PHYS 165: PHYSICS LATEST
MODULE 1EXAM
What term refers to the agreement of several measurements to each
other? - ANSWERS-precision
What is the best practice when making measurements in science?
a. Be accurate with those measurements
b. Be precise with those measurements
c. Both A and B
d. Neither A nor B - ANSWERS-c. Both A and B
Besides factors that are unique to the situation, the factors contributing
to uncertainty in a measurement include:
a. Limitations of the measuring device
b. The skill of the person making the measurement
c. Both A and B
d. Neither A nor B - ANSWERS-c. Both A and B
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PAGE
1
, PHYS 165: PHYSICS LATEST
MODULE 1EXAM
The length of a board is reported as 150 ± 5 cm. If you were to measure
this board, what is the largest possible value that you could expect the
get? What is the smallest? - ANSWERS-Largest - 150 cm + 5 cm = 155
cm
Smallest - 150 cm - 5 cm = 145 cm
The mass of a block of wood is reported as 275 ± 11 cm. What is the
percent uncertainty? - ANSWERS-4%
The time for a drag race is 75.5 s ± 8%. What is the absolute
uncertainty? - ANSWERS-(0.8) (75.5 s) = 6.0 s
The length of a table is reported as 125 ± 0.5 cm. What is the percent
uncertainty? - ANSWERS-0.4%
The mass of a bag of flour is 2.35 kg ± 6%. What is the absolute
uncertainty? - ANSWERS-(0.06) (2.35 kg) = 0.14 kg
You go to the hardware store and purchase five 2 X 4 X 8 pieces of
wood. A 2 X 4 X 8 is 2 inches wide, 4 inches high, and 8 feet long. You
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PAGE
2
, PHYS 165: PHYSICS LATEST
MODULE 1EXAM
measure the length of each of the pieces of wood and obtain the
following measurements: 8.02 feet, 7.96 feet, 7.98 feet, 8.07 feet, and
7.92 feet. Determine the absolute uncertainty and the percent
uncertainty.
Average length? - ANSWERS-7.99 feet
You go to the hardware store and purchase five 2 X 4 X 8 pieces of
wood. A 2 X 4 X 8 is 2 inches wide, 4 inches high, and 8 feet long. You
measure the length of each of the pieces of wood and obtain the
following measurements: 8.02 feet, 7.96 feet, 7.98 feet, 8.07 feet, and
7.92 feet. Determine the absolute uncertainty and the percent
uncertainty.
Absolute uncertainty? - ANSWERS-Absolute uncertainty = 8.07 feet -
7.99 feet = 0.08 feet
You go to the hardware store and purchase five 2 X 4 X 8 pieces of
wood. A 2 X 4 X 8 is 2 inches wide, 4 inches high, and 8 feet long. You
measure the length of each of the pieces of wood and obtain the
following measurements: 8.02 feet, 7.96 feet, 7.98 feet, 8.07 feet, and
END OF
PAGE
3
MODULE 1EXAM
What term refers to the agreement of several measurements to each
other? - ANSWERS-precision
What is the best practice when making measurements in science?
a. Be accurate with those measurements
b. Be precise with those measurements
c. Both A and B
d. Neither A nor B - ANSWERS-c. Both A and B
Besides factors that are unique to the situation, the factors contributing
to uncertainty in a measurement include:
a. Limitations of the measuring device
b. The skill of the person making the measurement
c. Both A and B
d. Neither A nor B - ANSWERS-c. Both A and B
END OF
PAGE
1
, PHYS 165: PHYSICS LATEST
MODULE 1EXAM
The length of a board is reported as 150 ± 5 cm. If you were to measure
this board, what is the largest possible value that you could expect the
get? What is the smallest? - ANSWERS-Largest - 150 cm + 5 cm = 155
cm
Smallest - 150 cm - 5 cm = 145 cm
The mass of a block of wood is reported as 275 ± 11 cm. What is the
percent uncertainty? - ANSWERS-4%
The time for a drag race is 75.5 s ± 8%. What is the absolute
uncertainty? - ANSWERS-(0.8) (75.5 s) = 6.0 s
The length of a table is reported as 125 ± 0.5 cm. What is the percent
uncertainty? - ANSWERS-0.4%
The mass of a bag of flour is 2.35 kg ± 6%. What is the absolute
uncertainty? - ANSWERS-(0.06) (2.35 kg) = 0.14 kg
You go to the hardware store and purchase five 2 X 4 X 8 pieces of
wood. A 2 X 4 X 8 is 2 inches wide, 4 inches high, and 8 feet long. You
END OF
PAGE
2
, PHYS 165: PHYSICS LATEST
MODULE 1EXAM
measure the length of each of the pieces of wood and obtain the
following measurements: 8.02 feet, 7.96 feet, 7.98 feet, 8.07 feet, and
7.92 feet. Determine the absolute uncertainty and the percent
uncertainty.
Average length? - ANSWERS-7.99 feet
You go to the hardware store and purchase five 2 X 4 X 8 pieces of
wood. A 2 X 4 X 8 is 2 inches wide, 4 inches high, and 8 feet long. You
measure the length of each of the pieces of wood and obtain the
following measurements: 8.02 feet, 7.96 feet, 7.98 feet, 8.07 feet, and
7.92 feet. Determine the absolute uncertainty and the percent
uncertainty.
Absolute uncertainty? - ANSWERS-Absolute uncertainty = 8.07 feet -
7.99 feet = 0.08 feet
You go to the hardware store and purchase five 2 X 4 X 8 pieces of
wood. A 2 X 4 X 8 is 2 inches wide, 4 inches high, and 8 feet long. You
measure the length of each of the pieces of wood and obtain the
following measurements: 8.02 feet, 7.96 feet, 7.98 feet, 8.07 feet, and
END OF
PAGE
3
