2007-10-24 01:58:46 · 7 answers · asked by TAGQuestion 1 in Science & Mathematics ➔ Physics
The length of the straw can be calculated (exactly) only the following information also known:
(1) The straw is used in the sea level or on top of any mountain.
(2) The density of the drink
(3) The straw is held vertically or little slant (as usual).
Anyway, I presume that the straw is used at the sea level, to drink water and held vertically.
The liquid rises through the straw because of the atmospheric pressure at that location. The atmospheric pressure at the sea level is equal to the pressure exerted by the mercury column of height 76 cms. which will be equal to hdg newtons. The equivalent height of the water column can be calculated as under:
hdg (mercury) = hdg (water)
.76 x 13.534x10^6 x 9.8 = h x 10^6 x 9.8
h(water) = (.76 x 13.534x10^6 x 9.8) / (10^6 x 9.8)
...............= 10.28584 metre=33.764 feet
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2007-10-24 04:39:05 · answer #1 · answered by Joymash 6 · 1⤊ 0⤋
If you use the straw traditionally by sucking on it and you hold it vertically and its a pretty strong, then 10m is the theoretical limit to the length of the straw above the liquid surface. If you use the straw at an angle there's no theoretical limit.
In practice there are a fair few ways around this answer. For one any length under the liquid surface doesn't count toward limitation so you're unlimited there. A second one is that you can't suck all that hard so in practice the above 10 m would only be around 1 m for most folk.
Bramble
2007-10-24 02:20:10 · answer #2 · answered by Bramble 7 · 1⤊ 0⤋
DanE is partially correct.
About 32 feet (9.75 meters) above the surface level of water is hitting the theoretical limit. Because at that point the pump would have to to have an absolute vacuum.
1 atm = 760 mm of mercury
1 atm = 10.286 meter of water (33.8 feet)
(note that the density of the fluid will determine the height above which you can't pump)
see Atmospheric pressure based on height of water in ref below
2007-10-24 02:10:39 · answer #3 · answered by Edward 7 · 1⤊ 0⤋
If we try to pump water by suction up an open tube we can raise it 32 feet - at that point cohesion is lost and the water column breaks (cavitates).
2007-10-24 02:06:12 · answer #4 · answered by DanE 7 · 1⤊ 0⤋
well because of pressure of the air pushing down or something like that, the water in the straw has to be less of a weight than the pressure of air
???
don't quote me on it though
2007-10-24 02:03:32 · answer #5 · answered by Anonymous · 1⤊ 1⤋
lol im not sure but try watching "Brainiac". It is educational and hilarious at the same time. like when they got a flight recorder box that can withstand over 1000 degrees Celcius heat and can withstand over 2000 G's and they tryed to destroy it with a car crusher. They also destroyed a safe with some tanks.
2007-10-24 02:03:45 · answer #6 · answered by The Grim Reaper 1 · 2⤊ 2⤋
9.7536 m for water
2007-10-24 03:13:16 · answer #7 · answered by Pearlsawme 7 · 0⤊ 0⤋