Transcript Slide 1

Length
Time
Units
and Measurements
Mass
Physics
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Mass (Kilogram)
Electric Current (Ampere)
Time (Second)
Temperature (Kelvin)
Ammount of Substance (mol)
Length (Metre)
Luminous Intensity (Candela)
Three Basic Units of SI Units (le Système international d'unités )
• Mass (kilogram)
• Length (metre)
• Time (second)
Length (metre)
Mass (kg)
Unit
Unit
Unit
kilometre
Megatonne
metre
day
tonne
centimetre
hour
kilogram
millimetre
minute
gram
mikrometre
second
milligram
nanometre
millisecond
Time (second)
Symbol
Numberofofkilograms
metre
Symbol Number ofNumber
Symbol
seconds (minutes or
km
Mt
1hours)
0001000
000 m
000 kg
1 m24
d mt
86 400 s (1440 min,
1 000
kghours)
h cm
36000.01
s1 kgm
kg
min mm
g
s µm
mg
0.001
m
600.001
s
kg
0.000
m
1 s 001 kg
0.000001
ms nm
0.000
0.001 000
s 001 m
The metric prefixes
The Power of Ten Shorthand
The Standard Notation
•• The
5 speed of=light =5 x300
1 000 km/s
• 50
=
=5 x310
x 1105 km/s
• 500
=
5 x 102
•• The
diameter
5 000
000 = of bacteria
5 x 106=
=
• 0.05
=
5 x 10-2
=
-7
• 0.0000005 =
5 x 10
=
0.002 µm
2 x 10-3 µm
0.000000002 m
2 x 10-9 m
Exercises
1.
2.
How many millimeters are there in:
a) 1 cm
b) 4 cm
c) 0.5 cm
d) 6.7 cm
e) 1 m
What are these length in meter?
a) 300 cm
b) 550 cm c) 870 cm
d) 43 cm
e) 100 mm
3.
Write the following as powers of ten with one figure before the
decimal point:
a) 100 000 b) 3500
c) 428 000 000 d) 504
e) 27 056
4.
Write the following in full:
a) 103
b) 2 x 106 c) 6.9 x 104
5.
d) 1.34 x 102 e) 2.12 x 105
Write these fractions as power of ten:
a) 1/1000
b) 7/1000 000 c) 21/100 000