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What is time?

Plusmagazine interviews experts on everything from the beginning of time to time travel.

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Subrahmanyan Chandrasekhar

Subrahmanyan Chandrasekhar (1910 - 1995) In 1930 he showed that a star of a mass greater than 1.4 times that of the Sun had to end its life by collapsing into an object of enormous density unlike any ...

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National Earthquake Information Centre - Near real time earthquake list

Contains information on the most recent earthquakes around the world - less than 14 hours ago. Also data - predicted p-wave times for example. An excellent site for keeping abreast of the latest ...

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Time

The Official Source of Time for the Department of Defense and the Standard of Time for the United States.

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A Walk Through Time

How do you measure time? A guided tour of the history of the measurement of time from ancient calendars and sun dials to modern day atomic clocks.

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International Standard Date and Time Notation

An outline of ISO 8601, the internationally agreed date and time format. It specifies the numeric representation of date and time.

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Calculation of the Reverberation Time in a Room

Input variables such as dimension of room, construction materials, type of furniture etc. and Sabine Reverberation Time, Eyring Reverberation Time are calculated.

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Displacement-Time Graph and Velocity-Time Graph

This simulation shows two graphs where the user can vary initial displacement, velocity and acceleration and see the corresponding changes to the Displacement-Time and Velocity-Time Graphs.

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Constant Negative Velocity

Shows, by means of simple animation, the displacement time, velocity time, and acceleration time graphs for an object moving at constant negative velocity.

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Constant Positive Velocity

Shows, by means of simple animation, the displacement time, velocity time, and acceleration time graphs for an object moving at constant positive velocity.

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