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Take 15 minutes to finish collecting data for your 2 nd page pendulum lab

Which of the measureable factors in your pendulum is most precise? Least precise? How can you tell?. Take 15 minutes to finish collecting data for your 2 nd page pendulum lab. Significance. Why do we use significant figures? Period: 1.235, 1.175, 1.443, 1.336 Avg = 1.29725. Significance.

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Take 15 minutes to finish collecting data for your 2 nd page pendulum lab

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  1. Which of the measureable factors in your pendulum is most precise? Least precise? How can you tell?

  2. Take 15 minutes to finish collecting data for your 2nd page pendulum lab

  3. Significance • Why do we use significant figures? • Period: 1.235, 1.175, 1.443, 1.336 • Avg = 1.29725

  4. Significance • Why do we use significant figures? • Period: 1.235, 1.175, 1.443, 1.336 • Avg = 1.29725 • Really?!?!? • How about 1.3

  5. Significance • Why do we use significant figures? • Period: 1.300, 1.301, 1.301, 1.301 • Avg = 1.30075 • 1.301

  6. Rules for significant figures • All non-zero numbers are significant • 2.3563 • 24456 • 84323445

  7. Rules for significant figures • All trapped zeros are significant (in between other significant numbers) • 2.30563 • 204456 • 843234405

  8. Rules for significant figures • All leading zeros are not significant • 0.00000230563 • 204456 • 0.0000843234405

  9. Rules for significant figures • zeros at the end are significant only if there is a decimal point • 2.3563000 - yes • 24456000 - no • 843234450000.0 - yes

  10. Please take out your homework. • Warm-up: • Make a guess (based on your data) how long it will take for my 3 m long pendulum to complete one period.

  11. Write down 20 different units of measure

  12. Rules for significant figures • Adding and subtracting, use the least significant digit: • 2.3546 • +1.5 • 3.8546 ->3.9 • 0.135 • +2.55489 • 2.68989 -> 2.690

  13. Rules for significant figures • Multiplying and dividing, use the least number of significant digits: • 2.3546 (5 significant digits) • +1.5 (2 significant digits) • 3.5319 ->3.5 (answer has 2) • 0.135 (3 significant digits) • +2.55489 (6 significant digits) • 0.34491015 -> 0.345 (3 significant digits)

  14. Add the following distances using correct significant figures Multiply the following distances using correct significant figures 3.45 m + 9.82 m + 13.653 m + 0.23 m (3.45 m)(9.82 m )(13.653 m )(0.23 m)

  15. Scientific Notation

  16. Scientific Notation Most numbers are really annoying

  17. Scientific Notation Most numbers are really annoying How many meters is it to the moon?

  18. Scientific Notation Most numbers are really annoying How many meters is it to the moon? 380

  19. Scientific Notation Most numbers are really annoying How many meters is it to the moon? 38000

  20. Scientific Notation Most numbers are really annoying How many meters is it to the moon? 38000000

  21. Scientific Notation Most numbers are really annoying How many meters is it to the moon? 380000000

  22. Scientific Notation Most numbers are really annoying How many meters is it to the moon? 380000000 m How big is an atom?

  23. Scientific Notation Most numbers are really annoying How many meters is it to the moon? 380000000 m How big is an atom? 0.000

  24. Scientific Notation Most numbers are really annoying How many meters is it to the moon? 380000000 m How big is an atom? 0.00000

  25. Scientific Notation Most numbers are really annoying How many meters is it to the moon? 380000000 m How big is an atom? 0.0000000

  26. Scientific Notation Most numbers are really annoying How many meters is it to the moon? 380000000 m How big is an atom? 0.0000000001 m

  27. Scientific Notation Let’s write those in a not annoying way. 380000000 m

  28. Scientific Notation Let’s write those in a not annoying way. 380000000 m x 101

  29. Scientific Notation Let’s write those in a not annoying way. 380000000 m x 102

  30. Scientific Notation Let’s write those in a not annoying way. 380000000 m x 108

  31. Scientific Notation Let’s write those in a not annoying way. 380000000 m x 108 Check our sig figs, though…

  32. Scientific Notation Let’s write those in a not annoying way. 38 m x 108 Check our sig figs, though…

  33. Scientific Notation Let’s write those in a not annoying way. 00000000001 x 100

  34. Scientific Notation Let’s write those in a not annoying way. 00000000001 x 10-10

  35. Scientific Notation Let’s write those in a not annoying way. 00000000001 x 10-10 Check our sig figs again

  36. Scientific Notation Let’s write those in a not annoying way. 1 x 10-10 Check our sig figs again

  37. Units • Length – meter – m

  38. Units • Length – meter – m • Time – second – s

  39. Units • Length – meter – m • Time – second – s • Temperature – Kelvin – K

  40. Units • Length – meter – m • Time – second – s • Temperature – Kelvin – K • Mass – kilogram – kg

  41. Units • Length – meter – m • Time – second – s • Temperature – Kelvin – K • Mass – kilogram – kg • Electric current – Ampere – A • Amount – mole – m • Luminous intensity – Lumen - L

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