seconds pendulum वाक्य
उदाहरण वाक्य
मोबाइल
- He derives the formula for the length of a mathematical seconds pendulum at any place on the Earth, compares it with that of de Prony's formula for the length of physical seconds pendulum.
- He derives the formula for the length of a mathematical seconds pendulum at any place on the Earth, compares it with that of de Prony's formula for the length of physical seconds pendulum.
- From 1824, the basic unit was defined as a " fot " being derived from astronomy as the length of a one-second pendulum times 12 / 38 at a latitude of 45?
- While on passage to join his ship, he struck up a close friendship with Captain Edward Sabine, who was travelling to Africa to commence a series of observations on the length of the seconds pendulum.
- Combining these instruments he tried to determine a standard of length by use of a seconds pendulum ( initially a Foucault pendulum, later he ordered a Repsold reversible pendulum which arrived shortly after his death ).
- In 1790, then US Secretary of State Thomas Jefferson proposed to Congress a comprehensive decimalized US'metric system'based on the seconds pendulum at 38?North latitude, the mean latitude of the United States.
- If I remember right, a foot was to be one fifth of the swing width of a seconds pendulum ( one fifth in order to make the metric foot close in length to the traditional foot ).
- By the end of the 18th century, when many nations were reforming their weight and measure systems, the seconds pendulum was the leading choice for a new definition of length, advocated by prominent scientists in several major nations.
- By measuring the length of a seconds pendulum in different latitudes, one can calculate the " oblateness " of the Earth-i . e . the degree to which the " figure of the Earth " departs from perfect sphericity.
- However, it was soon discovered that the length of a seconds pendulum varies from place to place : French astronomer Jean Richer had measured the 0.3 % difference in length between Cayenne ( in French Guiana ) and Paris.
- Gravitational acceleration increases smoothly from the equator to the oblate shape of the Earth, so at any given latitude ( east-west line ), gravity was constant enough that the length of a seconds pendulum was the same within the measurement capability of the 18th century.
- While France ultimately based their metre on the Earth's circumference-- something common folk could never hope to measure with the required accuracy-- Jefferson's system used the seconds pendulum to define the metre ( he called it a yard, I think ).
- Although not defined by the pendulum, the final length chosen for the metre, 10 " 7 of the pole-to-equator meridian arc, was very close to the length of the seconds pendulum ( 0.9937 m ), within 0.63 %.
- Starting on the assumption that the length of a second pendulum in the latitude of London was 39.2 inches, he deduced that the length of one oscillating forty-two times a minute is eighty inches, while that of one oscillating twice as many times is twenty inches.
- There was also something about Jefferson being annoyed that the French had chosen to base the metre on the size of the Earth, which was not even known precisely at the time, rather than the distance a seconds pendulum swang, which anyone who cared to could confirm for themselves.
- Virtually all proposals were based on the seconds pendulum, in which each swing ( a half period ) takes one second, which is about a meter ( 39 inches ) long, because by the late 17th century it had become a standard for measuring gravity ( see previous section ).
- Two branches of Sabine's work are notable : Determination of the length of the seconds pendulum, a simple pendulum whose time period on the surface of the Earth is two seconds, that is, one second in each direction; and his research on the Earth's magnetic field.
- In 1816 he was secretary of a commission charged with ascertaining the precise length of the second's or seconds pendulum ( the length of a pendulum whose period is exactly 2 seconds ), and in 1818 he became secretary to the Board of Longitude and superintendent of the HM Nautical Almanac Office.
- Talleyrand resurrected the idea of the seconds pendulum before the Constituent Assembly in 1790, suggesting that the new measure be defined at 45�N ( a latitude that, in France, runs just north of Bordeaux and just south of Grenoble ) : despite the support of the Assembly, and of Great Britain and the newly independent United States, nothing came of Talleyrand's proposal.
- Pendulums were so universally used to measure gravity that, in Kater's time, the local strength of gravity was usually expressed not by the value of the acceleration " g " now used, but by the length at that location of the " seconds pendulum ", a pendulum with a period of two seconds, so each swing takes one second.
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