Using this difference, one can estimate how far away the bolt of lightning is by timing the interval between seeing the flash and hearing thunder. The speed of sound in dry air is approximately 343 m/s or 1,127 ft/s or 768 mph (1,236 km/h) at 20 Â°C (68 Â°F).
From Wikipedia, the free encyclopedia. Fort Pierce is a city in and the county seat of St. Lucie County, Florida, United States. It is also known as the Sunrise City, sister to San Francisco, California, the Sunset City. The population was 41,590 at the 2010 census. As of 2012, the population recorded by the U.S. Census Bureau was 42,645.
Fort Lewis began as Camp Lewis in 1917 when the citizens of Pierce County voted by an eight to one margin to bond themselves for $2 million to buy 68,721 acres (278 kmÂ²) of land. They donated the land to the federal government for military use. The only stipulation was that the tract be used as a permanent army post.