aragraph Styles 7. Several groups of student s are attempting to determine the d
ID: 286503 • Letter: A
Question
aragraph Styles 7. Several groups of student s are attempting to determine the density of a lead weight by various methods. The data collected by each of the groups are indicated below. Measured density in g/cm Group Trial 1 12.7 11.5 10.9 Trial 2 11.2 11.4 11.3 Trial 3 10.3 11.4 11.1 Average 11.40 11.43 11.10 A handbook lists the density of lead as 11.3 g/cm. a. Which of the group's data are the most accurate? b. Which of the group's data are the most precise? Look up the conversion rule[s) and carry out the conversion showing your work. Conversion Rules centimeters (cm) to meters (m) 21.5 cm to m 10-2m 1 em 21.5cm × 0.215 liters (l) to quarts (qt.) 3.4 qt. tol pounds (lb) to kilograms (kg) 175(Qto miles (mi) to kilometer (km) eigabyte (Ge) to byte,120 GB to kB kilobyte (kB) to byteExplanation / Answer
Answer :-
7. (a) Accuracy refers to the closeness of a measured value to standard or known value . Here standard value of density of lead is 11.3 g/cm3 . If we look at the data the group 1 average value i.e 11.40 g/cm3 is very close to the standard value . Therefore group 1 data is most accurate.
(b) Precision descibes the variation when you measure the same part repeatedly with the same device. Here group 2 data (11.5, 11.4,11.4) are more close to the standard value (11.3 g/cm3) . Therefore group 2 data is most precise.
8. (2) Since, 1 quart = 0.946 litre
3.4 quart = 3.4 * 0.946 = 3.2164 litre
(3) Since , 1 pound = 0.453592 kg
175 pound = 79.3786 kg
(4) Since , 1 mile = 1.60934 km
55 mi/h = 55 * 1.60934 = 88.5137 km/h
(5) Since , 1 GB = 1073741824 byte and 1 KB = 1024 byte.
120 GB = ( 120 * 1073741824 ) / 1024 = 125829120 KB
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