Can anyone tell me why a paper strip rotates longitudinally when released freely in air?
548693
Chaos theory, too.\n\nTiny variences in temperature, air pressure, the paper,  etc...  (trillions of variables)\n\nIf you could control all variables, including a perfect release the paper would fall without rotation to the ground.  But if one tiny variable is off, its anybodies guess!
411921
stroboscopic effect. This happens when light source flickers. When the frequency of rotationg object and light source match; the rotating object appears stationary. This effect is used in news paper press to read printing defects on very fast progressing printed material. When the frequencies differ; the rotating object appears rotating with speed that is difference of the two frequencies. (light source freq - object freq * number of blades). If the light source frequency is more than that of object, it appears rotating in opposite direction in certain conditions. This depends on number of blades.
677899
yes we did it in science class.  I forget how exactly but you fold the paper and then start cutting tiny rows but everyother row you change directions and then open it up when you are done and you get a loop of paper like a hoop and then you can step through it.  E-mail me for more details at fairy_dust_xo@yahoo.com  Hope this helps!
1098861
a copper disc works also, When spinning fast the magnetic field is reflected back and the magnet will float off.
143481
could be that your printer settings have too much of a margin on the top and bottom of page(s).\nor\nmaybe, just maybe, you may have not removed the plastic lining from the bottom of the print cartridge, however most printers, HP, will tell you that the protective wrap is not removed.\ngood luck with your problem.
898058
Its the ratio of the lengths.\n\nIts balance of angular momentum, so the length from the hinge and the forces exerted must be equal.\n\n10 N exerted upward at  2 cm from the fulcrum means that the downward load 2mm the other direction from the fulcrum is associated with a load of 100 N.\n\nYou may not have noticed, but there are special force concentrating deformations in the surface near where the tab presses.  That makes it fail at about 1/2 to 1/3 the load it would otherwise fail at.
38582
I realize I am out of my league as far as physics,, but the image reflects directly back to the source in front of it. For the reflection to appear upside down or vertically mirrored the light would have to be bent.\n\nok looked it up.  It is because of the predicatable behavior of light known as the law of reflection
571588
There are layers to the strips.  A lamination defect is where one layer did not bond (either through lack of contact (through insufficient pressure) or insufficient heat).\n\nMost of the time, this means the rollers need to be adjusted.
137603
Consider  one small part of the dancing string:\nelastic energy <==> kinetic energy.\nThe sum of both is mechanical energy.\nIt is supposed to be constant.\n\nOnly the friction of the air damps the oscillations.\nMechanical energy ==> (friction) heat\nThat's all foulks!
305142
The static charge builds up on the comb. When the comb is rubbed on the flannel it picks up some of the flannels positive charge. The paper has negative charges on the outer layer thus opposites attract and voila have static cling.
1113264
it could be paranoia. I tear mine becuase i read somewhere that the ripping of paper is calming. And if you focus on the sound, it truly is.
835181
it's got two aspects to it- thw molecular make up (natural cellulose and synthetic polymers) but the easiest explaination is this-\n\n    when u tear paper, the bonds break and molecular collision takes place. all this creates energy which is dissapated as sound energy (tearing sound)\n     wheras when you try to tear plastic, you will find that instead of simply tearing up, plastic paper stretches. this is because it is made of synthetic polymeric reactions. so, the energy which is released is not released in the form of sound energy, but it is released as heat. you will note when you try ti tear plastis sheets that it will first stretch, become warm and then kind of 'pull away' from the bulk sheet.
762824
The answer to this is actually pretty simple - and it applies to the Christmas lights, too.\n\nThe cable (or wire) that the signal passes through is formed of multiple strands of much finer conductor, twisted to form a (relatively) uniform outer surface to which the insulating jacket is bound.\n\nOver time, you'll tend to pull the cord into longer and longer lengths ... with one of two results. Either the twist gets tighter (and the cord appears slightly thinner), or the twist gets looser.\n\nIn either instance, the "memory" of the wire will want to try and return it to its initial configuration (including tightness of twist). Once the stress is off the conductor, back it goes! And probably snarls itself in the occurrence, because you've tried to pack it away in the EXTENDED configuration.\n\nKnotting is another phenomenon entirely. In this case, relative motion of the gathered conductor bundle tends to "slip" one loop against the next. In the extreme, what used to be the outside loop becomes the inside loop ... and you have a potential knot. Unknowingly, you reach in and grab the "new" inside loop and pull ... thereby completing the slippage and you now definitely have a knot!
511989
Because of the rotation all the molecules in the ring separate a little bit. So there is more tension. The reasen is, that all the molecules need more centripetal force.
680797
Paper is insoluble  in water.\nPaper is made from wood - plant fiber.
202743
I think its the toner problem. I think its not rotating. So call manufacturer for more info
109753
A mobius strip? or maybe Rotational Stability? It's an analysis of "wobbling", exhibited by common objects (coins, bottles, plates, etc) when they are spun on horizontal, flat surfaces. The object maintains a "wobbling" motion of a cylinder, which can be observed in slow motion by means of stroboscopic illumination.