STANDARD TIME Flashcards
1
Q
What are the two required aspect for standard time?
A
The two required aspect of standard time are:
- It is required to know the time of the day so that the event of the day will be ordered in sequence.
2.Itis also required to know what time or period an event has lasted
2
Q
What are the phenomenon For a substance that can measure time?
A
- Any phenomenon that repeat itself in a regular periodic Pattern can be used to measure time.
- The measurements consists of counting and recitations as time proceeds.
3
Q
What are the examples of systems that repeat itself with time in a regular fashion?
A
- Oscillations of simple pendulums(used the in making of pendulum walled clock)
- Rotation of earth on its axis (one complete rotation gives a day)1/86400 of a mean polar day.
- Oscillation of coiled spring (used in making mechanical watches)
- Oscillation of quartz crystal(used in making most electronics watches)
4
Q
unit for length
A
Meter
4
Q
What are the reasons behind the slightly period of rotation of earth time to time?
A
- Total friction between water and land.
- Motion of the winds
3.Melting of ice located in the pole - Shifting. Earth’s plates
4
Q
What is the standard unit for mass?
A
Kilogram
4
Q
centi gives?
A
10^-2
4
Q
units for time
A
seconds
4
Q
milli gives ?
A
10^-3
4
Q
Pico gives
A
10^-12
4
Q
deci gives?
A
10^-1
5
Q
Nano gives?
A
10^-9
5
Q
Fanto
A
10^-15
5
Q
atto
A
10^-18
5
Q
S.i unit of force?
C.G.S unit of force?
A
Newton
Dyne
