University Physics with Modern Physics 14th Edition By Young – Test Bank

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

1. 1)  The current definition of the standard meter of length is based on 1) A) the distance traveled by light in a vacuum.

   B) the distance between the earth and the sun.
   C) the length of a particular object kept in France.
   D) the distance between the earth’s equator and north pole.

   Answer: A

2. 2)  The current definition of the standard second of time is based on 2) A) the earth’s rotation rate.

   B) the frequency of radiation emitted by cesium atoms.
   C) the duration of one year.
   D) the oscillation of a particular pendulum kept in France.

   Answer: B

3. 3)  The current definition of the standard kilogram of mass is based on 3) A) the mass of the sun.

   B) the mass of the earth.
   C) the mass of a cesium-133 atom.
   D) the mass a particular object kept in France.

   Answer: D

4. 4)  If a woman weighs 125 lb, her mass expressed in kilograms is x kg, where x is 4) A) greater than 125. B) less than 125.

   Answer: B

5. 5)  If a tree is 15 m tall, its height expressed in feet is x ft, where x is 5) A) less than 15. B) greater than 15.

   Answer: B

6. 6)  If a flower is 6.5 cm wide, its width expressed in millimeters is x mm, where x is 6) A) less than 6.5. B) greater than 6.5.

   Answer: B

7. 7)  If an operatic aria lasts for 5.75 min, its length expressed in seconds is x s, where x is 7)

A) greater than 5.75. Answer: A

B) less than 5.75.

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8. 8)  Scientists use the metric system chiefly because it is more accurate than the English 8) system.

   A) True B) False Answer: B

9. 9)  When adding two numbers, the number of significant figures in the sum is equal to the 9) number of significant figures in the least accurate of the numbers being added.

   A) True B) False Answer: B

10. 10)  When determining the number of significant figures in a number, zeroes to the left of 10) the decimal point are never counted.

A) True B) False Answer: B

11) Which of the following is an accurate statement?

1. A)  It is possible to add a scalar quantity to a vector.
2. B)  The magnitude of a vector can be zero even though one of its components is not zero.
3. C)  The magnitude of a vector is independent of the coordinate system used.
4. D)  Even though two vectors have unequal magnitudes, it is possible that their vector

   sum is zero.

5. E)  Rotating a vector about an axis passing through the tip of the vector does not

   change the vector.

Answer: C

11)

12) If A – B = 0, then the vectors A and B have equal magnitudes and are directed in 12) the opposite directions from each other.

A) True B) False Answer: B

13) Under what condition is | A – B | = A + B? 13) A) Vectors A and B are in perpendicular directions.

B) The magnitude of vector B is zero.

C) Vectors A and B are in opposite directions.

D) Vectors A and B are in the same direction. E) The statement is never true.

Answer: C

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14) If A > B, under what condition is | A – B | = A – B? 14) A) Vectors A and B re in perpendicular directions.

B) Vectors A and B are in the same direction.

C) Vectors A and B are in opposite directions. D) The statement is never true.

E) The statement is always true. Answer: B

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.

15) For the vectors shown in the figure, express vector S in terms of vectors M 15) and N.

Answer: S =M -N
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

16. 16)  The magnitude of a vector can never be less than the magnitude of one of its 16) components.

    A) True B) False Answer: A

17. 17)  If the magnitude of vector A is less than the magnitude of vector B , then the x 17) component of A is less than the x component of B .

A) True Answer: B

B) False

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18) If the eastward component of vector A is equal to the westward component of vector 18) B and their northward components are equal. Which one of the following statements

about these two vectors is correct?
A) Vector A is perpendicular to vector B .

B) Vector A is parallel to vector B .
C) Vectors A and B point in opposite directions.
D) The magnitude of vector A is equal to the magnitude of vector B .

E) The magnitude of vector A is twice the magnitude of vector B . Answer: D

19) If all the components of a vector are equal to 1, then that vector is a unit vector. 19) A) True B) False

Answer: B

20) If the dot product of two nonzero vectors is zero, the vectors must be perpendicular to 20) each other.

A) True B) False Answer: A

21) If two nonzero vectors point in the same direction, their dot product must be zero. 21) A) True B) False

Answer: B

22) The value of the dot product of two vectors depends on the particular coordinate 22) system being used.

A) True B) False Answer: B

23) If two vectors are perpendicular to each other, their cross product must be zero. 23) A) True B) False

Answer: B

24) If two vectors point in opposite directions, their cross product must be zero. 24) A) True B) False

Answer: A
25) If A and B are nonzero vectors for which A · B = 0, it must follow that 25)

A)|A × B | = 1.

C) | A × B | = AB. Answer: C

B) A is parallel to B . D) A × B = 0.

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