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Pennsylvania Turnpike Pennsylvania Turnpike mainline highlighted in green Route information Maintained by PTC Length 360.09 mi (579.51 km) Existed October 1, 1940 –present History Completed on May 23, 1956 Component highways I-76 from the Ohio state line to Valley Forge I-70 from New Stanton to Breezewood I-276 from Valley Forge to Bristol Township I-95 from Bristol Township to the New ...
Pennsylvania is one of 13 original colonies that share a border with Canada. Pennsylvania is 180 miles (290 km) north to south and 310 miles (500 km) east to west. The total land area is 44,817 square miles (116,080 km 2 )—739,200 acres (2,991 km 2) of which are bodies of water. It is the 33rd largest state in the United States.
Comoving distance and proper distance. Comoving distance is the distance between two points measured along a path defined at the present cosmological time. For objects moving with the Hubble flow, it is deemed to remain constant in time. The comoving distance from an observer to a distant object (e.g. galaxy) can be computed by the following ...
In astronautics, the Hohmann transfer orbit ( / ˈhoʊmən /) is an orbital maneuver used to transfer a spacecraft between two orbits of different altitudes around a central body. For example, a Hohmann transfer could be used to raise a satellite's orbit from low Earth orbit to geostationary orbit. In the idealized case, the initial and target ...
Braking distance refers to the distance a vehicle will travel from the point when its brakes are fully applied to when it comes to a complete stop. It is primarily affected by the original speed of the vehicle and the coefficient of friction between the tires and the road surface, [Note 1] and negligibly by the tires' rolling resistance and vehicle's air drag.
Naismith 's rule [ 1][ 2] Naismith's rule helps with the planning of a walking or hiking expedition by calculating how long it will take to travel the intended route, including any extra time taken when walking uphill. This rule of thumb was devised by William W. Naismith, a Scottish mountaineer, in 1892. [ 1][ 3][ 4] A modern version can be ...
Flight length. In aviation, the flight length or flight distance refers to the distance of a flight. Aircraft do not necessarily follow the great-circle distance, but may opt for a longer route due to weather, traffic, to utilise a jet stream, or to refuel. Commercial flights are often categorized into long-, medium- or short-haul by commercial ...
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