本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯 公仔箱論壇8 Q2 D3 N3 z1 O* \! t
( P6 i+ D7 E# W7 V1 x; RIf you are not a Physics person, read on and learn a fact of physics. 5.39.217.76- o; ]+ G0 ]2 {6 ~
AMAZING!
$ j( y9 k+ ~2 Z. Y3 B! P. E& BTVBNOW 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。
6 d9 ]- o; s$ r* X$ B: Qtvb now,tvbnow,bttvbEven after you see it, it is still hard to believe!) G1 F4 D3 t1 s! n- d. p
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Magdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering! 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。9 a7 m( @: f8 q" G) t6 [- u/ `% \
This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project. 公仔箱論壇9 f$ |! b& N; `
It is located in the city of Magdeburg, near Berlin.tvb now,tvbnow,bttvb9 A/ k1 e* K' X
! _, X% P) F# P9 m' u2 GThe photo was taken on the day of inauguration.
- u7 a, ~3 ]% S+ ^ W L- t2 J4 O3 ^ Ttvb now,tvbnow,bttvbTo those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.5.39.217.766 a7 }" B7 w& I( p W% i+ X( \
% e( m: u5 E+ X! o9 M2 g3 E; u Mtvb now,tvbnow,bttvbQuestion:公仔箱論壇/ q0 C( B0 U/ i, W8 F8 p* N
% A8 c0 p# `- v- kDid that bridge have to be designed to withstand the additional weight of ship and barge traffic,
* ?' ^. R7 r0 X, W* c' E5.39.217.76Or just the weight of the water?
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+ N8 ~1 b+ h$ N( z3 N+ n, Ctvb now,tvbnow,bttvbAnswer:
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It only needs to be designed to withstand the weight of the water! 4 q. }$ L" r0 m$ [9 l+ F( 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 loadedtvb now,tvbnow,bttvb- e! [( a+ Y% ~( Y* r4 P0 @
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+ h, Y0 o9 b e: `" H& f+ [The Incredible Magdeburg Water Bridge in Germany/ U, _* h- v7 [1 s
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.tvb now,tvbnow,bttvb' u0 |# H2 V% D. J
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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