68. Alveoli are tiny sacs of air in the lungs. Their average diameter is 5.20×10−5 m. Calculate the uncertainty in the velocity of an oxygen molecule (5.30×10−26 kg) trapped within a sac. Enter your answer in scientific notation. (Hint: The maximum uncertainty in the position of the molecule is given by the diameter of the sac.)

68. Alveoli are tiny sacs of air in the lungs. Their average diameter is 5.20×10−5 m. Calculate the uncertainty in the velocity of an oxygen molecule (5.30×10−26 kg) trapped within a sac. Enter your answer in scientific notation. (Hint: The maximum uncertainty in the position of the molecule is given by the diameter of the sac.)

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter1: Introduction: The Nature Of Science And Physics

Section: Chapter Questions

Problem 20PE: (a) A person's blood pressure is measured to be 1202 mm Hg. What is its percent uncertainty? (b)...

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(a) A person's blood pressure is measured to be 1202 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?
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A typical atom has a diameter of about 1.0×10^−10m. Approximately how many atoms are there along a 5.0 −cm−cm line? Express your answer using two significant figures.
With a caliper (Δr=0.05 mm), the edge L of a pure copper plate is measured only once. The value read by the experimenter is L=10.00 mm. It is known that the density of copper is ρ=(8.8900±0.0058)×103 kg/m3. What is the mass of the cube with its uncertainty? a) m ± um = (8.890 ± 0.078) g b) m ± um = (8.890 ± 0.078) kg c) m ± um = (8.890 ± 0.078)×10-3 g d) m ± um = (8.90 ± 0.078) g e) m ± um = (8.90 ± 0.08) g
Answer 1 to 15
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1. A student is using a track photogate to determine the time it takes her to run 50 meters. She records the following times: Trial Time (seconds) 1 5.420 5.464 3 5.728 4 5.496 5 5.644 6. 5.794 7 5.540 The data she collects has a mean of 5.583714 seconds, with an absolute uncertainty computed to be 0.141074 seconds. Report her 50-meter time as a confidence interval (а) using the mean and the absolute uncertainty given above. Another student measures his 200-meter run time (b) to be 20.7 ± 0.3 seconds. Report the relative uncertainty of each student and identify which has the more precise run time.
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Find the uncertainty in a calculated electrical potential difference from the measurements of current and resistance. Electric potential difference depends on current and resistance according to this function V(I,R) = IR. Your measured current and resistance have the following values and uncertainties I = 8.1 Amps, SI = 0.8 Amps and R = 39.7 Ohms and SR = 0.4 Ohms. What is the uncertainty in the SV?|