本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯 ; s9 u8 i+ F9 x. ~
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If you are not a Physics person, read on and learn a fact of physics.
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% ~; _0 X9 Y; ~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。Even after you see it, it is still hard to believe!
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Magdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering!
+ p+ d. Q2 z o' r4 _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。This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project.
& n" v! o C* U0 WIt is located in the city of Magdeburg, near Berlin.
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The photo was taken on the day of inauguration.
4 p" Z4 h! L! Q& L) uTVBNOW 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。To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.
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8 z1 o8 K5 d; [tvb now,tvbnow,bttvbQuestion:
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" O! |0 W$ D3 v. {) Itvb now,tvbnow,bttvbDid that bridge have to be designed to withstand the additional weight of ship and barge traffic,
& b1 s. F) Y! ? p( S+ ^Or just the weight of the water? 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。! a$ h9 ~3 o+ W* ]
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Answer:
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It only needs to be designed to withstand the weight of the water! ( Z- _+ i/ m2 J6 |4 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
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! t8 s. i; x- \+ ]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。
; f3 c9 y1 m9 ]8 Otvb now,tvbnow,bttvbThe Incredible Magdeburg Water Bridge in Germany公仔箱論壇! c6 H( S/ h3 {! d( Z
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- Q' w# b* @9 x% }+ i; o8 t
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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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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! U- S# m6 l5 T- o' U5.39.217.76TVBNOW 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。( J4 d6 i4 q: p6 T) C
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! r6 p1 l& U4 R5.39.217.76TVBNOW 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。2 m/ k$ _! y. k9 E5 U5 g: l
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