本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯
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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。4 f- `' B- Z; S
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) t* ]/ L6 ~/ G) }Magdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering!
) b9 W& m9 p( ?+ S1 Z+ k& ?# x) fThis is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project. ( H7 v" L; d. v8 t& z R6 t
It is located in the city of Magdeburg, near Berlin.公仔箱論壇9 A# {, Y: W, u* C# ^: v2 k
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The photo was taken on the day of inauguration.5.39.217.76, M! h" ?. l! q' Q
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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2 `5 ~' W# i6 l( w& j5.39.217.76Did that bridge have to be designed to withstand the additional weight of ship and barge traffic,
( L0 J2 F+ E( x: N% L5.39.217.76Or just the weight of the water?
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( U( @0 W- T! e, S) N1 Y公仔箱論壇Answer:
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It only needs to be designed to withstand the weight of the water! 0 l& n u* b' _* o4 C- 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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tvb now,tvbnow,bttvb. e/ e, X7 S0 `8 i
The Incredible Magdeburg Water Bridge in Germany
7 `. C1 t( a) G$ d4 n9 kThe 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.
: P! O( Z/ e$ L& Y1 H5.39.217.76The 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. tvb now,tvbnow,bttvb' z+ y- L; Q X3 t
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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. 公仔箱論壇0 a! Q) a. O$ U. Y2 w9 {/ o2 g
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