本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯 www3.tvboxnow.com0 Q: ^' y) z( m" e( ~' i2 N+ l
' Y+ F! v8 k, t( ~# }! HIf you are not a Physics person, read on and learn a fact of physics. 公仔箱論壇/ I" }: C8 k9 Z
AMAZING!
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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!
) z# s1 e2 j; NThis is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project.
/ t& I2 n. k7 p; X! Vtvb now,tvbnow,bttvbIt is located in the city of Magdeburg, near Berlin.公仔箱論壇5 X6 w9 c( f6 B' L: G3 z1 o& ]
0 K8 e: p- {' A% p! }The photo was taken on the day of inauguration.
9 W4 u+ O/ d" m8 Z6 S5 q, x. ATo those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.
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2 h: L& `* Y+ H% a y: kQuestion:
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. W) q: F7 n3 B8 C' uDid that bridge have to be designed to withstand the additional weight of ship and barge traffic,
$ U Q, P" s. u) ^) V9 \ e- X, B公仔箱論壇Or just the weight of the water? tvb now,tvbnow,bttvb8 l, B" w8 I; \1 @0 M7 s1 ~
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Answer:
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It only needs to be designed to withstand the weight of the water!
& Z4 ?0 X& @% m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 loaded
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The Incredible Magdeburg Water Bridge in Germany
/ F9 D' ` W7 W8 Q$ x* p+ n7 p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.www3.tvboxnow.com! E6 L* M8 `4 ^, a7 H0 [
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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9 v( G: ]! g9 {2 n8 `1 W7 k: [: {- s公仔箱論壇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. ! \, S9 w4 ~+ H$ C
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