“The same wind that used to pump water for cattle is now turning giant wind turbines to power cities and homes.”
“The blades only turn about 18 RPM, not nearly fast enough to create electricity, so the rotor shaft spins a series of gears that increase the rotation up to 1800 RPM 맥 os x 매버릭스. At that speed the generator can produce a lot of electricity.”
One World Trade Center hit a milestone at the end of January when it passed the 90th floor and became the most expensive building in the world 다운로드.
Now, with construction passing the 93rd floor, it’ll soon hit another milestone: in the next few weeks, it will pass the Empire State Building to become the tallest building in NYC 아마존 비디오 다운로드.
Eventually, the 104-story tower will be taller than 1776 feet (including spire and antennae). “It’s a statement of fortitude and determination and the absolute best of mankind.” The tower’s three-level observation deck on the 100th, 101st and 102nd floor—around 1,269 feet up—is projected to be open to the public by early 2014 다운로드.