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Express your answers to problems
Chapter 1, Problem 20(choose chapter or problem)
Problem 20PE
Express your answers to problems in this section to the correct number of significant figures and proper units.
(a) A person’s blood pressure is measured to be 120 ± 2 mm Hg . What is its percent uncertainty? (b) Assuming the same percent uncertainty, what is the uncertainty in a blood pressure measurement of 80 mm Hg ?
Questions & Answers
QUESTION:
Problem 20PE
Express your answers to problems in this section to the correct number of significant figures and proper units.
(a) A person’s blood pressure is measured to be 120 ± 2 mm Hg . What is its percent uncertainty? (b) Assuming the same percent uncertainty, what is the uncertainty in a blood pressure measurement of 80 mm Hg ?
ANSWER:
Solution
Step 1
a) The measured blood pressure is
The percentage of uncertainty = 100%
The percentage of uncertainty = 100%
The percentage of uncertainty =1.667 %