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Korean scientists think they have determined what caused a 39-story Seoul skyscraper to shake violently for 10 minutes, causing the building to be evacuated for two days. Earthquake? Nope. Gale-force winds? Sorry. Volcanic activity? Unh-uh.
No, the culprit, they say, was 17-middle-aged gym rats working off the midriff bulge in a Tae Bo class. Apparently, while dancing and boxing to "The Power" by Snap on July 5, the exercisers not only shook their booties, they shook the building. "It just happens to be that the vibration set up by the Tae Bo exercises coincided with the resonance frequency unique to the building," Chung Lan, professor of Architectural Engineering at Dankook University, told the Korea Times. "When an external vibration hits the resonance frequency of a certain object, the vibration is amplified and causes excess shaking even from slight movement." Six Architectural Institute of Korea professors and several vibration measurement experts inspected the building, a high-rise shopping mall, and carried out a simulation of the exercise class using the same number of participants. They agreed that mechanical resonance was the probable explanation. Chung said the class had a new instructor who apparently worked the group twice as hard as usual.
Originally posted by luckythirteen
They couldn't move the bridge to destruction, but they did show a video taken around 1940 where traffic matched the resonant frequency perfectly and violently shook it to destruction. It was incredible how much it was twisting, waving and swinging side to side, literally flipping cars into the air.
Fan death is a widely held belief prevailing in South Korea that an electric fan left running overnight in a closed room can cause the death of those inside. Fans sold in Korea are equipped with a timer switch that turns them off after a set number of minutes, which users are frequently urged to set when going to sleep with a fan on.
Originally posted by qonone
reply to post by 1FullHouse
I agree, since that show the Mythbusters lost me as a frequent viewer. Even though they could feel a vibration more or less equivalent to that of a truck, they just wrote Tesla's machine off in a way. It may be for security reasons so that not any TDH will try to build one or myself being a South African didn't catch their sarcasm, I prefer the former.
This proves, as Tesla's experiment in his building, it is the real thing.
* Savedone is correct on how that bridge came down.edit on 7/26/2011 by qonone because: added