Agenda (CP) Check off and go over HW Lab Safety Quiz (open notes) Fire Evacuation Spot Start “Physics Activity #1”

HW Answers 17) 6 x 105 18) 2 x 10-6 19) 6.7 x 10-4 20) 3.9 x 108 21) 9.45 x 108 22) 5.28 x 10-6

HW Answers 23) 8000 24) 0.02 25) 55000 26) 0.0000892 27) 67100000 28) 0.00722

Agenda (ED) Safety Video / Lab Safety First Quiz on Friday 9/5/14 “Lab Safety” (open note) The Dreaded Stairs White Boards Presentation

Scientific Notation 9/4/14

Agenda (CP) Go over HW Math Skills and Physics First Quiz on Friday 9/5/14 “Lab Safety” (open note) Scientific Notation #HW 17-28 Experimental Design ALL beginning year forms due by Friday 9/5/14

Scientific Notation

Scientific Notation Scientific Notation: A way to write very large or very small numbers in a compact way Use scientific notation for numbers larger then 10,000 and smaller then 0.001

Scientific Notation The components of scientific notation: 8.238 x 10-31 “8.238” is the coefficient “x 10” is the base “-31” is the exponent Where the coefficient has to be a number: 1 ≤ coefficient < 10

Scientific Notation The Andromeda Galaxy contains at about 200,000,000,000 stars. Mass of a dust particle is 0.000000000753 kg .

Scientific Notation 200,000,000,000 stars. In scientific notation is: 2 x 1011 stars

Scientific Notation 0.000000000753 kg In scientific notation is: 7.53 x 10-10

Decimal Notation Given: 3 x 106 Is: 3000000 Given: 2.84 x 10-7

HW Answers 17) 6 x 105 18) 2 x 10-6 19) 6.7 x 10-4 20) 3.9 x 108 21) 9.45 x 108 22) 5.28 x 10-6

HW Answers 23) 8000 24) 0.02 25) 55000 26) 0.0000892 27) 67100000 28) 0.00722

Rounding Calculations 8/21/13

Rounding to Sig. Figs. Multiplication and division of numbers After the calculation, round the answer to the number that has the least amount of sig. figs. Note: Addition and subtraction have different rules

Sig. Figs. Exceptions in Calculations Conversion factors (metric conversion) Scaling factors Counting number (EX: number of trials or number of students) Round to sig. figs. At the END of a calculation

Estimation vs. Measurement What is the volume of the room? Estimation: Length: 17 m Width: 7 m Height: 3 m Volume = 357 m3 Volume = 400 m3 Measurement: Length: 14.53 m Width: 9.56 m Height: 2.68 m Volume = 372.270224 m3 Volume = 372 m3

Scientific Notation (calculators) USE THE EXPONENT FUNCTION (4.8 x 10-6) / (5.134 x 10-19) = 9.349435138 x 1012 Displays will differ 9.3 x 1012 (2 sig. figs.)

Scientific Notation When writing numbers in scientific notation Express numbers as 4.71 x 10-61 4.71-61 ≠ 4.71 x 10-61 4.71-61 = 8.83 x 10-42 4.71E-61 = 4.71 x 10-61

Example #1 3.0 x 4.31 = 12.93 3.0 (2 sig. figs.) 4.31 (3 sig. figs.) Round to 2 sig. figs. Final answer is 13

Example #2 7000 / 13.37 = 523.5602094 7000 (1 sig. figs.) 13.87 (4 sig. figs.) Round to 1 sig. figs. Final answer is 500

Rest of Class Work on HW: #71-82 due tomorrow and #107-132 due Friday