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How do you calculate 4 hours in seconds?
…
Convert 4 Hours to Seconds.
| hr | s |
|---|---|
| 4.00 | 14,400 |
| 4.01 | 14,436 |
| 4.02 | 14,472 |
| 4.03 | 14,508 |
How long is 1 second in seconds?
Today, one second is defined as “9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom”.
How long is 1 minute exactly?
The minute is a unit of time usually equal to 160 (the first sexagesimal fraction) of an hour, or 60 seconds.
What part of 1 minute is 1 second?
There are 60 seconds in 1 minute. In other words, a second is 160 of a minute. The second is called the base unit of time. That means scientists defined one minute to be 60 seconds.
How many hours are in a day?
Overall, the Earth is a good timekeeper: the length of a day is consistently within a few milliseconds of 86,400 seconds, which is equivalent to 24 hours.
Who created the second?
The Persian scholar Al-Biruni first used the term “second” around 1000. He defined it—as well as the day, hour, and minute—as fractions according to the lunar cycle.
How long is a day?
A day is commonly divided into 24 hours of 60 minutes, with each minute composed of 60 seconds.
How long is a millisecond?
A millisecond (ms or msec) is one thousandth of a second and is commonly used in measuring the time to read to or write from a hard disk or a CD-ROM player or to measure packet travel time on the Internet. For comparison, a microsecond (us or Greek letter mu plus s) is one millionth (10–6) of a second.
Why is a day 24 hours?
Our 24-hour day comes from the ancient Egyptians who divided day-time into 10 hours they measured with devices such as shadow clocks, and added a twilight hour at the beginning and another one at the end of the day-time, says Lomb. “Night-time was divided in 12 hours, based on the observations of stars.
Who created minutes?
THE DIVISION of the hour into 60 minutes and of the minute into 60 seconds comes from the Babylonians who used a sexagesimal (counting in 60s) system for mathematics and astronomy. They derived their number system from the Sumerians who were using it as early as 3500 BC.
How long is 60minutes?
There are 60 minutes in 1 hour.
Why is it called a second?
Historical origin. Originally, the second was known as a “second minute”, meaning the second minute (i.e. small) division of an hour. The first division was known as a “prime minute” and is equivalent to the minute we know today.
When was the second invented?
…
| second | |
|---|---|
| Symbol | s |
How was the second invented?
Seconds were once derived by dividing astronomical events into smaller parts, with the International System of Units (SI) at one time defining the second as a fraction of the mean solar day and later relating it to the tropical year.
How do you calculate time in seconds?
- 2 hours is 2 hours * (3600 seconds / 1 hour) = 2 * 3600 seconds = 7200 seconds.
- 45 minutes is 45 minutes * (60 seconds / 1 minute) = 45 * 60 seconds = 2700 seconds.
- 45 seconds is 45 seconds * (1 second / 1 second) = 45 * 1 seconds = 45 seconds.
How do you calculate seconds?
The time in seconds is equal to the hours multiplied by 3,600.
How do you calculate seconds in a day?
One minute has 60 seconds, One hour has 60 minutes and one day has 24 hours. Thus, 80 x 60 x 24 = 86,400 seconds in a day.
Convert 4 Hours to Seconds
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Why 1 Second Is 1 Second | Discover Magazine
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Today’s seconds are defined in terms of movements inside atoms of the element cesium
Newsletter
Not Enough Time
Endless Flipping
Minute – Wikipedia
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Minutes to Seconds — Conversion & Practice – Expii
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How many seconds are 4 hours
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How many seconds are 4 hours
¿How many s are there in 4 h
Convert 4 Hours to Seconds
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4 hours in seconds | How long is 4 hours?
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4 Hours In Seconds – How Many Seconds Is 4 Hours?
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4 Hours to Seconds | 4 h to sec
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Convert 4 hours to seconds – Time Calculator
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4 hr to sec – How long is 4 hours in seconds? [CONVERT] â
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4 hr to sec – How long is 4 hours in seconds? [CONVERT] â
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Convert 4 Hours to Seconds
Convert 4 Hours to Seconds
How long is 4 hours? What is 4 hours in seconds? 4 hr to s conversion.
From Centuries Days Decades Hours Hours:Minutes:Seconds Microseconds Millenia Milliseconds Minutes Months Nanoseconds Seconds Weeks Work Weeks Years To Centuries Days Decades Hours Hours:Minutes:Seconds Microseconds Millenia Milliseconds Minutes Months Nanoseconds Seconds Weeks Work Weeks Years swap units ↺ Amount 14,400 Seconds (exact result) 4 Hours = Display result as Number Fraction (exact value)
An hour is a unit of time equal to 60 minutes, or 3,600 seconds. second is the base unit of time. Originally, it was based on the length of the day, but it has since been standardized based on the radiation wavelength of caesium-133.
Why 1 Second Is 1 Second
Just what is a second, exactly? The question has been open to interpretation ever since the first long-case grandfather clocks began marking off seconds in the mid-17th century and introduced the concept to the world at large.
