本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯 tvb now,tvbnow,bttvb- b1 X& u* r* d/ S2 W! ]# [/ v+ E
% X1 u3 E, Q, d( T; |公仔箱論壇If you are not a Physics person, read on and learn a fact of physics.
8 z4 b" `* q4 `! |1 v4 ?9 jTVBNOW 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。AMAZING! 5.39.217.77:88982 n$ `" Y0 I4 x/ s' U' K1 u1 }
, ^1 D# r8 |8 `' UEven after you see it, it is still hard to believe!公仔箱論壇9 v% j0 y) t; H% C
8 V1 U. W- x- w+ A9 V2 U c5 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。9 r4 Y- C# m) w" q0 a7 @1 H) j
Magdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering! 公仔箱論壇2 N8 [6 y+ P' m0 \0 J
This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project. " y( l* y/ j+ L+ a* M
It is located in the city of Magdeburg, near Berlin.5.39.217.77:8898' N6 X; E: ~$ ~6 q- E+ s. r7 u
) R6 V4 x1 B1 G" s8 H' N- E% |公仔箱論壇The photo was taken on the day of inauguration.7 ~5 o/ e5 G. X
To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.
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Question:5.39.217.77:8898/ y# Y: n# O6 B3 E) m
& J4 y: L; D/ e0 g8 r, [' Y# B公仔箱論壇Did that bridge have to be designed to withstand the additional weight of ship and barge traffic,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。) U% I5 t1 \! H1 _0 f
Or just the weight of the water? v2 p7 }3 p0 R' M) G9 q
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Answer:
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; _4 L) P$ u* FIt only needs to be designed to withstand the weight of the water!
4 J6 X0 V6 ~- @8 x& f. g$ O公仔箱論壇Why? A ship always displaces an amount of water that weighs the same as the ship, regardless of how heavily a ship may be loadedTVBNOW 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。; w1 _& a- @: F( i
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The Incredible Magdeburg Water Bridge in Germany
3 d( f7 r& l' o" ?6 J2 R& L公仔箱論壇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.公仔箱論壇6 u/ F' ?& X+ C9 ~
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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& H. w2 ]3 T" Q# m; }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。3 q3 ^ E1 ^. w+ ?
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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。$ H0 b( x+ e( O6 S) I
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