本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯 tvb now,tvbnow,bttvb5 G( `% T2 s+ C7 q
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If you are not a Physics person, read on and learn a fact of physics.
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& ?$ O, p5 \) N8 I6 n$ @7 M- CTVBNOW 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! os.tvboxnow.com! G" I& j& v2 l) x6 P9 J: o' z
This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project.
' H O" L; C0 h' _, ros.tvboxnow.comIt is located in the city of Magdeburg, near Berlin.
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The photo was taken on the day of inauguration.
/ o! E' |* K0 f9 u5 A. pTo those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.
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2 J O4 K, r% f7 | uQuestion:
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& f+ y- w, S$ J7 Pos.tvboxnow.comDid that bridge have to be designed to withstand the additional weight of ship and barge traffic,
- X! w! M; S0 ]& f6 r# |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。Or just the weight of the water?
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" ]9 o2 n1 |) _: l公仔箱論壇Answer:
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It only needs to be designed to withstand the weight of the water! , g1 c/ r9 s" s
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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3 c1 @4 v2 C) {, I+ E; etvb now,tvbnow,bttvbThe Incredible Magdeburg Water Bridge in GermanyTVBNOW 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。$ O. N& g% x K3 @# C
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.
# V5 ^/ ~- C1 |+ l# w: O2 lThe 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. os.tvboxnow.com3 Y9 N* z0 H4 N# L4 z" r
6 o( a7 g, G0 Y: Zos.tvboxnow.comConstruction 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. 7 A4 y, ]5 y$ X# z2 n4 Q$ a
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