2006-09-06 13:49:59 · 5 answers · asked by george h 2 in Science & Mathematics ➔ Physics
Pressure-Air which would normally fill the glass as the water escapes is pushing up against the card.
2006-09-06 13:56:29 · answer #1 · answered by phoephus 4 · 0⤊ 0⤋
Hydrogen and oxygen have nothing to do with it. Of course you hold the card in place as you turn the glass over, so the speed of turning it over (and the centrifugal forces) are also irrelevant.
Once the glass is inverted you can see a space between the water and the bottom (top) of the glass. The water stays in the glass because of that space, which is almost a perfect vacuum.
2006-09-06 21:18:08 · answer #2 · answered by ? 6 · 0⤊ 0⤋
It's called syntriphical force. I think I spelled that right. Probably not but here's another version-cintrifical. Why do you stay in the seat on a roller coaster when you go upside down? Syntriphical force. It also has something to do with the gases and all that kind of stuff but if you don't do it fast enough the card, not to mention the water, will drop out.
2006-09-06 20:57:30 · answer #3 · answered by indigonipple 3 · 0⤊ 1⤋
14.8 lbs of air-pressure is pushing upward on the card.As long as the water ( coffee, whatever ) is filled right to the brim as so there is no air between the card and the glass it will work. You can also set a booby-trap by setting the glass down on a counter and removing the card (menue ) .. When someone picks it up ........ whoooooooops !
2006-09-06 20:59:54 · answer #4 · answered by pocono58 2 · 1⤊ 0⤋
gas created by hydrogen and oxygen are the contributing factors in why the note card stays, mostly the water creates a slight vacuum suction when flipped over quickly
2006-09-06 20:54:24 · answer #5 · answered by slkier_2000 1 · 0⤊ 0⤋