1 / 11

# HOMEWORK:

HOMEWORK:. Read for today: Chapter 1: all Chapter 2: sections 1-5 Read for tomorrow: Chapter 2: sections 6-8 HW #2.1: DUE WEDNESDAY Chap. 2 : 5, 7, 8, 11, 13, 33, 35, 37, 38, 39, 40, 43, 45, 47-52 (all), 97, 137, 139, 140 HW #2.2: DUE THURSDAY

## HOMEWORK:

An Image/Link below is provided (as is) to download presentation Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

### Presentation Transcript

1. HOMEWORK: • Read for today: • Chapter 1: all • Chapter 2: sections 1-5 • Read for tomorrow: • Chapter 2: sections 6-8 • HW #2.1: DUE WEDNESDAY • Chap. 2: 5, 7, 8, 11, 13, 33, 35, 37, 38, 39, 40, 43, 45, 47-52 (all), 97, 137, 139, 140 • HW #2.2: DUE THURSDAY • Chap. 2, #s 57-63 (all), 65, 67, 69, 71, 73, 79, 82, 85, 87, 89, 91, 92, 93, 95, 101, 105, 109, 143, 153

2. Uncertainty • All about uncertainty • ALL measurements have some uncertainty about 11.83 cm between 11.5 and 12 cm about 11.7 or 11.8 cm

3. Uncertainty • All about uncertainty • ALL measurements have some uncertainty

4. Uncertainty • Exact numbers: • Examples: • 1 foot = • 1 kilometer = • 1 mile = • 24 hours = • Have NO uncertainty because these numbers are DEFINED • Will never affect “significant figures”

5. Uncertainty • Counted numbers: • Examples • I have 11 fingers • there are 11 dogs • Also have no uncertainty • Will never affect “significant figures”

6. Uncertainty • Measured number • Examples • I live 6 and a half miles away • I drink 1.5 liters of water a day • This bench is… • ALWAYS have some uncertainty to them • Will always affect “significant figures”

7. Uncertainty and Measurements • State the digits you can be sure of! • Guess the next digit! (and only the next digit) I KNOW it is between 11 cm and 12 cm measurement: 11.8 cm graduations (marks): 1 cm uncertainty: ±0.1 cm

8. Uncertainty and Measurements • State the digits you can be sure of! • Guess the next digit! (and only the next digit) I KNOW it is between 11.8 cm and 11.9 cm measurement: 11.84 cm graduations (marks): 0.1 cm uncertainty: ± 0.01 cm

9. Uncertainty and Measurements • State the digits you can be sure of! • Guess the next digit! (and only the next digit) between 500 cm and 600 cm measurement: 520 cm graduations (marks): 100 cm uncertainty: ±10 cm

10. Uncertainty and Measurements The final digit in a measurement must ALWAYS be in the SAME PLACE AS, and be a MULTIPLE OF the uncertainty! If your instrument has an uncertainty of ± 0.01 mL, your measurement will end with .00 .01 .02 .03 .04 .05 .06 .07 .08 or .09 If your instrument has an uncertainty of ± 0.2 g, your measurement will end with .0 .2 .4 .6, or .8 If your instrument has an uncertainty of ± 0.005 cm, your measurement will end with .000 or .005

11. Uncertainty and Measurements Which of the following would be correct if measured on the ruler below? assume ± 0.1 cm uncertainty a) 1.0 cm b) 1.50 cm c) 1.55 cm d) 1.6 cm e) 2.00 cm

More Related