Happy Birthday National Geographic (1888)Homework 2.1 – Due Thursday 1/29/15
Chapter 2 #s 1, 2, 4, 8-28 (even), 32, 34, 80, 86, 88Homework 2.2 – Due Tuesday 2/3/15
Chapter 2 #s 38-48 (even), 56-76 (even), 84, 92, 94Reading for Thursday – Chapter 3 sections 6, 8-9
189000001.8900000
Scientific Notation – Numbers > 1 Place a decimal so that there is a single digit to the left
1.8900 00 0
Start counting from the right until you get to the decimal
This becomes the exponent for “times 10 to the”1.8900000x107
Remove digits from the right until proper # of sig. figs.
1.8900000x1071.890000x1071.89000x1071.8900x1071.890x1071.89x107
1324567
7.1611x1057.1611x1057.16110x105
7161107.16110
Scientific Notation – Numbers > 1 Place a decimal so that there is a single digit to the left
7.16110
Start counting from the right until you get to the decimal
This becomes the exponent for “times 10 to the”7.16110x105
Remove digits from the right until proper # of sig. figs.
12345
Start counting from the decimal point to the first non-zero digit. This will be the exponent in the “times ten to the negative”
7022169
Scientific Notation – Numbers < 1
0. 500000
Move the decimal point to the right of the first non-zero digit, drop all of the leading zeros, and add the “times ten to the negative” with the exponent.
5.7022169x10-7
01 32 4567
Start counting from the decimal point to the first non-zero digit. This will be the exponent in the “times ten to the negative”
510
Scientific Notation – Numbers < 1
0. 9000
Move the decimal point to the right of the first non-zero digit, drop all of the leading zeros, and add the “times ten to the negative” with the exponent.
9.510x10-5
01 32 45
Did you get it?512384000 4 s.f.0.0006000 2 s.f.0.00251634 5 s.f.3540000000 5 s.f.
5.124x108
6.0x10-4
2.5163x10-3
3.5400x109
Percentspercent out of, over
percent 100
percent out of 100 or over 100
11.2 %11.2100
11.2 percent 11.2 out of 100
Used to talk about a part of a group or sample that has a certain characteristic.
28.17 %28.17100
28.17 percent 28.17 out of 100
88.8100
oxygen
water
mass unit
mass unit
Percents
100specific PART of a sample
percent entire sample
88.8% of the mass of water is made up by oxygen
88.8100
oxygen is PART OF water, water is NOT part of oxygen
11.2100 2
O
H O
g
g
11.2100 2
O
H O
lb
lb
unit
unit
Percents
100specific PART of a sample
percent entire sample
Left-handers account for 8.3% of people
8.3100
Left-handers are PART OF people, people are NOT part of left-handers
8.3100 people
people
lefties
iron
body
mass unit
mass unit
Percents
100specific PART of a sample
percent entire sample
0.0060% of the mass of the human body is made up by iron
0.0060100
iron is PART OF the body, body is NOT part of iron
0.0060100
Fe
body
kg
kg
0.0060100
Fe
body
oz
oz
female studentsall SCC students
Percents
1998135554
100specific PART of a sample
percent entire sample
56.199100
0.56199
56.199 %
In Spring 2012, 19981 of the 35554 registered students at SCC were female.
x 100
Females are PART OF the student body, the student body is NOT part of females
56.199 % females
all students
56.199100
golden retrieversdogs
Percents
663001175473
100specific PART of a sample
percent entire sample
5.64100
0.0564
5.64%
In 2000, golden retrievers accounted for 66300 of the 1175473 dogs registered in the United States.
x 100
Golden retrievers are PART OF dogs, gods are NOT part of golden retrievers
5.64 % 5.64
100golden retrievers
dogs
Types of Units (Quality Measured)Distance (length)
foot, inch, mile, yard, meter, centimeter, rodMass/Weight
gram, kilogram, ton, pound, ounce, stone
Volumegallon, quart, pint, milliliter, liter, cubic
centimeter (cm3, cc)Time
second, minute, hour, year, microsecond, eon
What quality is measured by…?kg
oC
cm
cm3
mL
ft2
mass
area
temperature
length/distance
volume
volume
12 in 12 in
12 in 1 ft _12 in =12 in
Dimensional Analysis(unit conversion)
1 ft1 ft _12 in =12 in 1=
12 in =1 ft1 ft1 ft =1 ft 11 ft =
Conversion between feet and inches can be written either:
12 in 1 ft _ 12 in
1 ft OR
Unit equation
These are called “Unit Factors”
____________________
Dimensional Analysis(unit conversion)
The Goal:Convert one unit to another
How:Use conversion factors
Use them so that
12 in 1 ft _ 12 in
1 ft OR
Unit you want to keepUnit you want to cancel
in
f
t
in1251.5
1
in in
ft
1251.5
1
Dimensional Analysis(unit conversion)
How many feet are in 51.5 inches?
12 in 1 ft _ 12 in
1 ft OR
in 51.5
ft
in in
151.5
12in
f
i
n
t151.5
12 in
i
ftft
n
151.5 4.291666666
12
ftft
in
in
151.5 4.29
12
D.A. PracticeI have a 100.0 fluid ounce CamelBak. How many gallons is my CamelBak?
D.A. PracticeI have a 100.0 fluid ounce CamelBak. How many gallons is my CamelBak?
1 1100.0 0.7813
32 4 fl.oz.
fl.oz
qt
q
g
. t
algal