Straighter line: General Physics I
Questions and All Correct Answers.
Which of the following statements related to conversion factors is false?
A. A conversion factor is the ratio of the given unit to the required unit.
B. A conversion factor does not necessarily convert to standard SI units.
C. The expression 60 min / hour is an example of a conversion factor.
D. The value of a conversion factor is essentially 1. - Answer A
What are SI units?
A. Standard Index units of measurement
B. Units from the old English measurement system
C. International time units
D. Systeme International units of measurement - Answer D
An SI unit is a Systeme Internacionale unit. In most cases, an SI unit is an mks unit or is derived
from mks units.
Suppose you are told that 15 quarts (qt) = 14.2 liters (L). What is the conversion factor you
would use to convert from quarts to liters? What is the conversion factor you would you use to
convert liters to quarts?
A. quarts to liters: 14.2 L / 15 qtliters to quarts: 15 qt / 14.2 L
B. quarts to liters:15 qt + 14.2 Lliters to quarts: 29.2 qt / L
C. quarts to liters: 15 qt / 14.2 Lliters to quarts: 1.06 qt / L
D. quarts to liters: 15 qt • 14.2 Lliters to quarts: 213 qt / L - Answer A
Suppose you have $100 that you need to convert to Danish kroner. The conversion rate that day
is 5.732 Danish kroner for one American dollar. The business that converts your money charges
you a flat fee of 50 Danish kroner for the transaction. Use your knowledge of significant figures
to decide which of the following shows the correct amount of Danish kroner that you should
receive.
A. 573.2 Danish kroner
B. 500 Danish kroner
C. 523.2 Danish kroner
D. 573 Danish kroner - Answer C
The number that determines the number of significant figures is the conversion factor: 1
American dollar per 5.732 Danish kroner. There are four significant figures in 5.732. You assume
,that the 100 and the 50 are precise figures, and therefore not considered when determining the
number of significant figures.
Suppose you are asked to determine the perimeter of a seven-sided irregular figure. You make
the following measurements:Side 1 = 3.2 mSide 2 = 4.8 mSide 3 = 2.000 mSide 4 = 8.94 mSide 5
= 11 mSide 6 = 7.566 mSide 7 = 4.0 m How many significant figures should there be in your
calculation for the perimeter?
a. one significant figure
b. two significant figures
c. three significant figures
d. four significant figures - Answer B
The adding rule states that when adding numbers you should use the number of decimal places
from the number that has the fewest decimal place digits. In this case, that number is 11, which
has no digits after the decimal point. The sum of the sides is 36.9, which should be rounded to
40., where the zero is a significant digit.
An object travels a distance d with acceleration (a) over a period of time (t) according to the
equation:
d=(1/2) at^2. After 2.3 seconds with an acceleration of 9.8 m/s, how far does an object travel?
a. d=(1/2)at^2=(1/2)(9.8m/s^2)(2.3s)^2= 26m
b. d=(1/2)at^2=(1/2)(9.8m/s^2)(2.3s)^2= 11m
c. (1/2)at^2=(1/2)(9.8m/s^2)(2.3s)^2 = 26m/s
d. None of the above. - Answer A
Which of the following uses a derived SI unit measurement?
a. time
b. speed
c. distance
d. mass - Answer b
The circumference of a circle is defined by the equation C=2πr, where π=3.14. Suppose that r =
0.0347 m.
Which of the following correctly shows the circumference of the circle?
a. C = 0.378 m2
b. C = 0.237916 m
c. C = 0.2 m
d. C = 0.218 m - Answer d
, Which of the following statements about SI distance units is not correct?
a. Both a meter and a kilometer are SI units.
b. A mile is not an SI unit.
c. A meter currently has a universal unit definition.
d. Converting a meter to feet is an example of a conversion involving two different SI units for
distance. - Answer d
Which of the following does not explain the use of SI units in physics?
a. SI units have been universally accepted as the standard by the scientific community.
b. SI units are more difficult to manipulate than old English system units (such as the foot and
the pound).
c. Physicists are able to measure complicated quantities using mks units.
d. SI units are arbitrarily defined. - Answer B
Vectors A→ ,B→ and C--> are shown in the figure. Which of the following is correct?
a. C→=A→−B→
b. C→=B→−A→
c. C→=A→+B→
d. C→=∣A→∣+∣B→∣ - Answer a
If C→=A→+B→ then the magnitude of C→ or ∣C→∣, is the sum of the magnitudes of A→ and B→
or A→+B→,
a. When A and B are in the same direction.
b. When A and B are in the opposite direction.
c. under no circumstances.
d. Answers A and B. - Answer a
In order to understand vectors, you must understand some basic trigonometry. Which of the
following correctly relates x,y,t and θ? - Answer c. x=t cos 0; y=t sin 0 tan0= y/x;t= sq
(x^2+y^2)
If C→=A→+B→, then the magnitude of C→, or ∣C→∣, is the sum of the magnitudes of A→ and
B→, or ∣A→∣+∣B→∣ - Answer False
Which of the following quantities is not a vector?
