icvc eccy pretiseI ISmportat to specily the Questions 1. What are the merits and

Question

icvc eccy pretiseI ISmportat to specily the Questions 1. What are the merits and drawbacks of using a person's foot as a standard? Consider both (a) a particular person's foot, and (b) any person's foot. Keep in mind that it is advantageous that fundamental standards be accessible (easy to compare to), invariable (do not 4 5 change), indestructible, and reproducible. 2. What is wrong with this road sign: Memphis 7 mi (11.263 km)? 3. Why is it incorrect to think that the more digits you include in your answer, the more accurate it is? MisConceptual Questions [List all answers that are valid.] 1. A student's weight displayed on a digital scale is 117.2 lb. 6 This would suggest her weight is (a) within 1% of 117.2 lb. (b) exactly 117.2 lb. (c) somewhere between 117.18 and 117.22 lb. (d) somewhere between 117.0 and 117.4 lb. 2. Four students use different instruments to measure the length of the same pen. Which measurement implies the7 greatest precision? (a) 160.0mm. (b) 16.0 cm. (c) 0.160 m. (d) 0.00016 km. (e) Need more information. 3. The number 0,0078 has how many significant figures? 4. How many significant figures does 1.362 25.2 have? 5. Accuracy represents (a) 1 (c) 3. (a) 2. (b) 3. (c) 4. (d) 5. (a) repeatability of a measurement, using a given instrument. (b) how close a measurement is to the true value. (c) an ideal number of measurements to make. (d) how poorly an instrument is operating.

Explanation / Answer

2 a)

160.0 mm

since it uses lowest units

3.

0.0078 has "2" significant figures

4.

1.362 + 25.2

26.6

hence 3 signicant figures

5 b)

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