Chapter 1 Units, Physical Quantities, and Vectors

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

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

11)
Which of the following is an accurate statement?
A)
The magnitude of a vector can be zero even though one of its components is not
zero.
B)
It is possible to add a scalar quantity to a vector.
C)
Even though two vectors have unequal magnitudes, it is possible that their
vector sum is zero.
D)
Rotating a vector about an axis passing through the tip of the vector does not
change the vector.
E)
The magnitude of a vector is independent of the coordinate system used.

12)
If .jpg”> -.jpg”>= 0,
then the vectors.jpg”> and.jpg”>have
equal magnitudes and are directed in the opposite directions from each other.
A)
True
B)
False

13)
Under what condition is |.jpg”> -.jpg”>| = A
+ B?
A)
The magnitude of vector.jpg”>is
zero.
B)
Vectors.jpg”> and.jpg”>are
in opposite directions.
C)
Vectors.jpg”> and.jpg”>are
in the same direction.
D)
Vectors.jpg”> and.jpg”>are in perpendicular directions.
E)
The statement is never true.

14)
If A > B, under what condition is |.jpg”> -.jpg”> | = A- B?
A)
The statement is never true.
B)
Vectors.jpg”> and.jpg”>are
in opposite directions.
C)
Vectors.jpg”> and.jpg”>are
in the same direction.
D)
Vectors .jpg”> and.jpg”>are in perpendicular directions.
E)
The statement is always true.

15)
For the vectors shown in the figure, express vector.jpg”> in terms of vectors.jpg”> and.jpg”>.
.jpg”>

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