18th Edition

ISBN: 9781938168277

Author: William Moebs, Samuel J. Ling, Jeff Sanny

Publisher: OpenStax - Rice University

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Chapter 1, Problem 85AP

When nonmetric units we used in the United Kingdom, a unit of mass called the pound-mass (lbm) was used, where 1 lbm = 0.4539 kg. (a) If there is an uncertainty of 0.0001 kg in the pound-mass unit, what is its percent uncertainty? (b) Based on that percent uncertainty, what mass in pound-mass has an uncertainty of 1 kg when converted to kilograms?

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Chapter 1, Problem 84AP

Chapter 1, Problem 86AP

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When non-metric units were used in the United Kingdom,a unit of mass called the pound-mass (lbm) was employed,where 1 lbm = 0.4539 kg . (a) If there is an uncertainty of0.0001 kg in the pound-mass unit, what is its percentuncertainty? (b) Based on that percent uncertainty, whatmass in pound-mass has an uncertainty of 1 kg whenconverted to kilograms?

(a) How many significant figures are in the numbers 999.0 and 1000.0? 999.01000.0 (b) If the uncertainty in each number is 10, what is the percent uncertainty in each? (Give your answer to 4 significant figures.) 999.0 %1000.0 % (c) Which is a more meaningful way to express the accuracy of these two numbers, significant figures or percent uncertainties?

In each of the three cases, which measured value (mass or volume) limits the precision of the calculated density? Note that the absolute uncertainty in volume cannot be compared directly to that in the mass because the units differ (mL and g), so relative uncertainties must be considered. For volume, relative uncertainty by the rules of significant figures is ±0.01 mL / 20.10 mL = ± 0.0005, a unit-less decimal fraction. Give the relative uncertainty for each mass based on your previous answers to #s 1 & 2. Previous Answers: Balance A: 15.746 gBalance B: 15.75 gBalance C: 15.7 g What is the approximate uncertainty, or implied precision (±) of each measurement? (revise if incorrect) Balance A: ± 0.001 Balance B: ± 0.01 Balance C: ± 0.1

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