The answer, simply, is that a second is 1/60th of a minute, or 1/3600th of an hour. But that’s just pushing the question down the road a bit. After all, what’s an hour? That answer is related to the best means of time-keeping ancient civilizations had — the movement of the Earth through the heavens. The amount of time it takes for the Earth to turn once about its axis, or for it to rotate once about the sun, is fairly stable, and for much of human history, it sufficed as a way of marking the passage of time. Days, hours, minutes — they’re all just derivatives of planetary motion.
Not Enough Time
Today, however, when computers perform operations at the rate of 4 billion cycles per second, we need a better measure. The rotation of Earth, and its orbit, change slightly over time. Earth’s rotation, for example, is slowing slightly. So measuring a second based on rotation would mean that a second would get slowly longer over time. Ultimately, we couldn’t compare the second of today to the second of yesterday.
So, to pin down a truly timeless measure of a second, scientists in the 1950s devised a better clock, one based not on astronomical processes but on the movement of fundamental bits of matter — atoms — whose subtle vibrations are, for all intents and purposes, locked in for eternity. Today, one second is defined as “9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom”.
That’s a mouthful.
That number seems random because each and every definition of a second has by necessity been based on the one that came before. We’ve gotten better at pinning down the exact length of a second, but it still has its roots in ancient astronomical observations. The second today, the one engraved in cesium, is based on a series of observations of the Earth’s orbit by the astronomer Simon Newcomb between 1790 and 1892. It was called the ephemeris second, and was simply a fraction of a year, as defined by Newcomb’s tables. When scientists moved to their new “atomic clock” in 1967, they calibrated it with his measurements.
When hit with a laser, the single electron in a cesium atom’s outermost shell will cycle back and forth between two states — known as a hyperfine transition. It can be magnetically aligned either in the same direction as the atom’s nucleus, or the opposite direction, and under a laser’s beam, it will flip back and forth between these two states rapidly at a rate that never changes. Cesium isn’t the only element for the job, but it has only one stable isotope, so it’s easier to purify, and the hyperfine transition is both large enough and fast enough to be accurate, unlike some other atoms.
Endless Flipping
By isolating and cooling cesium atoms to near absolute zero, researchers can measure each and every flip by the pulse of electromagnetic radiation it gives off. To get a new second, scientists simply counted how many flips occurred within one ephemeris second, and voilà, a better measure of time was born.
This new second wasn’t really any different from the old one, of course. It was the exact same length of time, but now, it would remain permanently fixed. Current atomic clocks are so accurate that they won’t lose a second for more than 300 million years.
But that’s still not good enough for scientists. Atomic clocks play an important role in calibrating computers and GPS systems, among other things, and to get faster processors and better positioning systems, we’ll need even better systems of time-keeping. In 2016, German researchers proposedan even better atomic clock, one based on the element strontium, and which uses optical light, rather than microwave emissions for calibration. Strontium cycles much faster than cesium does, and that would make such an atomic clock even more precise by giving researchers even more data points to work with.
The actual creation of such a clock is still a work in progress, and the cesium atom remains today the ultimate time keeper. Whenever you set your watch, or your phone automatically updates its clock, there’s a cesium atom out there, resonating perfectly in sync with its past, present and future.
Wikipedia
Unit of time equal to 60 seconds
The minute is a unit of time usually equal to 1/60 (the first sexagesimal fraction[1]) of an hour, or 60 seconds. In the UTC time standard, a minute on rare occasions has 61 seconds, a consequence of leap seconds (there is a provision to insert a negative leap second, which would result in a 59-second minute, but this has never happened in more than 40 years under this system). Although not an SI unit, the minute is accepted for use with SI units.[2] The SI symbol for minute or minutes is min (without a dot). The prime symbol is also sometimes used informally to denote minutes of time.[3]
History [ edit ]
Al-Biruni first subdivided the hour sexagesimally into minutes, seconds, thirds and fourths in 1000 CE while discussing Jewish months.[4]
Historically, the word “minute” comes from the Latin pars minuta prima, meaning “first small part”. This division of the hour can be further refined with a “second small part” (Latin: pars minuta secunda), and this is where the word “second” comes from. For even further refinement, the term “third” (1⁄60 of a second) remains in some languages, for example Polish (tercja)[citation needed] and Turkish (salise), although most modern usage subdivides seconds by using decimals. The symbol notation of the prime for minutes and double prime for seconds can be seen as indicating the first and second cut of the hour (similar to how the foot is the first cut of the yard or perhaps chain, with inches as the second cut). In 1267, the medieval scientist Roger Bacon, writing in Latin, defined the division of time between full moons as a number of hours, minutes, seconds, thirds, and fourths (horae, minuta, secunda, tertia, and quarta) after noon on specified calendar dates.[5] The introduction of the minute hand into watches was possible only after the invention of the hairspring by Thomas Tompion, an English watchmaker, in 1675.[6]
See also [ edit ]
Notes and references [ edit ]
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