Happy Birthday National Geographic (1888) Homework 2.1 – Due Thursday 1/29/15 Homework 2.1 – Due Thursday 1/29/15 Chapter 2 #s 1, 2, 4, 8-28 (even), 32, 34, 80, 86, 88 Chapter 2 #s 1, 2, 4, 8-28 (even), 32, 34, 80, 86, 88 Homework 2.2 – Due Tuesday 2/3/15 Homework 2.2 – Due Tuesday 2/3/15 Chapter 2 #s (even), (even), 84, 92, 94 Chapter 2 #s (even), (even), 84, 92, 94 Reading for Thursday – Chapter 3 sections 6, 8-9 Reading for Thursday – Chapter 3 sections 6, 8-9

Scientific Notation – Numbers > 1 Place a decimal so that there is a single digit to the left Start counting from the right until you get to the decimal This becomes the exponent for “times 10 to the” x10 7 Remove digits from the right until proper # of sig. figs x x x x x x

7.1611x x Scientific Notation – Numbers > 1 Place a decimal so that there is a single digit to the left Start counting from the right until you get to the decimal This becomes the exponent for “times 10 to the” x10 5 Remove digits from the right until proper # of sig. figs

Start counting from the decimal point to the first non- zero digit. This will be the exponent in the “times ten to the negative” Scientific Notation – Numbers < 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 x

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 < 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 x

Did you get it? s.f s.f s.f s.f s.f s.f s.f s.f x x x x10 9

Percents percent  out of, over percent  100 percent  out of 100 or over %  11.2 percent  11.2 out of 100  Used to talk about a part of a group or sample that has a certain characteristic %  percent  out of 100 

Percents 88.8% of the mass of water is made up by oxygen oxygen is PART OF water, water is NOT part of oxygen

Percents Left-handers account for 8.3% of people Left-handers are PART OF people, people are NOT part of left-handers

Percents % of the mass of the human body is made up by iron iron is PART OF the body, body is NOT part of iron

Percents   %  In Spring 2012, of the registered students at SCC were female.   x 100 Females are PART OF the student body, the student body is NOT part of females % 

Percents   5.64%  In 2000, golden retrievers accounted for of the dogs registered in the United States.   x 100 Golden retrievers are PART OF dogs, gods are NOT part of golden retrievers 5.64 % 

Types of Units (Quality Measured) Distance (length) Distance (length) foot, inch, mile, yard, meter, centimeter, rod foot, inch, mile, yard, meter, centimeter, rod Mass/Weight Mass/Weight gram, kilogram, ton, pound, ounce, stone gram, kilogram, ton, pound, ounce, stone Volume Volume gallon, quart, pint, milliliter, liter, cubic centimeter (cm 3, cc) gallon, quart, pint, milliliter, liter, cubic centimeter (cm 3, cc) Time Time second, minute, hour, year, microsecond, eon second, minute, hour, year, microsecond, eon

What quality is measured by…? kg oCoCoCoC cm cm 3 mL ft 2 mass area temperature length/distance volume volume

12 in 1 ft _ 12 in =12 in Dimensional Analysis (unit conversion) 1 ft1 ft _ 12 in = 1 = 12 in = 1 ft = 1 = 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: The Goal: Convert one unit to another Convert one unit to another How: How: Use conversion factors Use conversion factors Use them so that Use them so that 12 in 1 ft _ 12 in 1 ft OR Unit you want to keep Unit you want to cancel

Dimensional Analysis (unit conversion) How many feet are in 51.5 inches? 12 in 1 ft _ 12 in 1 ft OR

D.A. Practice I have a fluid ounce CamelBak. How many gallons is my CamelBak?

D.A. Practice I have a fluid ounce CamelBak. How many gallons is my CamelBak?