclear industry is doing the proper action in guarding and putting away the spent material.

Hi. Not a subject I know enough about. One kilogram of typical spent nuclear fuel; as put aside to cool and later to storage by the energy industry, if had to be used to warm-up a dwelling in winter... How many Watts would produce for how long? ( If its radioactivity was properly and safely contained, only releasing safe heat, in a world populated with only good angels and no risk of falling onto crooked minds )