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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 is second in time defined?
sometimes abbreviated sec., is a unit of measurement of time, and is the International System of Units (SI) base unit of time.[1] It may be measured using a clock.
Early definitions of the second were based on the apparent motion of the sun around the earth.[2] The solar day was divided into 24 hours, each of which contained 60 minutes of 60 seconds each, so the second was 1⁄86 400 of the mean solar day. However, 19th- and 20th century astronomical observations revealed that this average time is lengthening, and thus the sun/earth motion is no longer considered a suitable basis for definition. With the advent of atomic clocks, it became feasible to define the second based on fundamental properties of nature. Since 1967, the second has been defined to be
the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.[1]
SI prefixes are frequently combined with the word secondto denote subdivisions of the second, e.g., the millisecond (one thousandth of a second), the microsecond (one millionth of a second), and the nanosecond (one billionth of a second). Though SI prefixes may also be used to form multiples of the second such as kilosecond (one thousand seconds), such units are rarely used in practice. The more common larger non-SI units of time are not formed by powers of ten; instead, the second is multiplied by 60 to form a minute, which is multiplied by 60 to form an hour, which is multiplied by 24 to form a day.
The second is also the base unit of time in the centimetre-gram-second, metre-kilogram-second, metre-tonne-second, and foot-pound-second systems of units.
Why night is 4 minutes shorter than day?
Depending on where on Earth you are, and what the date is, your night may be
longer or shorter than your day, by any number of minutes. Your day or your
night also may be more than 24 hours long, and can even be 6 months long.
It just depends on where you are, and the time of year.
Is there any relationship between light and time?
In special relativity there is a relationship between light and space and time, or more properly light and spacetime. As the speed of light as defined in Maxwell's equations is determined to be a constant regardless of motion of source or observer, spacetime must warp in a certain way (time dialation & space contraction in the direction of observed motion) to maintain meaningful measurements that agree in a sensible way between reference frames having different motion. Using the right relationship, despite changes in measured rate of time and lengths in space between observers in different frames they can all get the same values for intervals between events.
With distances measured in meters and time measured in meters of light travel time, the interval in meters is:
I = √( X2 + Y2 + Z2 - T2 )
What are the factors affecting the use of time and energy?
Time is caused by a particle that I discovered, the Graviton. Graviton particles orbit all atoms & create gravity & inertia by simply bumping into everything.
Gravitons have a constant & predictable velocity that exceeds 10,000 times the speed of light. An alarm clock, for example, has a part called the escapement which measures inertia and graviton impacts. If you take your alarm clock to the Moon for example, it will run way too fast because there are 5/6 ths fewer graviton impacts on the Moon.
The use of any energy that is affected by inertia will speed in the same way....Alfred Schrader
Your 65 milliseconds is 65 thousandths of a second, or 0.065 seconds, or 65/1000 seconds. One 20th (1/20th) of a second is 0.050 seconds, so this is a bit longer. A millisecond is one one thousandth (1/1000th) of a second.
What is the difference time between Philippines and Taipei?
The time difference between the Philippines and Taipei is one hour, with Taipei being one hour ahead of the Philippines.
How is the fourth dimension the time?
The fourth dimension is not "time'. The fourth dimension is a real space dimension r=ct, where c is the speed of light and the fourth dimension r is the product of 'c' and time which gives a real number distance. The other three dimensions are vector dimensions V= Ix + Jx + Ky. The vectors I, J and K are unit vectors with the vector property I2=J2=K2=IJK= - 1.
So, all the dimensions are units of space!
SI units for time length speed and velocity?
SI units:
time:second
length: meter
speed:meter/second
velocity:meter/second.
What number do you call to get current time?
From what I know "123" is the number you call to get the time.
What is faster 210 nanoseconds or 2 nanoseconds?
Same answer as if you replaced the word "nanoseconds" with the word "years".
Let me show you how to do it:
What is faster, 210 years or 2 years ?
Now can you guess ?
How many nanoseconds are in a megayear?
There are 3.1536 x 10^16 nanoseconds in a megayear, which is equivalent to one million years.
Who tried to build a time machine?
One famous person who tried to build a time machine was H.G. Wells, a British writer who wrote "The Time Machine" in 1895. The protagonist in his novel invents a machine that allows him to travel through time.
If its 10pm in the US what time is it in Norway?
If it's 10 pm in the US, it would be 4 am in Norway. Norway is 6 hours ahead of Eastern Standard Time in the US.
How many seconds are in one decade?
There are 315,360,000 seconds in a decade. This is calculated as 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, 365.25 days in a year, and a decade being 10 years.
How many 3600 seconds are in an hour?
There are only one group of 3600 seconds in one hour. One hour is equal to 3600 seconds.
Does 1200 PM mean before midnight or after?
No, 11 AM is right before noon, 12 PM. 11 PM is right before midnight 12 AM.
What term explains wheather an objects velocity has increased or decreased over time?
You're fishing for "acceleration", but your description doesn't support that answer.
Acceleration is also present if the direction of motion has changed, even if the speed
(the size of velocity) hasn't changed.
If it is 5pm in America what time is it in India?
California is 13 hours behind India, so if it were 1:15 PM in California, it would be 3:15 AM the next day in India.
How far does the earth move every minute?
It would be convenient to specify which of Earth's movements you are talking about. In the yearly movement around the Sun, Earth moves at a rate of 30 km per second.
