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Time
This category is for questions about the methods humans go about measuring the passage of time. You can also find questions about converting one unit of time to another.
9,512 Questions
How many divisions are there in the clock?
A clock dial has 60 minute divisions on its face, and 12 hour divisions
How many minutes between twenty seven minutes past eight and fifty three minutes past two?
There are 398 minutes between twenty seven minutes past eight and fifty three minutes past two.
How many nanoseconds are in one millisecond?
A nanosecond is 10-9 seconds. A millisecond is 10-3 seconds. There are 103 nanoseconds in a millisecond.
What types of energy is used to run a clock?
Clocks can be powered by a variety of energy sources, such as batteries, electricity, mechanical springs, or solar power. The specific type of energy used depends on the design and mechanism of the clock.
What happens every minute on earth?
On Earth, approximately 250 babies are born, 100 lightning bolts strike the ground, and 40,000 tons of meteoroids fall into the atmosphere.
What comes right after seconds milliseconds or nanoseconds?
It is a millisecond 'cause it's a tenth of a second. I am in 5th grade and I know that
How long does it take for sunlight to reach the moon?
The moon is 238,855.086 miles from Earth.
The speed of light is 670,616,629 mph.
Therefore:The minimum distance from the sun to the moon is 91,238,855.1 miles.The maximum distance from the sun to the moon is 94,738,855.1 miles.
Therefore:The amount of time it takes for light to travel from the sun to the moon can beanywhere from 6.11862934 × 1016 hours to 6.35334516 × 1016 hours.
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I have a couple of comments. Everybody else has already had a dip
in this pool, so I guess I can jump in too without getting hurt:
-- The first answer is a beautiful example of what happens when you put all of
your trust in your calculator or your computer. A truly amazing job of gathering
all the right numbers, and working through them for an answer, but he still made
a humongous mistake ... multiplying instead of dividing ... and he never caught it.
Why do you think that happened ? My answer is: No matter how complicated and
technical the problem and the process of solving it may be, the answer has to
satisfy your brain before you send it out there. That means you must stand back,
look at your answer, and ask "Does this answer make sense ?" Regardless of what
the calculator may say, your gut has to buy it. If your gut has no clue, then you're
at the mercy of your machines. That's a dangerous place to be, as you can plainly
see by looking back at the first answer.
-- The moon revolves around the Earth. So it's closer to the sun than we are for
half the time, and farther from the sun than we are for the other half of the time.
When you average that out, the moon is, on the average, exactly the same
distance from the sun as the Earth is, so it takes sunlight exactly the same length
of time to reach the Moon, on the average, that it takes to reach the Earth.
That's 8minutes and 20seconds . On the average.
-- The first contributor got wound up in his numbers, all with good intentions, and
ended up with kind of a mish-mash. When it came to doing his final calculations,
he used severely rounded figures for the Earth's aphelion and perihelion radii,
(nearest and farthest distances from the sun), but then took the average value of
a number that gyrates wildly ... the moon's distance from Earth ... and wrote that
one to a precision of nine ( ! ) significant figures. His figure for the speed of light
in mph is right on.
-- I shall now commit a maneuver that will mark me as one of the lowest forms of
life in the Q&A world: I'll take the numbers that the first contributor collected with
so much toil, sweat, and tears, fix his little computational error, and present the
result as my own work.
Here I go:
Answer:Earth ranges from 91 million miles to 94.5 million miles from the sun.The moon is 238,855.086 miles from Earth.
The speed of light is 670,616,629 mph.
Therefore:The minimum distance from the sun to the moon is 91,238,855.1 miles.The maximum distance from the sun to the moon is 94,738,855.1 miles.
Therefore:The amount of time it takes for light to travel from the sun to the moon can beanywhere from 489.8 seconds to 508.6 seconds.
The number of vibrations that occur in 1 second is called?
The number of vibrations that occur in 1 second is called frequency. It is typically measured in hertz (Hz), where 1 Hz equals 1 vibration per second.
