Page 8 - Curriculum Visions Dynamic Book. To close the book, close the tab.
P. 8

  Buoyancy
  Buoyancy—Ships settle deeper in the water as they are filled with cargo,
but the upthrust of the water on the underside of the ship keeps them afloat.
                               Upthrust
Cargo
Upthrust
  Buoyancy
The property of floating, first explained by the Ancient Greek mathematician Archimedes. Anything that is completely or partially submerged in water
is supported by an upward, or buoyant, force called upthrust. The size of this force equals the weight of the water that is moved aside by the floating body. Thus a boat placed in a river will settle
until the weight of the river water it pushes aside is equal to its own weight. If more weight is placed in the boat and it becomes heavier, it will settle lower.
   C
Canal
An artificial waterway designed to be used for transportation.
The major canals of the world include: Suez Canal (opened 1869) 170km long, 150m wide, and
13m deep; Panama Canal (opened 1914) 85km long, 81m wide, and 11m deep; St. Lawrence Seaway 3,800km (includes Welland Canal 45km); Keil Canal (opened 1914) 100km long; Rhine Danube Canal (completion 1996); Corinth Canal (opened 1893) 6km gorge over 80m deep.
The first ancient large canal system was built by the Chinese
in the 3rd century b.c. By the 7th century a.d. the system had become the Grand Canal that connected
 Canal—Canals were important in helping industrialization in both North America and Europe. Many now lie disused because industries no longer depend on water in the way they once did.
the Yangtze River to Beijing, a distance of about 1,600km. It remains the longest artificial waterway in the world.
The Romans built many canals in Europe. But the main development of European and American canals was in the 18th
8
  













































































   6   7   8   9   10