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STRAIGHTER LINE: GENERAL PHYSICS EXAM 1
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STRAIGHTER LINE: GENERAL PHYSICS EXAM 1
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STRAIGHTER LINE: GENERAL PHYSICS EXAM 1Which 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. - Answers-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 - Answers-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 - Answers-A
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. - Answers-A
Which of the following uses a derived SI unit measurement?
a. time
b. speed
c. distance
d. mass - Answers-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 - Answers-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. - Answers-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. - Answers-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→∣ - Answers-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. - Answers-a
In order to understand vectors, you must understand some basic trigonometry. Which of
the following correctly relates x,y,t and θ? - Answers-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→∣ - Answers-False
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
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