Light gates are simple optical circuits that have an opening between an emitter and receiver. If the path between the two is interrupted, a signal is sent to a computer or other data recorder. Some gates work in continuous mode, meaning the signal is different when the light is blocked, for example high or low voltage. Others work in pulsed mode, which responds by giving a pulse whenever the 'state' of on or off changes. And a third kind send a signal continuously while the path is open, and simply stop the signal when the path is broken.
These gates are typically used for timing and detection. Many automatic garage doors use a light gate to detect whether the door will come down on something (or someone!).
This question is easily answered. At 100 km/h, 100 km are traversed in one hour. Thus, it would take 1.1 hours to reach New York, which is 66 minutes.
Why is a minute divided into 60 seconds?
The division of a minute into 60 seconds is believed to originate from ancient Mesopotamia, where they used a base 60 numbering system. This system was later adopted by the Babylonians and eventually spread to other cultures. The number 60 is easily divisible by many numbers, making it a practical choice for time measurement.
How did you measure time before the clock was invented?
You looked (though not too directly) at the sun. Later you used arrangements of rocks and calculated time by shadows, and later still, sundials became popular. The peasants simply got up at daylight and went to bed when the sun had gone well down, to save on candles. In between they tended crops and cattle at the appropriate time. Crops and cattle tend to let you know if you're getting it wrong; crops wither and cows and pigs and goats and so on wake you up in the night if they're not comfortable. But only a very bad farmer would get it wrong, and didn't need a clock to get it right. Flower clocks were created as a novelty, but still told the time. The first mechanical clocks were a novelty, and for the wealthy, who in any case had servants to take note of when the sun rose.
light gates are simple optical circuits that have an opening between an emitter and receiver. If the path between the two is interrupted, a signal is sent to a computer or other data recorder.
light gates are typically used for timing and detection.
Why is a clock's pendulum shortened in summer?
I didn't know that this is standard practice, but it certainly makes sense ...
In modern clocks, the pendulum rod is some solid material such as metal or wood. In either case, long-term higher temperature would cause the rod to expand slightly, which in turn would slightly lengthen the pendulum's period. Doesn't have to be much, but the clock definitely slows down, and loses time over an extended period.
In order to compensate for the lengthening of the pendulum and slowing of the clock when the temperature rises, the rod should be slightly shortened.
How are time and distance related?
Time and distance are related through the concept of speed, which is the measure of how quickly an object travels a certain distance over a specific period of time. The formula for speed is Distance = Speed × Time, which shows that the distance covered is directly proportional to the speed at which an object moves and the time taken to reach that distance.
You almost answered your own question, clock work spring. Analog clocks were wound up, the main spring was wound up by a key, some every two or three days, and some would run by being wound once a year. Today you will still here about clock work inventions, like the clockwork radio, and the clockwork torch, they are also wound up. These modern inventions on an old theme, last for the period the winder is turned to provide power to the battery.
Hope this helped see more on-line.
What is one billisecond of a second?
There is no such unit as a billisecond. A billionth of a second (10-9 s) is called a nanosecond.
There is currently no scientific evidence to support the existence of time travelers. The concept of time travel remains theoretical and has not been proven to be possible within the laws of physics as we currently understand them.
Millions of years ago. and similarly, Gya for Giga years ago (~ Billion).
This usage avoids the confusion between various folks definitions of billion etc. And uses the prefix/suffix definitions produced by the International Bureau of Weights and Measures. (look for BIPM in Wikipedia.org )
How many minutes are in a micro-century?
Micro means 0.000001, a century is 100 years. Therefore a microcentury is 0.0001 years, or 0.0365.25 days or 0.8766 hours or 25.596 minutes.
How many years is one thousand days?
Well there are 365 days in a year (366 in a leap year) so say 365.25 to even it out.
1000000/365.25 = 2737.8507871321013004791238877481 years
and there are 12 months in each year.
2737.8507871321013004791238877481 * 12 = 32854.209445585215605749486652977 months
or There are an average of 30.4375 days per month. 1,000,000 divided by 30.4375 will get you the same number.
No such conversion is possible; Seconds measure time, Litres measure volume (1 US gallon = 3.78 litres, 1 UK gallon = 4.55 litres).
