本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯 3 m* [7 b# V; F% ~; ~. m# b
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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!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。 _. Z2 A* z0 P7 v; q
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- D- o* `; p! a* Z) r: r9 eMagdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering! . s2 V7 a% Y, W, d
This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project. 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。# R% u. X; @- M5 {/ D. {% y( j
It is located in the city of Magdeburg, near Berlin.
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The photo was taken on the day of inauguration.www2.tvboxnow.com3 j0 b) W: ~* x) S
To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.
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Question:
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' c8 t: M, K: SDid that bridge have to be designed to withstand the additional weight of ship and barge traffic,5 [7 V# h N Y" t( @4 H2 k
Or just the weight of the water?
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1 L% _% h/ _/ L0 d, rwww2.tvboxnow.comAnswer:
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It only needs to be designed to withstand the weight of the water! 公仔箱論壇4 V5 m0 z7 n% t% A) o7 Q0 ?1 t
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
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1 `/ `* L' S& `. h2 H0 ]! c& U5 Mwww2.tvboxnow.comThe Incredible Magdeburg Water Bridge in Germanywww2.tvboxnow.com1 v! G; p# V9 v% g, v( m) i
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./ @- H$ M1 A* Y5 o' I1 S3 b G
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.
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9 g) f2 V! q/ U$ \$ J3 itvb now,tvbnow,bttvbConstruction 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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