Questions and All Correct Answers.
Which of the following statements related to conversion factors is false?
A. A conversion factor is the ratio of the given unit to the required unit.
B. A conversion factor does not necessarily convert to standard SI units.
C. The expression 60 min / hour is an example of a conversion factor.
D. The value of a conversion factor is essentially 1. - Answer A
What are SI units?
A. Standard Index units of measurement
B. Units from the old English measurement system
C. International time units
D. Systeme International units of measurement - Answer D
An SI unit is a Systeme Internacionale unit. In most cases, an SI unit is an mks unit or is derived
from mks units.
Suppose you are told that 15 quarts (qt) = 14.2 liters (L). What is the conversion factor you
would use to convert from quarts to liters? What is the conversion factor you would you use to
convert liters to quarts?
A. quarts to liters: 14.2 L / 15 qtliters to quarts: 15 qt / 14.2 L
B. quarts to liters:15 qt + 14.2 Lliters to quarts: 29.2 qt / L
C. quarts to liters: 15 qt / 14.2 Lliters to quarts: 1.06 qt / L
D. quarts to liters: 15 qt • 14.2 Lliters to quarts: 213 qt / L - Answer A
Suppose you have $100 that you need to convert to Danish kroner. The conversion rate that day
is 5.732 Danish kroner for one American dollar. The business that converts your money charges
you a flat fee of 50 Danish kroner for the transaction. Use your knowledge of significant figures
to decide which of the following shows the correct amount of Danish kroner that you should
receive.
A. 573.2 Danish kroner
B. 500 Danish kroner
C. 523.2 Danish kroner
D. 573 Danish kroner - Answer C
The number that determines the number of significant figures is the conversion factor: 1
American dollar per 5.732 Danish kroner. There are four significant figures in 5.732. You assume
,that the 100 and the 50 are precise figures, and therefore not considered when determining the
number of significant figures.
Suppose you are asked to determine the perimeter of a seven-sided irregular figure. You make
the following measurements:Side 1 = 3.2 mSide 2 = 4.8 mSide 3 = 2.000 mSide 4 = 8.94 mSide 5
= 11 mSide 6 = 7.566 mSide 7 = 4.0 m How many significant figures should there be in your
calculation for the perimeter?
a. one significant figure
b. two significant figures
c. three significant figures
d. four significant figures - Answer B
The adding rule states that when adding numbers you should use the number of decimal places
from the number that has the fewest decimal place digits. In this case, that number is 11, which
has no digits after the decimal point. The sum of the sides is 36.9, which should be rounded to
40., where the zero is a significant digit.
An object travels a distance d with acceleration (a) over a period of time (t) according to the
equation:
d=(1/2) at^2. After 2.3 seconds with an acceleration of 9.8 m/s, how far does an object travel?
a. d=(1/2)at^2=(1/2)(9.8m/s^2)(2.3s)^2= 26m
b. d=(1/2)at^2=(1/2)(9.8m/s^2)(2.3s)^2= 11m
c. (1/2)at^2=(1/2)(9.8m/s^2)(2.3s)^2 = 26m/s
d. None of the above. - Answer A
Which of the following uses a derived SI unit measurement?
a. time
b. speed
c. distance
d. mass - Answer b
The circumference of a circle is defined by the equation C=2πr, where π=3.14. Suppose that r =
0.0347 m.
Which of the following correctly shows the circumference of the circle?
a. C = 0.378 m2
b. C = 0.237916 m
c. C = 0.2 m
d. C = 0.218 m - Answer d
, Which of the following statements about SI distance units is not correct?
a. Both a meter and a kilometer are SI units.
b. A mile is not an SI unit.
c. A meter currently has a universal unit definition.
d. Converting a meter to feet is an example of a conversion involving two different SI units for
distance. - Answer d
Which of the following does not explain the use of SI units in physics?
a. SI units have been universally accepted as the standard by the scientific community.
b. SI units are more difficult to manipulate than old English system units (such as the foot and
the pound).
c. Physicists are able to measure complicated quantities using mks units.
d. SI units are arbitrarily defined. - Answer B
Vectors A→ ,B→ and C--> are shown in the figure. Which of the following is correct?
a. C→=A→−B→
b. C→=B→−A→
c. C→=A→+B→
d. C→=∣A→∣+∣B→∣ - Answer a
If C→=A→+B→ then the magnitude of C→ or ∣C→∣, is the sum of the magnitudes of A→ and B→
or A→+B→,
a. When A and B are in the same direction.
b. When A and B are in the opposite direction.
c. under no circumstances.
d. Answers A and B. - Answer a
In order to understand vectors, you must understand some basic trigonometry. Which of the
following correctly relates x,y,t and θ? - Answer c. x=t cos 0; y=t sin 0 tan0= y/x;t= sq
(x^2+y^2)
If C→=A→+B→, then the magnitude of C→, or ∣C→∣, is the sum of the magnitudes of A→ and
B→, or ∣A→∣+∣B→∣ - Answer False
Which of the following quantities is not a vector?
