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- A measurement of the mass of a specimen was determined to be 4.203 plus or minus 0.001 g. What is the fractional uncertainty in the mass?What is the uncertainty in a measurement of 0.39 mm?A measurement of the mass of a specimen was determined to be 4.203 +- 0.001 g. What is fractional uncertainty of mass? A 0.1 B 0.01 C 0.0001 D 0.002
- 3) For the results, discuss the significance of the following in terms of accuracy or precision: a) Deviation vs Absolute Error. b) % Error vs Standard Deviation.548.8 + 0.2 x 55.4±0.6 (1142.9 ± 0.6 – 171.0±0.5) ANS: Absolute uncertainty: Percent uncertainty:Calculate the density and the uncertainty of an Al cylinder using the following data. Metal AI Mass (g) 17.7620 Length (cm) 5.18 Diameter (cm) 1.31 Assume experimentally measured quantities have uncertainties of ±1 of the most precise digit. PAI 4.0 2.55 g/cm3 + 49 g/cm3
- 1. A student wanted to find the density of an object of unknown composition with a volume of 5.50 0.05 cm³. The mass of the object was 19.255 0.005 g. What is the density of the object, including the absolute uncertainty? a. 3.500 ± 0.3 g cm³ b. 3.500 ± 0.03 g cm? c. 4.259 ± 0,6 g cm¹ d. 4,259 ± 0,06 g cm³In a certain population, body weights are normally distributed with a mean of 152 pounds and a standard deviation of 26 pounds. How many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence that the error is no more than 4 percentage points.What is the percentage uncertainty with the following measurement 0.100 ± 0.005 g? Provide your answer to one decimal point.
- 3. What is parallax and why must it be avoided when measuring liquids with a graduated cylinder and other volumetric apparatus?3. A student weighed an unknown mass directly on an electronic balance of intermediate sensitivity, and got a result of 28.774 g. The student then realized a mistake had been made, and weighed the same unknown by difference on the same balance with the following results:Mass of beaker plus unknown = 59.121 g.Mass of empty beaker = 30.346 g.When the sensitivity of the balance is taken into account, the two values obtained for the unknown mass are considered to be:a. Differentb. The SameExplain your answer.1. A graduated cylinder with a least count of ± 0.5 ml is used in a density experiment. The initial water level, before inserting the irregular shaped solid, is 30.0 ml. After inserting the solid, the water level is 34.5 ml. What is the probable error in the volume of the solid? What is the probable percent error in the volume of the solid?
