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A set of equations describing the trajectories of objects subject to a constant gravitational force under normal Earth-bound conditions.Assuming constant acceleration g due to Earth's gravity, Newton's law of universal gravitation simplifies to F = mg, where F is the force exerted on a mass m by the Earth's gravitational field of strength g.
That is, 7.92 units of distance are equivalent to 1 unit of climb. For convenience an 8 to 1 rule can be used. So, for example, if a route is 20 kilometres (12 mi) with 1600 metres of climb (as is the case on leg 1 of the Bob Graham Round , Keswick to Threlkeld), the equivalent flat distance of this route is 20+(1.6×8)=32.8 kilometres (20.4 mi).
At the time, Smoot was 5 feet, 7 inches, or 170 cm, tall. [18] Google Earth and Google Calculator include the smoot as a unit of measurement. The Cambridge (Massachusetts) police department adopted the convention of using Smoots to measure the locations of accidents and incidents on the bridge.
Starting in 2011, Google Earth enabled the ability to measure distance using smoots, with the standard length of 5 feet 7 inches. [20] The calculator function of Google Search also provides values in smoots, [ 21 ] and in 2011, smoot was one of the 10,000 new words added to the fifth edition of The American Heritage Dictionary .
A typical skydiver in a spread-eagle position will reach terminal velocity after about 12 seconds, during which time they will have fallen around 450 m (1,500 ft). [4] Free fall was demonstrated on the Moon by astronaut David Scott on August 2, 1971. He simultaneously released a hammer and a feather from the same height above the Moon's surface.
The basic unit of length in the imperial and U.S. customary systems is the yard, defined as exactly 0.9144 m by international treaty in 1959. [2] [10] Common imperial units and U.S. customary units of length include: [11] thou or mil (1 ⁄ 1000 of an inch) inch (25.4 mm) foot (12 inches, 0.3048 m) yard (3 feet, 0.9144 m)
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There are many standalone applications that offer the thousands of the various units with conversions. For example, the free software movement offers a command line utility GNU units for GNU and Windows. [7] The Unified Code for Units of Measure is also a popular option.