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In addition, 511.org provides information on bicycling, ridesharing, and the toll road system FasTrak. 511.org [17] is a service of the Metropolitan Transportation Commission, [18] and was designed by the transportation engineering company PB Farradyne, [19] a division of Parsons Brinckerhoff Quade & Douglas, [18] (later Telvent Farradyne). [20]
The mass of the e- and e+ is completely converted into two photons with an energy of 511 keV each. These annihilation photons are emitted in opposite directions, 180˚ apart. This is the basis for PET scanners in a process called coincidence counting.
In particle physics, the electron mass (symbol: m e) is the mass of a stationary electron, also known as the invariant mass of the electron. It is one of the fundamental constants of physics . It has a value of about 9.109 × 10 −31 kilograms or about 5.486 × 10 −4 daltons , which has an energy-equivalent of about 8.187 × 10 −14 joules ...
In the early 2010s, the Massachusetts Department of Transportation (MassDOT) proposed a $137-million (equivalent to $187 million in 2023 [12]) project to widen the existing 2.4-mile (3.9 km) four-lane highway section to six lanes, from north of Route 99 in Saugus to south of Route 60 in Revere. The proposal consisted of adding a 12-foot (3.7 m ...
The longest Interstate highway in Massachusetts is Interstate 90 (the Mass Pike), which runs 138.1 miles (222.3 km). The shortest route in Massachusetts is Route 15, which runs for only 0.23 miles (0.37 km). The shortest signed highway is Route 108, which runs for 0.92 miles (1.48 km). Both are short extensions of state highways in neighboring ...
Highway Division of the Massachusetts Department of Transportation; Office of Transportation Planning. "Data Resources Section". Massachusetts Department of Transportation. Archived from the original on June 1, 2012. (Includes a road inventory and maps.) Neilbert.com Massachusetts Route Log; The Roads of Massachusetts; Road Signs of Massachusetts
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Mass: 590,000 kg (1,300,000 lb) Stages: 2: ... First and only planned flight of the 511 configuration 92 1 March 2022 21:38 541 AV-095 Cape Canaveral, SLC-41 GOES-T: