Physics Notes - Herong's Tutorial Notes

∟Introduction of Time

∟Second Prefixes and Other Units

This section introduces prefixes used on 'second' to represent decadic multiples or fractions of a second. It also covers other standard units to measure durations like minute, hour, day and year.

For the convenience of measuring a very long or very short duration, some prefixes have been defined on "seconds" to be decadic multiples or fractions of a second. Here are some commonly used meter prefixes and their abbreviated symbols:

Prefix   Name         Symbol   Definition

peta     petasecond   Ps       1 000 000 000 000 000 second
tera     terasecond   Ts       1 000 000 000 000 second
giga     gigasecond   Gs       1 000 000 000 second
mega     megasecond   Ms       1 000 000 second
kilo     kilosecond   ks       1 000 second
         second       s        1 second
milli    millisecond  ms       0.001 second
nano     nanosecond   ns       0.000 000 001 second
pico     picosecond   ps       0.000 000 000 001 second
femto    femtosecond  fs       0.000 000 000 000 001 second

Beside "second", other standard units are also used to measure duration. For example:

• "minute" - "minute" is defined as 1 minute = 60 seconds.
• "hour" - "hour" is defined as 1 hour = 360 seconds, or 60 minutes.
• "day" - "day" is defined as 1 day = 86,400 seconds, or 24 hours.
• "year" - "year" is defined as 1 year = 31,557,600 seconds, or 365.25 days.

Table of Contents

 About This Book

 Introduction of Space

 Introduction of Frame of Reference

►Introduction of Time

 What Is Time

 What Is Duration

►Second Prefixes and Other Units

 List of Various Durations

 Introduction of Speed

 Newton's Laws of Motion

 Introduction of Special Relativity

 Time Dilation in Special Relativity

 Length Contraction in Special Relativity

 The Relativity of Simultaneity

 Introduction of Spacetime

 Minkowski Spacetime and Diagrams

 Introduction of Hamiltonian

 Introduction of Lagrangian

 Introduction of Generalized Coordinates

 Phase Space and Phase Portrait

 References

 Full Version in PDF/ePUB

Second Prefixes and Other Units - Updated in 2022, by Herong Yang