Basic Physics-Week1-Measurement
Basic Physics-Week1-Measurement
Basic Physics-Week1-Measurement
MEASUREMENT IN PHYSICS
Physics is based on measurement of
physics quantities, such as
Length
Time
Mass
Temperature
Electric Current
Pressure
etc
The History
SI UNITS
Le Systme International
dUnits
: kilogram (kg)
3. Unit of time
: second (s)
1 ft
= 0.3048 m
1 mi
= 1.609 km
1 hp
= 746 W
1 liter = 10-3 m3
3.281 feet
Length 979.0 meters
3212 feet
1 meter
miles
miles 5280 feet 1 hour
feet
Speed 65
11 65
95
hour
hour
mile 3600 s
second
feet
feet
Speed 95
1 95
second
second
1 meter
meters
29
second
3.281 feet
DIMENSIONAL ANALYSIS
Length
Time
Mass
meter
second
Kg
[L]
[T]
[M]
[L]
[speed] =
[T]
TRIGONOMETRY
ho
sin
h
ha
cos
h
ho
tan
ha
ho
tan
ha
ho
tan 50
67.2m
ho
sin
h
1
ha
cos
h
1
ho
tan
ha
1
ho
tan
ha
1
2.25m
tan
9.13
14.0m
1
Assignment
1. The standard kilogram is a platinumiridium cylinder 39.0 mm in
height and 39.0 mm in diameter. What is the density of the material?
2. A major motor company displays a die-cast model of its first
automobile, made from 9.35 kg of iron. To celebrate its hundredth year
in business, a worker will recast the model in gold from the original
dies. What mass of gold is needed to make the new model?
3. A rectangular building lot is 100 ft by 150 ft. Determine the area of
this lot in m2.
4. An auditorium measures 40.0 m ! 20.0 m ! 12.0 m. The density of air
is 1.20 kg/m3. What are (a) the volume of the room in cubic feet and
(b) the weight of air in the room in pounds?
5. Find the height or length of these natural wonders in kilometers,
meters and centimeters. (a) The longest cave system in the world is
the Mammoth Cave system in central Kentucky. It has a mapped
length of 348 mi. (b) In the United States, the waterfall with the
greatest single drop is Ribbon Falls, which falls 1 612 ft. (c) Mount
McKinley in Denali National Park, Alaska, is Americas highest
mountain at a height of 20 320 ft. (d) The deepest canyon in the