What are the two required aspect for standard time?
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
What are the phenomenon For a substance that can measure time?
- 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.
What are the examples of systems that repeat itself with time in a regular fashion?
- 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)
unit for length
Meter
What are the reasons behind the slightly period of rotation of earth time to time?
- Total friction between water and land.
- Motion of the winds
3.Melting of ice located in the pole - Shifting. Earth’s plates
What is the standard unit for mass?
Kilogram
centi gives?
10^-2
units for time
seconds
milli gives ?
10^-3
Pico gives
10^-12
deci gives?
10^-1
Nano gives?
10^-9
Fanto
10^-15
atto
10^-18
S.i unit of force?
C.G.S unit of force?
Newton
Dyne
The relations between Newton and Dyne is
1N = 10^5 Dyne.
S.i unit of Momentum is
Newton second
micro gives?
10^-6
The CGS unit of Momentum is
Dyne second
three fundamental quantities are
mass, length and Time
MLT
Relation between NS and DS
1NS = 10^5DS
