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| Interactive [Message Board] |
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| Author |
Subject: Àíòèðåêëàìà |
Azamat
Registered User
Post: 286
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Posted 04-11-03 - 04:28 AM
Ìîæåò êòî âèäåë ðåêëàìó "Fanta" ãäå íà áàëêîíå ïàðíè, çàâèäåâ íà ñòîëèêå âíèçó îòêðûòóþ áóòûëêó, áûñòðî ñîîðóæàþò äëèííóþ òðóáî÷êó è íà÷èíàþò âûñàñûâàòü ñîäåðæèìîå. Îíè óæå ïî÷òè áûëî âûïèëè âñå êàê â ïîñëåäíèé ìîìåíò .. íó à äàëüøå íåâàæíî.
Âîò ýòî è åñòü òèïè÷íàÿ ðåêëàìà, êîòîðàÿ ïîäñîçíàòåëüíî íåñåò â ñåáå îøèáî÷íûå äàííûå.
Âî-ïåðâûõ îíè ñòîÿëè íà áàëêîíå - âûñîòà íå ìåíåå 3-õ ìåòðîâ. Òðóáî÷êà òîíêàÿ - â äèàìåòðå íå áîëåå 3-4 ìèëëèìåòðîâ.
×òîáû ïîäíÿòü æèäêîñòü íà òàêóþ âûñîòó äà ÷åðåç òàêóþ òîíêóþ òðóáêó íóæíî ïðåîäîëåòü äâà ôàêòîðà:
1) Çåìíîå òÿãîòåíèå
2) Êîýôôèöèåíò ïîâåðõíîñòíîãî íàòÿæåíèÿ æèäêîñòè â òðóáêå.
Èòîã: Îíè íå ñìîãëè áû íèêàê ïîäíÿòü óðîâåíü æèäêîñòè íà âûñîòó 3 ìåòðà. Ó íèõ íå õâàòèò äëÿ ýòîãî äàâëåíèÿ.
Äàáû íå ïðîñëûòü ãîëîñëîâíûì - çàâòðà ïðèâåäó ðàñ÷åòû è ôîðìóëû. |
| 1st Reply |
Lena
Banned: 2 time(s)
Banned
Post: 572
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Posted 04-11-03 - 08:56 AM
:) |
| 2nd Reply |
Arven
Registered User
Post: 142
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Posted 04-11-03 - 09:25 PM
Àçàìàò, ÿ âåðþ è áåç ôîðìóë! :) |
| 3rd Reply |
Azamat
Registered User
Post: 289
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Posted 05-11-03 - 03:33 AM // Updated 05-11-03 - 03:41 AM
Arven, ñïàñèáî çà äîâåðèå :)
Íî ðàç ÿ â÷åðà îáåùàë, òî âîò è äîêàçàòåëüñòâà.
Äàíî:
h=4 ì (äëèíà òðóáêè) (3 ìåòðà ìàëîâàòî äëÿ âòîðîãî ýòàæà)
r=2*10 ì (ðàäèóñ òðóáêè) (äèàìåòð 4 ìì)
g=9,8 ì/ñ (óñêîðåíèå ñâîáîäíîãî ïàäåíèÿ)
Po=101300 Ïà (íîðìàëüíîå àòìîñôåðíîå äàâëåíèå = 1 àòìîñôåðå)
Ï=3,144142 - íó êòî å¸ íå çíàåò
ρ=1000 êã/ì (ïëîòíîñòü âîäû - áóäåì ñ÷èòàòü, ÷òî ïëîòíîñòü Fantà íå ñèëüíî îòëè÷àåòñÿ)
Òàê êàê ïîä âîçäåéñòâèåì Ëàïëàñîâñêîãî äàâëåíèÿ æèäêîñòü ïîäíèìåòñÿ âñåãî íà 7 ìì, à âåëè÷èíà äàâëåíèÿ ñîñòàâèò 68 Ïà, òî ýòó âåëè÷èíó ìîæíî â ðàñ÷åòàõ îïóñòèòü.
Äîïóñòèì, ÷òî ïàðåíü ñîçäàë ðòîì äàâëåíèå, è æèäêîñòü çàïîëíèëà ñîáîé âñþ òðóáêó. Ýòî çíà÷èò, ÷òî ìàññà æèäêîñòè â ýòîé òðóáêå ñîñòàâëÿåò ïðîèçâåäåíèå ïëîòíîñòè íà îáúåì.
m= ρ*V, ãäå V=Ï*r²*h=5,0265e-3 ì
m=5,0265e-2 êã = 50,265 ãðàìì.
Èç óðàâíåíèÿ P=F/S ÿ íàéäó äàâëåíèå ñòîëáà æèäêîñòè.
F=m*g; F=4,9260e-1 Í; S=Ï*r²=1,2563e-5 ì²
P=F/S = 38992,96 Ïà.
À òàê êàê âñå ýòî ïðîèñõîäèò ïðè àòìîñôåðíîì äàâëåíèè, òî ïðèïëþñóþ ñþäà åù¸ îäíó àòìîñôåðó.
Èòîãî P=140292,96 Ïà. Èëè P=1,38Po.
×òîáû ïîäíÿòü æèäêîñòü íà òàêóþ âûñîòó, íóæíî ñîçäàòü äàâëåíèå, ïðåâûøàþùåå àòìîñôåðíîå äàâëåíèå â 1,4 ðàçà.
Åñëè åùå êîãî-íèáóäü ãëîæóò ñîìíåíèÿ, òî ïðåäñòàâüòå ñåáå, ÷òî íóæíî íàêà÷àòü âåëîñèïåäíóþ êàìåðó ðòîì. À äàâëåíèå â êàìåðå äîëæíî ñîñòàâëÿòü 1,5-2,5 Àòì. Âîò, âîò – íåðàçðåøèìàÿ çàäà÷à. Òåïåðü âñå ñòàëî ÿñíî.
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| 4th Reply |
Azamat
Registered User
Post: 299
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Posted 06-11-03 - 04:06 AM
Äà, âèäàòü ñèëüíî ÿ âàñ çàãðóçèë :)
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