Exam 1 Concepts

# Exam 1 Concepts - Concept Test#1 If the bulls eye...

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If the “bulls eye” represents the true value, which of the following is precise but not accurate? Concept Test #1 A. Neither B. D. C. Accurate? Consider the average. Precise Accurate & Precise
Express the following product to the correct number of significant figures. (0.0340 yd) x (27.08 yd) x (3 ft/yd) 2 (The calculator gives 8.28648) Concept Test #2 A. 8 B. 8.3 D. 8.286 E. 8.2865 C. 8.29 0.0340 yd = 3 sf 27.08 yd = 4 sf 3 ft/yd = sf answer = 3 sf

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Express the following sum to the correct number of significant figures. 997.4 + 6.0321 (The calculator gives 1003.4321) Concept Test #3 A. 1003 C. 1003.43 D. 1003.432 E. 1003.4321 B. 1003.4 997.4 = 1 decimal place 6.0321 = 4 decimal places answer = 1 decimal place
Concept Test #4 Suppose we try to determine the length l of an oil plume by measuring three other lengths, l 1 , l 2 , and l 3 for which l = l 1 l 2 /l 3 . Suppose l 1 = 200 ± 2 D., l 2 = 5.5 ± 0.1 D., and l 3 =10.0 ± 0.4 D. The uncertainty in l is: (A) 1.5 D (B) 5 D (C) 18 D 5 D Hint: Error propagaNon is the same for mulNplicaNon and division: (%e 1 2 + %e 2 2 + ……) 1/2

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Confidence Intervals (The true mean and measured mean are different because we can never do enough trials to find the true mean.)
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