本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯 tvb now,tvbnow,bttvb9 P; ~! P5 l6 G6 p
( ^( f) k# l4 d公仔箱論壇If you are not a Physics person, read on and learn a fact of physics.
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Even after you see it, it is still hard to believe!" z. d+ b& B. ~0 U/ v
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4 ^4 g# L" B+ W) {/ R0 ftvb now,tvbnow,bttvbMagdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering! 5.39.217.76% l( @% g: m D
This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project.
! {) ~) d6 z" P公仔箱論壇It is located in the city of Magdeburg, near Berlin.
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The photo was taken on the day of inauguration.5.39.217.76: [4 e9 ]0 m$ l* E
To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.5.39.217.76+ B/ C3 ]4 B) K1 L8 Q+ f" e% _
0 [+ q/ p# X, b1 S, |* |Question:5.39.217.76, C" ?* L& p* }" s& h' T; g' F
/ N& h- c3 U* c. d/ c+ d' PTVBNOW 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。Did that bridge have to be designed to withstand the additional weight of ship and barge traffic,
% d* a _8 K3 I' s9 l公仔箱論壇Or just the weight of the water?
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Answer:
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It only needs to be designed to withstand the weight of the water!
1 ?" _) j: K e4 l* ^+ ]5.39.217.76Why? A ship always displaces an amount of water that weighs the same as the ship, regardless of how heavily a ship may be loadedtvb now,tvbnow,bttvb- _. e) m$ ?* X) f7 x
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The Incredible Magdeburg Water Bridge in Germany
) f8 c. [' N6 SThe 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.5.39.217.76. ?; o9 `* i4 P3 Y
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. ' n+ W/ d2 u' L6 `& U/ g* A5 V
7 Z8 v2 ^. Q& k8 D0 x* D2 IConstruction 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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