本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯 tvb now,tvbnow,bttvb. K1 t8 }# n& U+ a: y5 A
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If you are not a Physics person, read on and learn a fact of physics. 5.39.217.76- p. h+ i, U8 g0 ?+ {6 P4 p
AMAZING!
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7 |" B* O O% k: G5.39.217.76Even after you see it, it is still hard to believe!7 {" X# h2 w$ U& V+ b
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5 {3 E/ H3 K# p2 Z+ x5.39.217.76Magdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering! 2 J7 W9 q D0 ]& c' x% ^
This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project.
- a# P5 `5 o2 Z( z5 N+ c3 ^' @" _公仔箱論壇It is located in the city of Magdeburg, near Berlin.1 w$ k" n; m' c* i! u
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The photo was taken on the day of inauguration.
: B" c H5 h t% Wtvb now,tvbnow,bttvbTo those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。' W& y' Q, I0 ]( D0 ^: H# I5 c
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Question:
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Did that bridge have to be designed to withstand the additional weight of ship and barge traffic,1 _1 b& y# [' r$ G2 O4 i1 U* ]
Or just the weight of the water? tvb now,tvbnow,bttvb: e0 v: ~7 G+ U
7 B6 \. E0 j6 X" NAnswer:4 H0 w; \: |2 A2 Z7 n
]; U& Y x$ t1 U& l( wIt only needs to be designed to withstand the weight of the water! " A6 e0 I. o2 h" B1 B
Why? A ship always displaces an amount of water that weighs the same as the ship, regardless of how heavily a ship may be loaded$ i: o! T% Q& G/ Y0 B6 p
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The Incredible Magdeburg Water Bridge in Germany
2 ^, k3 o% f( c$ N) `The Magdeburg Water Bridge is a navigable aqueduct in Germany that connects the Elbe-Havel Canal to the Mittelland Canal and allows ships to cross over the Elbe River. At 918 meters, it is the longest navigable aqueduct in the world., @" L" U1 J# }- }. i" r( ^( S
The Elbe-Havel and Mittelland canals had previously met near Magdeburg but on opposite sides of the Elbe Ships moving between the two had to make a 12-kilometer detour, descending from the Mittelland Canal through the Rothensee boat lift into the Elbe, then sailing downstream on the river, before entering the Elbe-Havel Canal through Niegripp lock. Low water levels in the Elbe often prevented fully laden canal barges from making this crossing, requiring time-consuming off-loading of cargo. 5.39.217.767 l2 T8 t$ p8 n/ a2 D7 q/ y
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Construction of the water link was started as early as in the 1930s but due to the World War 2 and subsequent division of Germany the work remained suspended till 1997. The aqueduct was finally completed and opened to the public in 2003.
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