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Some common events in seconds are: a stone falls about 4.9 meters from rest in one second; a pendulum of length about one meter has a swing of one second, so pendulum clocks have pendulums about a meter long; the fastest human sprinters run 10 meters in a second; an ocean wave in deep water travels about 23 meters in one second; sound travels about 343 meters in one second in air; light takes a fraction over one second to reach Earth from the surface of the Moon.A second is part of other units, such as frequency measured in hertz (inverse seconds or second).Of the 22 named derived units of the SI, only three: degree Celsius, radian, and steradian, do not depend on the second.Many derivative units for everyday things are reported in terms of larger units of time, not seconds, such as clock time in hours and minutes, velocity of a car in miles/hour or kilometers/hour, kilowatt hours of electricity usage, and speed of a turntable in rotations per minute.For the metric unit of second, there are decimal prefixes representing 10 seconds.

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The international standard for timekeeping is Coordinated Universal Time (UTC).Mechanical and electric clocks and watches usually have a face with 60 tickmarks representing seconds and minutes, traversed by a second hand and minute hand.Digital clocks and watches often have a two-digit counter that cycles through seconds.Small divisions of time could not be counted back then, so such divisions were figurative.The first timekeepers that could count seconds accurately were pendulum clocks invented in the 17th century.That means that every second, minute and every other division of time counted by the clock will be the same duration as any other identical division of time.But a sundial which measures the relative position of the sun in the sky called apparent time, does not keep uniform time.Multiples of seconds are usually counted in hours and minutes.Fractions of a second are usually counted in tenths or hundredths.Fractions of a second are usually denoted in decimal notation, i.e. Multiples of seconds are usually expressed as minutes and seconds, or hours, minutes and seconds of clock time, separated by colons, such as , or (the latter notation can give rise to ambiguity, because the same notation is used to denote hours and minutes).It rarely makes sense to express longer periods of time like hours or days in seconds, because they are awkwardly large numbers.

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