Sample Final questions for PS 150
1)
Which of the following is an accurate statement?
A) Rotating a vector about an axis passing through the tip of the vector does not change the
vector.
B) The magnitude of a vector can be zero even though one of its components is not zero.
C) The magnitude of a vector is independent of the orientation of the coordinate system used.
D) It is possible to add a scalar quantity to a vector.
E) Even though two vectors have unequal magnitudes, it is possible that their vector sum is
zero.
2)
Two vectors are given as follows:
ˆ
ˆ
ˆ
3
2
2
A
i
j
k
±
±
r
and
ˆ
ˆ
ˆ
2
5
2
B
i
j
k
±
±
²
r
.
The scalar
product
A B
r
r
is closest to
A)
20
B)
12
C)
zero
D)
8
E)
12
3)
A ball is projected upward at time t = 0.0 s, from a point on a roof 30 m above the ground.
The ball rises, then falls and strikes the ground. The initial velocity of the ball is 32.5 m/s.
Consider all quantities as positive in the upward direction. At time t = 2.1 s, the
acceleration
of
the ball is closest to:
A)
5 m/
B)
10 m/
C)
zero
D)
+10 m/
E)
+5 m/
4)
A test rocket is fired straight up from rest with a net acceleration of 20 m/s
2
. After 4 seconds
the motor turns off, but the rocket continues to coast upward. What
maximum elevation
does
the rocket reach?
5)
A package is dropped from an airplane traveling horizontally at constant speed. Friction is
negligible. One second later a second package is dropped. Which of the following is an accurate
statement?
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 Spring '01
 L.khazan
 Physics, pH, Force, m/s, geosynchronous satellite, roton, 3 1011 J

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