Agenda (CP)

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Agenda (CP)

• Check off and go over HW
• Lab Safety Quiz (open notes)
• Fire Evacuation Spot
• Start Physics Activity 1

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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

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HW Answers

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

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Agenda (ED)

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

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Scientific Notation

• 9/4/14

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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

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Scientific Notation
8
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

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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 lt 10

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Scientific Notation

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

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Scientific Notation

• 200,000,000,000 stars.
• In scientific notation is
• 2 x 1011 stars

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Scientific Notation

• 0.000000000753 kg
• In scientific notation is
• 7.53 x 10-10

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Decimal Notation

• Given 3 x 106
• Is 3000000
• Given 2.84 x 10-7
• Is 0.000000284

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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

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HW Answers

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

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Rounding Calculations

• 8/21/13

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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

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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

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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

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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.)

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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

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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

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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

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Rest of Class

• Work on HW 71-82 due tomorrow
• and 107-132 due Friday