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