measurement
Post on 12-Jan-2016
32 Views
Preview:
DESCRIPTION
TRANSCRIPT
UNIT CONVERSIONS
MEASUREMENT
3
3
cm
gcm
Dimensional Analysis
The “Factor-Label” Method Units, or “labels” are canceled, or “factored” out
g
Dimensional Analysis
Steps:1. Identify starting & ending units.
2. Line up conversion factors so units cancel.
3. Multiply all top numbers & divide by each bottom number.
4. Check units & answer.
Dimensional Analysis
Lining up conversion factors:
1 in = 2.54 cm
2.54 cm 2.54 cm
1 in = 2.54 cm
1 in 1 in
= 1
1 =
Dimensional Analysis
How many milliliters are in 1.00 quart of milk?
1.00 qt 1 L
1.057 qt= 946 mL
qt mL
1000 mL
1 L
Dimensional Analysis
You have 1.5 pounds of gold. Find its volume in cm3 if the density of gold is 19.3 g/cm3.
lb cm3
Dimensional Analysis
How many liters of water would fill a container that measures 75.0 in3?
=
in3 L
B. Dimensional Analysis
5) Your European hairdresser wants to cut your hair 8.0 cm shorter. How many inches will he be cutting off?
cm in
Dimensional Analysis
6) Hammonton football needs 550 cm for a 1st down. How many yards is this?
cm yd
Dimensional Analysis
7) A piece of wire is 1.3 m long. How many 1.5-cm pieces can be cut from this wire?
m pieces
Dimensional Analysis
8) The speed limit on my street is 35 mph, what is that equivalent to in m/s ?
mi/hr m/s
Dimensional Analysis
9) The Density of Copper is 8.9g/cm3. What is its density in lb/ft3 ?
g/cm3 lb/ft3
Percent Error
Indicates accuracy of a measurement
100literature
literaturealexperimenterror %
your value
accepted value
Percent Error
A student determines the density of a substance to be 1.40 g/mL. Find the % error if the accepted value of the density is 1.36 g/mL.
100g/mL 1.36
g/mL 1.36g/mL 1.40error %
% error =
Proportions
Direct Proportion
Inverse Proportion
xy
xy
1
y
x
y
x
top related