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.
Pierce County is a county located in the U.S. state of Nebraska. As of the 2010 census, the population was 7,266. Its county seat is Pierce. The county was formed in 1859 and named after President Franklin Pierce. Pierce County is part of the Norfolk, NE Micropolitan Statistical Area. In the Nebraska license plate system, Pierce County is represented by the prefix 40 (it had the 40th-largest number of vehicles registered in the county when the license plate system was established in 1922).