2. Mass Measurements (procedure) The mass of three metal rounds is measured, one at a time, in grams and oz on analytical balance, and data entered in the appropriate column in Table 2. First, one of the metal rounds is placed on analytical balance, set on gram (g) unit, and data observed and recorded to the nearest hundredths of a gram on the Data Table 2, first row, second column. Then, the unit on the balance is switched to ounce (oz) scale and the mass of the same metal round is measured in oz and the data is entered first row, third column. The same procedure of measuring the mass in gram and oz continues for the second and third metal rounds, and data entered in their respective second and third rows and columns. Assignment From the theoretical mass in gram and oz measurement data in the second and third columns, calculate the ratio of mass in the units of the two measurement systems, by dividing the mass gram to the mass in ounce, in each row and enter the value in the last column (ratio g/oz). The mean of the ratios (observed mean), which should be near the standard value (28.35 g/oz) is calculated by adding the ratios in the three replications and dividing it by three. The percent error of your measurements is calculated using the following formula. % Error = */Standard value – observed mean/ x 100 Standard value Table 2. Mass Measurements Replicate #1 #2 #3 Mass (g) *absolute difference (no negative sign) 50 80 100 Mass (oz.) 1.46 2.74 3.11 Mean % Error Ratio (g/oz) 3. Length Measurements The lengths of three woodblocks is measured one at a time, in centimeters and inches, and measurement values are recorded in the respective row and column in the Data Table 3. Then the ratios of the lengths in centimeters to inches is calculated by dividing cm values in the second column to the inch values in the third column, and values entered in the last ratio (cm/in) column. The mean of the three ratios, which should be near the standard (2.54 cm/inch), is determined. Finally, the percent error of the measurements is calculated using the formulae given below. % Error = */Standard value – observed mean/ x 100 Standard value *absolute difference (no negative sign)
2. Mass Measurements (procedure) The mass of three metal rounds is measured, one at a time, in grams and oz on analytical balance, and data entered in the appropriate column in Table 2. First, one of the metal rounds is placed on analytical balance, set on gram (g) unit, and data observed and recorded to the nearest hundredths of a gram on the Data Table 2, first row, second column. Then, the unit on the balance is switched to ounce (oz) scale and the mass of the same metal round is measured in oz and the data is entered first row, third column. The same procedure of measuring the mass in gram and oz continues for the second and third metal rounds, and data entered in their respective second and third rows and columns. Assignment From the theoretical mass in gram and oz measurement data in the second and third columns, calculate the ratio of mass in the units of the two measurement systems, by dividing the mass gram to the mass in ounce, in each row and enter the value in the last column (ratio g/oz). The mean of the ratios (observed mean), which should be near the standard value (28.35 g/oz) is calculated by adding the ratios in the three replications and dividing it by three. The percent error of your measurements is calculated using the following formula. % Error = */Standard value – observed mean/ x 100 Standard value Table 2. Mass Measurements Replicate #1 #2 #3 Mass (g) *absolute difference (no negative sign) 50 80 100 Mass (oz.) 1.46 2.74 3.11 Mean % Error Ratio (g/oz) 3. Length Measurements The lengths of three woodblocks is measured one at a time, in centimeters and inches, and measurement values are recorded in the respective row and column in the Data Table 3. Then the ratios of the lengths in centimeters to inches is calculated by dividing cm values in the second column to the inch values in the third column, and values entered in the last ratio (cm/in) column. The mean of the three ratios, which should be near the standard (2.54 cm/inch), is determined. Finally, the percent error of the measurements is calculated using the formulae given below. % Error = */Standard value – observed mean/ x 100 Standard value *absolute difference (no negative sign)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Transcribed Image Text:2. Mass Measurements (procedure)
The mass of three metal rounds is measured, one at a time, in grams and oz on
analytical balance, and data entered in the appropriate column in Table 2. First,
one of the metal rounds is placed on analytical balance, set on gram (g) unit, and
data observed and recorded to the nearest hundredths of a gram on the Data Table
2, first row, second column. Then, the unit on the balance is switched to ounce
(oz) scale and the mass of the same metal round is measured in oz and the data is
entered first row, third column. The same procedure of measuring the mass in
gram and oz continues for the second and third metal rounds, and data entered in
their respective second and third rows and columns.
Assignment
From the theoretical mass in gram and oz measurement data in the second and
third columns, calculate the ratio of mass in the units of the two measurement
systems, by dividing the mass gram to the mass in ounce, in each row and enter
the value in the last column (ratio g/oz). The mean of the ratios (observed
mean), which should be near the standard value (28.35 g/oz) is calculated by
adding the ratios in the three replications and dividing it by three. The percent
error of your measurements is calculated using the following formula.
% Error = */Standard value – observed mean/ x 100
Standard value
Table 2. Mass Measurements
*absolute difference (no negative sign)
Replicate
Mass (g)
#1
H
#2
#3
3.
50
80
100
Mass (oz.)
1.46
2.74
3.11
Length Measurements
The lengths of three woodblocks is measured one at a time, in centimeters and
inches, and measurement values are recorded in the respective row and column in
the Data Table 3. Then the ratios of the lengths in centimeters to inches is
calculated by dividing cm values in the second column to the inch values in the
third column, and values entered in the last ratio (cm/in) column. The mean of
the three ratios, which should be near the standard (2.54 cm/inch), is
determined. Finally, the percent error of the measurements is calculated using
the formulae given below.
Table 3. Length Measurements
Blocks
#1
Mean
% Error
% Error = */Standard value – observed mean/ x 100
Standard value
Length (cm)
7.6
*absolute difference (no negative sign)
Length (in)
Ratio (g/oz)
3.0
Ratio (cm/in)
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